Articoli di riviste: "Xujiahui"

1

Miao, Huicui, e Feng Zhao. "Analysis on the Types of Lace and Drawnwork Introduced to Shanghai". Asian Social Science 18, n. 3 (28 febbraio 2022): 8. http://dx.doi.org/10.5539/ass.v18n3p8.

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Shanghai was an important lace export port in the early 20th century. Due to the lack of documentation, the historical research on the introduction of lace technology centered on Xujiahui Notre Dame is still not exhaustive. This article uses the latest collected literature as a supplement to verify and analyze the construction of the lace workshop of Notre Dame in Xujiahui, Shanghai. Based on the technical principles in the lace system, the time and variety of lace and drawnwork technology in the Shanghai area have been combed and researched, found that the varieties in the Shanghai area are relatively rich, of which the technical traditions of Needle lace and Crochet have been formed very early. As a famous lace variety in Shanghai, the introduction time of Filet lace is not synchronized with the first two.

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van den Berg, Marinus. "Modernization and the restructuring of the Shanghai speech community". Restructuring Chinese Speech Communities 26, n. 1 (9 giugno 2016): 112–42. http://dx.doi.org/10.1075/japc.26.1.05van.

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This paper reports the results of direct observations of language use in two shopping areas in Shanghai, Nanjing East Road and Xujiahui. The data reported in this paper were collected in 2007. In Nanjing East Road, four traditional stores provided a base line for the use of Shanghainese. That base line (60 percent) was compared to a hierarchy of department stores in Xujiahui. The results showed that the store that best matched the base-line data attracted customers representing upper-working class / lower middle class customers. The remaining two stores attracted middle class and upper class customers. In the latter setting, it was found that a certain segment of the customers switched from Shanghainese to Putonghua for the business transaction, an effect we associated with the presence of young urban professionals of all backgrounds. The implications of these findings are discussed in the context of speech community theory, and network density, which allows predictions of changes taking place within the dominant language of the Shanghainese speech community.

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De Caro, Antonio. "Converting Zi-ka-wei: Angelo A. Zottoli, S.J. (Chao Deli 晁德蒞, 1826–1902) and His Mission in Shanghai". Journal of Jesuit Studies 10, n. 4 (10 agosto 2023): 640–53. http://dx.doi.org/10.1163/22141332-10040006.

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Abstract When the Jesuits returned to China in the nineteenth century, the mission and surrounding community at Xujiahui (Zikawei), near Shanghai, was an important intellectual and administrative center. Among the foreign Jesuits present at Xujiahui, a fixture for many years, was the Italian Angelo Zottoli, an educator, administrator, and translator for the mission. From his arrival in Shanghai in 1848 until he died in 1902, Zottoli was an essential figure in the cross-cultural dialogue between Chinese Catholics and foreign missionaries. Though far from a firebrand, Zottoli greatly admired Chinese culture and generally took an “accommodationist” approach, which clashed with the attitudes of other Jesuits in Shanghai. At the same time, he supported papal pronouncements on Chinese Rites, which provided strict limits to accommodation. Overall, then, he represents the difficulties Jesuits faced in reconciling the history of the church in China and their own attitudes (such as Eurocentricity) with Chinese culture. This article is part of the special issue of the Journal of Jesuit Studies, “Jesuits in Modern Far East,” guest edited by Steven Pieragastini.

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Cui, Jianqiang, Andrew Allan, Michael A. P. Taylor e Dong Lin. "DEVELOPING SHANGHAI UNDERGROUND PEDESTRIAN SYSTEM UNDER URBANIZATION: MOBILITY, FUNCTIONALITY AND EQUITY". JOURNAL OF ARCHITECTURE AND URBANISM 36, n. 4 (2 gennaio 2013): 283–97. http://dx.doi.org/10.3846/20297955.2012.752933.

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Shanghai is being transformed through a process of rapid urbanization. Urbanization has the effects of increasing urban population and the income levels of residents as well as changing the structure of transportation. Under the background, from the 1980s, Shanghai has increasingly built and extended underground pedestrian systems (UPS) within central areas to complement pedestrian networks. UPS have significantly affected urban life in Shanghai under the decades of development but to date, research on UPS usage and perceptions of UPS users has been lacking. This research conducted an on-the-spot survey in Shanghai's UPS in People's Square, Jing'an Temple and Xujiahui areas. Investigation through observation, face to face questionnaires and interviews generated qualitative and quantitative findings on the usage characteristics and perceptions of UPS users. The discussion focused on social usage and equity and the functionality of UPS. It revealed defects in the design and management of Shanghai's UPS, including deficiencies with regard to consideration of the elderly, disabled groups, management of homeless people, the range of merchandise categories and orientation (i.e. way-finding) systems. This research is a significant contribution to enriching knowledge and providing insights into the performance of UPS in a developing country under rapid urbanization.

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Wu, Zihan, Xiang Ji, Xi Zhou e Shuai Tong. "Research on Environmental Suitability Evaluation of the Transfer Spaces in Urban Subway Stations". Buildings 12, n. 12 (13 dicembre 2022): 2209. http://dx.doi.org/10.3390/buildings12122209.

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The transfer space realizes the connectivity of subway intersections. Passengers generally express that they have a poor experience in the use of this space, so improving the environmental suitability of transfer spaces at subway stations is a top priority. Based on a literature review and field research, this study established an environmental suitability evaluation system for transfer spaces and used the fuzzy comprehensive evaluation method to evaluate the environmental suitability of eight samples in Shanghai. The results showed that the evaluation results of the eight samples were ranked as follows: Hanzhong Road Station > People’s Square Station > East Nanjing Road Station > Century Avenue Station > Xujiahui Station > Laoximen Station > Jiangsu Road Station > Shanghai Railway Station. Through the analysis of the relationship between the indicators, it was found that the environmental suitability of a transfer space is greatly affected by safety and convenience, while practicality, comfort, and aesthetics were found to have a weak influence on the suitability of transfer spaces. These evaluation methods and results provide a reference for the improvement of the environmental quality of subway transfer spaces in other cities.

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Yan, Liu, Cao Tong e Lou Yuxia. "Effect of environmental change on species diversity of bryophytes: a case study in Xujiahui (Zi ka Wei) area, Shanghai". Biodiversity Science 16, n. 2 (2008): 181. http://dx.doi.org/10.3724/sp.j.1003.2008.07366.

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7

Wang, Wenxuan, Xiaodong Zhu, Yanli Wang e Bing Wu. "Route Identification Method for On-Ramp Traffic at Adjacent Intersections of Expressway Entrance". Journal of Advanced Transportation 2019 (4 dicembre 2019): 1–15. http://dx.doi.org/10.1155/2019/6960193.

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To determine the control strategy at intersections adjacent to the expressway on-ramp, a route identification method based on empirical mode decomposition (EMD) and dynamic time warping (DTW) is established. First, the de-noise function of EMD method is applied to eliminate disturbances and extract features and trends of traffic data. Then, DTW is used to measure the similarity of traffic volume time series between intersection approaches and expressway on-ramp. Next, a three-dimensional feature vector is built for every intersection approach traffic flow, including DTW distance, space distance between on-ramp and intersection approach, and intersection traffic volume. Fuzzy C-means clustering method is employed to cluster intersection approaches into classifications and identify critical routes carrying the most traffic to the on-ramp. The traffic data are collected by inductive loops at Xujiahui on-ramp of North and South Viaduct Expressway and surrounding intersections in Shanghai, China. The result shows that the proposed method can achieve route classification among intersections for different time periods in one day, and the clustering result is significantly influenced by three dimensions of traffic flow feature vector. As an illustrative example, micro-simulation models are built with different control strategies. The simulation shows that the coordinated control of critical routes identified by the proposed method has a better performance than coordinated control of arterial roads. Conclusions demonstrated that the proposed route identification method could provide a theoretical basis for the coordinated control of traffic signals among intersections and on-ramp.

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Zhang, Suqin, Changhua Fu, Jianjun Wang, Guohao Zhu, Chuanhua Chen, Shaopeng He, Pengkun Guo e Guoping Chang. "Rescue and quality control of historical geomagnetic measurement at Sheshan observatory, China". Earth System Science Data 14, n. 11 (24 novembre 2022): 5195–212. http://dx.doi.org/10.5194/essd-14-5195-2022.

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Abstract. The Sheshan Geomagnetic Observatory (International Association of Geomagnetism and Aeronomy (IAGA) code SSH), China was built in Xujiahui, Shanghai in 1874 and moved to Sheshan, Shanghai at the end of 1932. So far, the SSH has a history of nearly 150 years. It is one of the earliest geomagnetic observatories in China and one of the geomagnetic observatories with the longest history in the world. In this paper, we present the rescue and quality control (QC) of the historical data at the SSH from 1933 to 2019. The rescued data are the absolute hourly mean values (AHMVs) of declination (D), horizontal (H), and vertical (Z) components. Some of these data are paper-based records and some are stored in a floppy disk in BAS, DBF, MDB, and other file storage formats. After digitization and format transformation, we imported the data into the Toad database to achieve the unified data management. We performed statistics of completeness, visual analysis, outliers detects, and data correction on the stored data. We then conducted the consistency test of daily variation and secular variation (SV) by comparing the corrected data with the data of the reference observatory, and the computational data of the COV-OBS model, respectively. The consistency test reveals good agreement. However, the individual data should be used with caution because these data are suspicious values, but there is not any explanation or change registered in the available metadata and logbooks. Finally, we present examples of the datasets in discriminating geomagnetic jerks and study of storms. The digitized and quality-controlled AHMVs data are available at: https://doi.org/10.5281/zenodo.7005471 (Zhang et al., 2022).

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9

Shou, Juan, Limin Ren, Haitang Wang, Fei Yan, Xiaoyun Cao, Hui Wang, Zhiliang Wang, Shanzhu Zhu e Yao Liu. "Reliability and validity of 12-item Short-Form health survey (SF-12) for the health status of Chinese community elderly population in Xujiahui district of Shanghai". Aging Clinical and Experimental Research 28, n. 2 (5 luglio 2015): 339–46. http://dx.doi.org/10.1007/s40520-015-0401-9.

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10

Su, Kan Hua, Hong Liu e Jun Wang. "Borehole Stability Analysis and its Application in Xujiahe Formation of ZJ Block". Advanced Materials Research 524-527 (maggio 2012): 1359–62. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.1359.

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The mainly borehole problems are sticking (collapse) and circulation loss in Xujiahe formation of ZJ block, so the drilling rate is very low. In order to improve the penetration of rate of ZJ block, the rock mechanical test method, ground stress test method, well history statistics method, and logging data analysis method were adopted. The borehole stability mechanism of xujiahe formation was analyzed. Combined with the drilling fluid experimental evaluation, the measures of improve wellbore stability of xujiahe formation was Proposed. Field application tests show that, the borehole problems and its processing time are greatly reduced using those proposed measures. The penetration of rate in the Xujiahe formation of test well increased 20-30%, and the application effect is obvious.

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11

Yu, Yu, Liangbiao Lin, Changbo Zhai, Yanan Wang, Yehan Li e Yan Guo. "Diagenesis and reservoir characteristics analysis of the Late Triassic Xujiahe Formation tight gas sandstone in the northern Sichuan Basin, China". Energy Exploration & Exploitation 36, n. 4 (9 dicembre 2017): 743–63. http://dx.doi.org/10.1177/0144598717745778.

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The Late Triassic Xujiahe Formation is a key target for tight gas in the northern Sichuan Basin. Thin section, scanning electron microscopy, X-ray diffraction, porosity and permeability analyses have been performed to delineate the diagenesis and reservoir characteristics of Xujiahe sandstone. The results show that the Xujiahe Formation contains feldspathic litharenite, litharenite, sublitharenite and quartzarenite sandstone. Sandstones of the Xujiahe Formation are characterized by low feldspar content and both secondary and micro-fracture porosity. Porosity and permeability analyses of 185 core samples show a broad but low porosity range from 0.79 to 10.43% (average 4.55%) and wide but low permeability range (0.0021–26.001 mD, average 0.449 mD). The higher permeabilities result from micro-fracturing. Strong mechanical compaction plays a more important role in reducing primary porosity of sandstone than cementation during eodiagenesis. Carbonate cement is detrimental to reservoir porosity. Early carbonate cement precipitated from depositional water during eodiagenesis can block primary pores while late carbonate cement formed during mesodiagenesis can fill secondary pores. Quartz cement shows a slight relationship with porosity and permeability. There is a positive relationship between grain-coating chlorite and porosity and permeability. The effect of diagenesis on the reservoir quality of Xujiahe tight gas sandstone is greater that depositional environment during deep burial.

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Zhang, Sheng Bin, Zhen Liu, Hong Jun Liu, Ya Hui Song, Xin Min Li e Tao Xu. "Alkali Diagenesis and its Genesis of Xujiahe Sandstone Reservoir in South-Central Sichuan Basin". Advanced Materials Research 347-353 (ottobre 2011): 1701–6. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.1701.

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Alkali diagenesis has been discovered firstly in Xujiahe formation in Sichuan basin. Alkali diagenesis is characterized by quartz dissolution pore. Based on thin section identification, scanning electron microscope and X-ray diffraction analysis, and considering the geological background, the characteristics and formation mechanism of alkali diagenesis in Xujiahe formation are studied thoroughly. The results indicate that the sandstone reservoir in Xujiahe formation has experienced a strong diagenesis and entered the stage of late diagenetic B. Diagenetic environment experienced a transition from acidity to alkalinity. Secondary pores produced by quartz dissolution contribute for the better quality of Xu_2 reservoir.

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13

Wei, Jiongfan, Jingong Zhang e Zishu Yong. "Characteristics of Tight Gas Reservoirs in the Xujiahe Formation in the Western Sichuan Depression: A Systematic Review". Energies 17, n. 3 (25 gennaio 2024): 587. http://dx.doi.org/10.3390/en17030587.

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In current energy structure adjustments, the prominence of unconventional oil and gas resources continues to grow, with increasing attention being paid to tight gas, a major component of natural gas production. The Xujiahe Formation gas reservoir in the Western Sichuan Depression represents a typical tight gas reservoir and the study of its reservoir characteristics is a key focus for current and future exploration and development efforts. This review employs the PRISMA method to screen and integrate the primary findings of 26 documents spanning the period from 2008 to 2023, with the aim of providing a comprehensive overview of the progress and outcomes of research on the tight gas reservoir characteristics of the Xujiahe Formation in the Western Sichuan Depression. The selected research documents summarize the characteristics of the Xujiahe Formation tight gas reservoir in the Western Sichuan Depression from four perspectives: lithology, physical properties, reservoir space, and the main factors influencing reservoir quality. Through a review of these previous studies, it is evident that existing research has predominantly focused on the relationship between diagenesis and reservoir densification, indicating certain limitations. We also delve into the characteristics of tight gas sandstone reservoirs in the study area, considering their depositional systems, fracture development, cementation, and impact on the exploration and development of tight gas reservoirs. Additionally, we propose measures to stabilize and enhance tight gas production in the Xujiahe Formation in the Western Sichuan Depression. Moreover, we outline the next steps for further research and exploration.

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Tan, Kaijun, Juan Chen, Jun Yao, Qingpeng Wu e Jianglong Shi. "Geochemical characteristics and genesis of natural gas in the Upper Triassic Xujiahe Formation in the Sichuan Basin". Open Geosciences 14, n. 1 (1 gennaio 2022): 1061–74. http://dx.doi.org/10.1515/geo-2022-0405.

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Abstract In recent years, the geochemical characteristics, genesis and sources of natural gas in the Upper Triassic Xujiahe Formation in the Sichuan Basin have received extensive attention, but their genesis and sources are still controversial. In this study, taking the natural gas from the Xujiahe Formation in the Sichuan Basin as an example, the source and genesis of the natural gas have been systematically analyzed. The results show that the natural gas of the Xujiahe Formation in the Sichuan Basin is dominated by methane, followed by a small amount of CO2 and N2; only the southern Sichuan area contains a small amount of H2S, which comes from the supply of the underlying carbonate source rocks. Except for the western Sichuan Basin, the drying coefficient of the natural gas is generally less than 0.95 (wet gas). Furthermore, the composition of the natural gas is mainly controlled by the maturity of source rocks. The carbon isotope of ethane in natural gas ranges from −33.9 to −21.5‰, and the hydrogen isotope of methane ranges from −188‰ to −151‰. The carbon and hydrogen isotope values are higher in the western Sichuan Basin than in the central, northeastern and southern Sichuan Basin. The identification of the origin of natural gas and the comparison of gas sources show that the natural gas in the Xujiahe Formation is mainly coal-derived gas from its own coal-measure source rocks; the natural gas in the northern part of the southern Sichuan Basin is oil-derived gas originating from the Changxing Formation and the Silurian marine source rocks; however, the natural gas in the northeastern Sichuan Basin is a mixture of coal-derived and oil-derived gases. In addition, the carbon and hydrogen isotopes in some natural gas samples from the Xujiahe Formation have inversions of δ13C1 > δ13C2, δ13C2 > δ13C3, δ13C3 > δ13C4, and δD2 > δD3, and the magnitude of the inversions is small. It is considered to be caused by the mixing of gases from the same source, as well as the mixing of coal-derived and oil-derived gases.

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Qin, Shengfei, Guoxiao Zhou, Zheng Zhou e Yu Yang. "Geochemical characteristics of natural gases from different petroleum systems in the Longgang gas field, Sichuan Basin, China". Energy Exploration & Exploitation 36, n. 6 (15 marzo 2018): 1376–94. http://dx.doi.org/10.1177/0144598718763902.

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Located in the Sichuan Basin, China, the Longgang gas field consists of three vertically developed petroleum systems with the Triassic Leikoupo Formation as a dividing interface. There is one marine petroleum system below the interface and one continental petroleum system above it. The marine petroleum system is composed of coal measures, the main source rock in the Longtan Formation, and marine reef reservoirs in the Changxing and Feixianguan formations. The continental petroleum system can also be subdivided into two sets. One is the Xujiahe petroleum system sourced from the Xujiahe coal measures in the Upper Triassic formation. The other is a Jurassic petroleum system that is sourced from Jurassic lacustrine black shales. The gas pools in the marine system contain H2S gas. The gases are very dry and the δ13C1 and δ13C2 values display less negative values with an average of −29.2 and −25.0‰, respectively. The gases are humic origin generated at highly to over mature stages from coal measures of the Longtan Formation. The natural gas in the continental petroleum system does not contain H2S. The natural gases from the Xujiahe petroleum system are mainly wet gases with a few dry gases, and belong to typical humic type sourced from coal measures of the Xujiahe Formation. All the gases from this Jurassic petroleum system are wet gases and the alkane gases show more negative carbon isotopic values typical of sapropels. These are derived from the lower Jurassic lacustrine black mudstone. The three sets of petroleum systems in the Longgang gas field are vertically well separated. Each system has its own source rock, and there are no gases from other sources despite multiple tectonic events in the past. The reservoirs had been in a relatively stable tectonic condition with excellent seals by cap rocks during the gas accumulation period.

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Fan, Cunhui, Qirong Qin, Dongfeng Hu, Xiaolei Wang, MengYue Zhu, Wei Huang, Yuxi Li e Muhammad Aqeel Ashraf. "Fractal characteristics of reservoir structural fracture: a case study of Xujiahe Formation in central Yuanba area, Sichuan Basin". Earth Sciences Research Journal 22, n. 2 (1 aprile 2018): 113–18. http://dx.doi.org/10.15446/esrj.v22n2.72250.

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The reservoir structural fractures have excellent fractal characteristics, as well as self-similarities. Based on the fractal theory, the surface fractal characteristics of faults and the fractal characteristic of fractures in the core of the Xujiahe Formation in the Fault-Fold Belt of the central Yuanba area were studied, and a quantitative relationship was set up between them. Based on the fractal characteristics of faults, predictions were made of the favorable fracture zone, which provides a new idea for the research of fracture, as well as offers theoretical references for exploring the fracture development zone during oil-gas exploration. The results show the following: the seismic value of reflection fault fractal dimension of the Xujiahe Formation is 1.5284; the correlation coefficient R2 is bigger than 0.9901; the capacity dimension linear regression correlation coefficient of the fracture in core of the Xujiahe Formation is bigger than 0.98; the fractal dimension D can well reflect the fault and fracture development degree, as well as the complexity of the fracture system; it can quantitatively calculate the density of the fracture of the reservoir in the area; the areas of capacity dimension bigger than 1.45 are the fracture development zones in the Fault-Fold Belt of the central Yuanba area; the oil and gas enrichment degree is high; the areas with the fractal dimension value between 0.95 and 1.45 are the fracture relatively-developed zones; the fractal dimension with values smaller than 0.95 are the lack of fracture areas.

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Gao, Shuai, Shi Zhong Ma, Yan Liu, Lian Bo Zeng e Lei Gong. "Formation Mechanism of Fractures in Tight Sandstone Reservoirs of the Second Member of Xujiahe Formation in the North of Western Sichuan Foreland Basin". Advanced Materials Research 868 (dicembre 2013): 26–29. http://dx.doi.org/10.4028/www.scientific.net/amr.868.26.

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Fractures control the distribution of tight sandstone gas reservoirs in the Second Member of Xujiahe Formation in the north of western Sichuan foreland basin. According to the data of filed outcrops, cores, image logs, slice and experimental analysis, we analyzed the genetic types, development characteristics, formation periods and forming mechanism of the fractures in the study area. Tectonic fracture and diagenesis fracture are the two types of fracture in the Second Member of Xujiahe tight sandstones. Between the two types, tectonic fracture is the main. They are mostly shear fractures with three sets of NEE-SWW, NNE-SSW and NW-SE orientations. Structural shear fractures mostly developed under the tectonism of the end of Indosinian, Yanshan and Himalaya stage. The force that formed tectonic fractures came from compression of Longmen Mountain and Micang-Daba Mountain, overpressure formed from deep buried and stress caused by uplift.

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Chen, Yong, Hao Yu, Qiugui Shu e Fang Fang. "Experimental study of friction coefficient of rocks in high pressure and tight gas reservoirs in Sichuan". Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 232, n. 11 (19 gennaio 2018): 1415–27. http://dx.doi.org/10.1177/1350650117754001.

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The calculation of torque and drag in horizontal wells and extended reach wells is an important element in drilling operations, but determining the value of the friction factor is difficult in the calculation of friction. Sichuan Basin constitutes a special gas reservoir system with high pressure and tight formations. They are favorable for gas production which can be accomplished economically only with horizontal drilling and hydraulic fracturing, and Xujiahe Formation is the focus of the exploration and development. In order to determine the reasonable friction factor for directional well and horizontal well in Xujiahe Formation and complete comprehensive evaluation method, both theoretical study on friction mechanism and experimental investigation on friction factor need to be carried out. A series of experiments are conducted for different lithology (sandstone, sand-mudstone, and mudstone), steel, and lubricants (mud systems). The test results are as follows: lubricants have the most obvious influence on the friction coefficient; the friction-reducing effect of the same lubricant on different friction pairs varies; and lubricants have very different effects on the same friction pair. Under the condition of lubrication with clear water, the friction coefficient of rock increases slightly as the normal load rises. Under lubrication with mud, the change range of the friction coefficient of rock with the increase of normal load is low. Rotation speed has limited impact on the friction coefficient. Under the same test condition, the friction coefficient of sandstone is a little higher in the three kinds of rocks. Through a large number of experimental studies, the value range of the friction coefficient of different kinds of rock in the fifth member in Xujiahe Formation is obtained, providing a scientific basis for the drilling design and the calculation of torque and drag in high pressure and tight formations in Sichuan.

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Xu, Hao, Wen Zhou, Runcheng Xie, Lina Da, Christopher Xiao, Yuming Shan e Haotian Zhang. "Characterization of Rock Mechanical Properties Using Lab Tests and Numerical Interpretation Model of Well Logs". Mathematical Problems in Engineering 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/5967159.

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The tight gas reservoir in the fifth member of the Xujiahe formation contains heterogeneous interlayers of sandstone and shale that are low in both porosity and permeability. Elastic characteristics of sandstone and shale are analyzed in this study based on petrophysics tests. The tests indicate that sandstone and mudstone samples have different stress-strain relationships. The rock tends to exhibit elastic-plastic deformation. The compressive strength correlates with confinement pressure and elastic modulus. The results based on thin-bed log interpretation match dynamic Young’s modulus and Poisson’s ratio predicted by theory. The compressive strength is calculated from density, elastic impedance, and clay contents. The tensile strength is calibrated using compressive strength. Shear strength is calculated with an empirical formula. Finally, log interpretation of rock mechanical properties is performed on the fifth member of the Xujiahe formation. Natural fractures in downhole cores and rock microscopic failure in the samples in the cross section demonstrate that tensile fractures were primarily observed in sandstone, and shear fractures can be observed in both mudstone and sandstone. Based on different elasticity and plasticity of different rocks, as well as the characteristics of natural fractures, a fracture propagation model was built.

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Xue, Xiu Li, Yi Luo e Pei Rong Zhao. "Ultimate Potential Nature Gas Resource Prediction and Exploration Direction in Sichuan Basin". Advanced Materials Research 998-999 (luglio 2014): 1498–503. http://dx.doi.org/10.4028/www.scientific.net/amr.998-999.1498.

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The ultimate natural gas resources of Sichuan Basin were predicted by the application of hydrocarbon reservoir scale sequence method. The results revealed that a total of 236 gas reservoirs exist in Sichuan Basin, with total expected natural gas resources of 57718×108m3.110 gas reservoirs are undiscovered, with geological reserves of 4.04×1012m3, accounting for70.0% of the total natural gas resources, among which, 17 undiscovered gas reservoirs have resources of more than 1000×108m3, 13 undiscovered natural gas reservoirs have resources of 500-1000×108m3 and 15 undiscovered gas reservoirs have resources of 100-500×108m3. The undiscovered natural gas resources mainly lie in the following key exploration fields: Permian-Triassic reef flat reservoir of Huankaijiang-Liangping continental shelf and deep to ultra-deep layers of continental Xujiahe Formation in West Sichuan, medium to shallow layers of Northeast Sichuan and Central Sichuan focused on Xujiahe Formation, piedmont zone of Longmen Mountain and Micang-Daba Mountain, oolitic flat of Jialingjiang Formation of East Sichuan, South Sichuan and North Sichuan as well as five large sets of unconformity surfaces, namely top surface of Sinian Dengying Formation, top surface of Middle-Upper Ordovician, top surface of Middle Carboniferous, top surface of Permian Yangxin Series and top surface of Leikoupo Formation.

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Fang, Yan, Haichun Zhang, Bo Wang e Daran Zheng. "A new cockroach (Blattaria: Caloblattinidae) from the Upper Triassic Xujiahe Formation of Sichuan Province, southwestern China". Insect Systematics & Evolution 44, n. 2 (2013): 167–74. http://dx.doi.org/10.1163/1876312x-44022101.

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A new genus and species of the cockroach family Caloblattinidae, Dazhublattella lini gen. et sp.n., is described from the Upper Triassic Xujiahe Formation of Sichuan Province, in southwestern China. The new taxon is similar to the Triassic Caloblattina mathildae (Geinitz, 1883) (Vršanský & Ansorge 2007) in the venation and pattern, but differs in the less elongated forewing with arched anterior margin. An elemental analysis of the wing is undertaken using Energy Dispersive X-ray analysis.

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Liu, Zhen, Ruigang Zhang, Dan Zhou, Fei Chen, Wei Li, Yang Chen, Zhengda Zhou e Lei Nie. "Triassic in the eastern Sichuan basin ray slope and badong group strata division and correlation". E3S Web of Conferences 352 (2022): 03021. http://dx.doi.org/10.1051/e3sconf/202235203021.

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Triassic strata are widely developed in the eastern part of Sichuan Basin. The Mingyuexia anticline and Huangnitang anticline located in the eastern Sichuan structural belt develop Triassic Jialingjiang Formation to Xujiahe Formation. The middle Triassic Leikoupo Formation and Badong Formation on both sides of the anticline are synchronous and heterogeneous strata. They are distinguished regionally according to their different sedimentary environments and lithologic characteristics, and the phase transition boundary between Leikoupo Formation and Badong Formation is determined.

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Li, Yong, Shijia Chen, Wen Qiu, Kaiming Su e Bingyan Wu. "Controlling factors for the accumulation and enrichment of tight sandstone gas in the Xujiahe Formation, Guang’an Area, Sichuan Basin". Energy Exploration & Exploitation 37, n. 1 (10 ottobre 2018): 26–43. http://dx.doi.org/10.1177/0144598718803224.

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Abstract (sommario):

Tight sandstone gas characterized by a wide distribution, local enrichment and a complex gas–water distribution has high exploration potential. This study, using the Xujiahe Formation in the Guang’an gas field as an example, aims to determine the main controlling factors of the enrichment of tight gas through comprehensive analyses of the source rock and reservoir characteristics, pressure evolution and structural effects by using various methods including well logging, geochemistry, mercury injection, reservoir physical properties and formation pressure. The results show that the proximal-source, interbedded hydrocarbon accumulation results from a dispersed hydrocarbon supply, which is the root cause of the widely distributed tight sandstone gas. The abnormally high reservoir pressure caused the enrichment of tight sandstone gas even under insufficient hydrocarbon generation dynamics; in addition, natural gas preferentially accumulated in the relatively high-quality reservoirs under the same hydrocarbon supply, which means that differences in the reservoir physical properties control gas charge in the reservoir. Structure controls the gas–water differentiation under the stable tectonic background, and the higher the structure is, the more abundant the gas–water differentiation is, and the easier pure gas reservoirs form. Therefore, the accumulation and enrichment of tight sandstone gas in the Xujiahe Formation is controlled by source rocks, abnormally high reservoir pressure and the physical properties and structure of the reservoir.

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Wei, Yuanlong, Wei Liu e Zhenkun Hou. "Experimental Study on the Anisotropic Characteristics and Engineering Application of Tight Sandstone". Advances in Materials Science and Engineering 2021 (5 febbraio 2021): 1–12. http://dx.doi.org/10.1155/2021/3580956.

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The anisotropy of tight sandstone (a type of unconventional gas reservoirs) is a significant factor influencing the characteristics of cracks network under hydrofracturing; thus, it also has a large influence on the final production capacity of the gas reservoirs. To improve the understanding of anisotropy degree and mechanical properties of the tight sandstone of Xujiahe Formation and thus to provide reliable reference for the establishment of hydrofracture model and parameter designing in fracture field, a series of experiments including ultrasonic wave velocity and uniaxial and triaxial compression tests of the tight sandstone samples obtained from Xujiahe Formation with different inclination angles (the angle between sample drilling direction and bedding plane) have been conducted. With the increase of inclination angle, the velocity of the longitudinal wave and elastic modulus both show the tendency of decreasing, whereas the compressive strength shows a “U” shape varying pattern, which is high on sides and low in the middle region. The values of uniaxial compression strength (UCS) are the lowest of sandstone with the inclination angles of 30° and 45°. The fracture patterns are dominant by splitting fracture under uniaxial compression tests. However, shear fracture and dilatancy morphology is the main pattern under triaxial compression test. But the local morphology of the failure surfaces behaves different if the inclination angle is changed. Combining the mechanic theory of transversely isotropic material, the anisotropy parameters of the tight sandstone are analyzed, as well as the influence on the hydrofracturing technology for tight sandstone in the field.

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Liu, Hong, Yuzhe Tang, Xiucheng Tan, Bing He, Song Tang, Yongjia Zhou e Bo Lin. "Paleogeomorphological reconstruction and geological implications of the weathered-crust karst on the top of the Middle Triassic Leikoupo Formation in the Longgang area, Sichuan Basin, China". Energy Exploration & Exploitation 36, n. 4 (23 novembre 2017): 727–42. http://dx.doi.org/10.1177/0144598717741039.

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Weathered-crust karst carbonate is developed in the third submember of the fourth member of the Middle Triassic Leikoupo Formation (Lei43 submember) in the Longgang area of Sichuan Basin, China, and acts as an important oil and gas reservoir. To reconstruct the paleogeomorphology of the weathered-crust karst, we analyzed the seismic thickness of the interval from the erosional unconformity surface on the top of the Leikoupo Formation to the karst at the bottom of the third member of the Xujiahe Formation (Xu3 member), based on existing three-dimensional seismic and drilling data, and the sedimentary characteristics of the Leikoupo and Xujiahe formations. There are three secondary types of geomorphological unit, namely the karst highlands, the karst transitional zone, and the karst basin, and these have distinct karst water development patterns and hydrological conditions that determine the intensity of karstification and reservoir quality. Among them, the karst highlands have a poor reservoir capacity due to their long-term exposure above the water table, which resulted in severe denudation. The karst transitional zone features the superimposition of multiple periods of strong karstification, and this has resulted in high-quality reservoir conditions in the karst monadnocks but poor reservoir conditions in the karren. The karst basin represents a drainage area that experienced weak karstification, and the reservoir capacity is generally poor, although some good reservoirs were developed in shoals. Paleogeomorphological maps provide excellent guides to finding karst monadnocks in karst transitional zones, and monadnocks should serve as the main targets of exploration in the weathered-crust karst reservoir on top of the Lei43 submember.

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LI, LIQIN, YONGDONG WANG, VIVI VAJDA e ZHAOSHENG LIU. "Late Triassic ecosystem variations inferred by palynological records from Hechuan, southern Sichuan Basin, China". Geological Magazine 155, n. 8 (26 settembre 2017): 1793–810. http://dx.doi.org/10.1017/s0016756817000735.

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AbstractThe Late Triassic deposits of the Sichuan Basin, southwestern China are significant for hosting abundant and diverse fossil assemblages including plants (containing spores and pollen), bivalves and insects. However, the Late Triassic palaeoecological variations are still poorly documented in this region. Here we present results from a palynological study from the Upper Triassic Xujiahe Formation in Hechuan of Chongqing, southern Sichuan Basin. The palynological analysis revealed a well-preserved terrestrial palynoflora of high diversity, comprising 184 species in 75 genera of spores and pollen. Three palynological assemblages were recognized, reflecting terrestrial successions throughout the entire interval with significant changes in the vegetation. Cycads/bennettites/ginkgophytes and conifers show an increasing trend into younger deposits, while ferns and lycopsids decrease in relative abundance. The Late Triassic vegetation underwent changes from lowland fern forest to a mixed forest with more canopy trees. We applied the Spore-pollen Morphological Group (SMG) method and Sporomorph EcoGroup (SEG) model to interpret the palaeoclimate features. The results reveal that the lower part of the Xujiahe Formation was deposited under relatively warm and humid conditions with an overall cooling and drying trend from latest Norian to Rhaetian time, accompanied by a general decrease of ferns and simultaneous increase of gymnosperms, and a decline in diversity of miospores. This study presents data on variations within the terrestrial ecosystem prior to the end-Triassic extinction event in the Sichuan Basin, and therefore provides important information for understanding the changes in the vegetation preceding the end-Triassic event.

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27

Wang, Weimin. "BIOLOGY OF LANDLOCKED NEOSALANX PSEUDOTAIHUENSIS IN THA XUJIAHE RESERVOIR, CHINA". Acta Hydrobiologica Sinica 23, n. 6 (1 novembre 1999): 584–90. http://dx.doi.org/10.3724/issn1000-3207-1999-6-584-e.

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28

Zhiguo, Wang. "Study on sedimentary facies characteristics of Xujiahe Formation in Sichuan Basin". E3S Web of Conferences 290 (2021): 02022. http://dx.doi.org/10.1051/e3sconf/202129002022.

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Abstract (sommario):

Sedimentary facies is the summation of all primary sedimentary features in a sedimentary unit, which is the product of sedimentation in a specific environment. It emphasizes the material performance of sediment formation conditions, including mineralogy, petrology, paleontology, geochemistry and geophysics. Therefore, it has unique sedimentary features in this environment. In this paper, the types and units of sedimentary facies which can reflect the basic characteristics and geometry of sedimentary system are established, and based on the comprehensive analysis of rock types, lithological assemblages, sedimentary structures, palaeontological assemblages and section structures, the sedimentary facies types of Xujiahe formation of Upper Triassic in the study area mainly include semi-arid flooded basin facies, delta facies, beach bar-lagoon system and lake facies, among which delta facies and beach bar-lagoon system are the main sedimentary facies types. Because sedimentary facies is the historical product of basin formation, evolution and extinction, it can not only reflect the formation conditions, temporal and spatial distribution and evolution law of related strata and rock types, but also be the basis for analyzing the nature and structural background of sedimentary basin. At the same time, the analysis of sedimentary facies is of great significance for understanding and analyzing the evolution history of basin and guiding the exploration and development of related oil and gas resources.

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29

胡, 凤英. "Reservoir Inversion Technology and Application of Xujiahe Formation in Northeastern Puguang". Advances in Geosciences 14, n. 06 (2024): 809–22. http://dx.doi.org/10.12677/ag.2024.146075.

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30

Wang, Youzhi, Cui Mao, Qiang Li, Wei Jin, Simiao Zhu, Xiandong Wang, Zhiguo Wang et al. "Pore throat characteristics of tight reservoirs by a combined mercury method: A case study of the member 2 of Xujiahe Formation in Yingshan gasfield, North Sichuan Basin". Open Geosciences 13, n. 1 (1 gennaio 2021): 1174–86. http://dx.doi.org/10.1515/geo-2020-0273.

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Abstract (sommario):

Abstract The complex pore throat characteristics are significant factors that control the properties of tight sandstone reservoirs. Due to the strong heterogeneity of the pore structure in tight reservoirs, it is difficult to characterize the pore structure by single methods. To determine the pore throat, core, casting thin sections, micrographs from scanning electron microscopy, rate-controlled mercury injection, and high-pressure mercury injection were performed in member 2 of Xujiahe Formation of Yingshan gasfield, Sichuan, China. The pore throat characteristics were quantitatively characterized, and the distribution of pore throat at different scales and its controlling effect on reservoir physical properties were discussed. The results show that there are mainly residual intergranular pores, intergranular dissolved pores, ingranular dissolved pores, intergranular pores, and micro-fractures in the second member of the Xujiahe Formation tight sandstone reservoir. The distribution range of pore throat is 0.018–10 μm, and the radius of pore throat is less than 1 μm. The ranges of pore radius were between 100 and 200 μm, the peak value ranges from 160 to 180 μm, and the pore throat radius ranges from 0.1 to 0.6 μm. With the increase of permeability, the distribution range of throat radius becomes wider, and the single peak throat radius becomes larger, showing the characteristic of right skew. The large throat of the sandy conglomerate reservoir has an obvious control effect on permeability, but little influence on porosity. The contribution rate of nano-sized pore throat to permeability is small, ranging from 3.29 to 34.67%. The contribution rate of porosity was 48.86–94.28%. Therefore, pore throat characteristics are used to select high-quality reservoirs, which can guide oil and gas exploration and development of tight sandstone reservoirs.

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31

Wang, Youzhi, Cui Mao, Qiang Li, Wei Jin, Simiao Zhu, Xiandong Wang, Zhiguo Wang et al. "Pore throat characteristics of tight reservoirs by a combined mercury method: A case study of the member 2 of Xujiahe Formation in Yingshan gasfield, North Sichuan Basin". Open Geosciences 13, n. 1 (1 gennaio 2021): 1174–86. http://dx.doi.org/10.1515/geo-2020-0273.

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Abstract (sommario):

Abstract The complex pore throat characteristics are significant factors that control the properties of tight sandstone reservoirs. Due to the strong heterogeneity of the pore structure in tight reservoirs, it is difficult to characterize the pore structure by single methods. To determine the pore throat, core, casting thin sections, micrographs from scanning electron microscopy, rate-controlled mercury injection, and high-pressure mercury injection were performed in member 2 of Xujiahe Formation of Yingshan gasfield, Sichuan, China. The pore throat characteristics were quantitatively characterized, and the distribution of pore throat at different scales and its controlling effect on reservoir physical properties were discussed. The results show that there are mainly residual intergranular pores, intergranular dissolved pores, ingranular dissolved pores, intergranular pores, and micro-fractures in the second member of the Xujiahe Formation tight sandstone reservoir. The distribution range of pore throat is 0.018–10 μm, and the radius of pore throat is less than 1 μm. The ranges of pore radius were between 100 and 200 μm, the peak value ranges from 160 to 180 μm, and the pore throat radius ranges from 0.1 to 0.6 μm. With the increase of permeability, the distribution range of throat radius becomes wider, and the single peak throat radius becomes larger, showing the characteristic of right skew. The large throat of the sandy conglomerate reservoir has an obvious control effect on permeability, but little influence on porosity. The contribution rate of nano-sized pore throat to permeability is small, ranging from 3.29 to 34.67%. The contribution rate of porosity was 48.86–94.28%. Therefore, pore throat characteristics are used to select high-quality reservoirs, which can guide oil and gas exploration and development of tight sandstone reservoirs.

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Liu, Houbin, Shuai Cui, Yingfeng Meng, Yu Fan, Teng Liu, Anran Yu e Zhongzhi Hu. "Wellbore stability evaluation method based on the continuous tangent envelope of a Mohr circle". Science Progress 103, n. 1 (25 novembre 2019): 003685041988846. http://dx.doi.org/10.1177/0036850419888465.

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Abstract (sommario):

It is of great practical significance to accurately obtain formation collapse pressure and determine an effective three-pressure profile with a correct strength criterion in the drilling process to identify the best drilling fluid density. Taking the tight sandstone of the XuJiahe formation as an example, we conducted a series of rock mechanics tests, focusing on large-scale, high-density confining pressure triaxial experiments; determined a mathematical expression for the continuous tangent envelope of a nonlinear Mohr circle envelope based on a series of triaxial tests; and clarified the variation rules of cohesion force and internal friction angle with confining pressure. The impact of rock mechanics parameters determined by using the traditional method and the continuous tangent envelope method on wellbore stability is compared and analyzed by using the MathCAD program, and then the collapse pressure is obtained. The results show that the parabolic curve derived from the uniaxial rock mechanics test data of the XuJiahe formation is not suitable for the triaxial test results under high confining pressure. By means of the continuous tangent envelope method, the relationship between rock cohesion and internal friction angle and confining pressure is obtained; this replaces the traditional collapse pressure calculation results using geophysical logging data or uniaxial tests, and the relationship between cohesion and friction angle is more consistent with confining pressure. The MathCAD simulation analysis shows that the rock mechanics parameters determined by the continuous tangent envelope can reflect the stratum situation more truly than the linear envelope method. Compared with the linear envelope method and parabolic envelope method under the same conditions, the continuous tangent envelope method has certain advantages in determining the critical density, which provides a theoretical basis for the accuracy of sandstone formation collapse pressure calculation and can give significant guidance for the study of wellbore stability of deep sandstone formations.

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Liao, Zonghu, Weilun Chen, Xiaofeng Chen, Huayao Zou e Fang Hao. "Multiscale fracture and damage zone characterization in a tight sandstone reservoir, Sichuan Basin, China". Interpretation 8, n. 4 (26 giugno 2020): SP1—SP11. http://dx.doi.org/10.1190/int-2019-0107.1.

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Abstract (sommario):

Fractures within fault damage zones are crucial for the migration of subsurface fluids, which is challenging the characterization of the fractures and damage zones in the subsurface due to the lack of subsurface data. We have investigated the fractures and fault damage zones in the tight sandstone gas-bearing Xujiahe Formation in the northeast Sichuan Basin, China, based on a comprehensive study of seismic data, well log, core, as well as field observations. We have demonstrated the structure and distribution of damage zones from the basin-scale down to the microscale. The core samples find mostly opening-mode microfractures that can be subcritically generated under low tectonic stress fields since the Late Triassic-Middle Jurassic. These opening-mode microfractures in such ultra-low-permeability sandstone are likely to provide a storage volume for coal gas to accumulate. Macrofractures from image logging and outcrop display well-developed joint networks within the sandstone. The basin-wide distribution of such macrofractures implies potential conduits for gas migration during basin uplift in the Cretaceous. The damage zones are formed and controlled by a system of reverse faults, with thicknesses ranging 100–1500 m. The multiscale analysis of fractures implies that, for the tight sandstone within the Xujiahe Formation, the fractures and damage zones are likely to control the gas migration and accumulation during the tectonic transformation from the Late Cretaceous to the Quaternary Period. The overpressure history, coupled with the fracture system, enhances the redistribution of the gas reservoir. This approach and these data lead to a more in-depth understanding of the fractures and damage zones on a regional scale, which could extend to hydraulic and mechanical characterization of damage zones in the upper crust.

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Li, Jitong, Junlong Liu, Hongde Chen, Jianhua He, Ruyue Wang, Xupeng Shao e Xin Fang. "Fracture Modeling of Deep Tight Sandstone Fault-Fracture Reservoir Based on Geological Model and Seismic Attributes: A Case Study on Xu 2 Member in Western Sichuan Depression, Sichuan Basin". Geofluids 2023 (14 giugno 2023): 1–14. http://dx.doi.org/10.1155/2023/6516181.

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Abstract (sommario):

With significant geological reserves and high resource abundance, the Xujiahe Formation in the Western Sichuan Depression is considered a key target for natural gas exploration and development in continental clastic rocks within the Sichuan Basin. However, this formation remains underdeveloped. Critical to forming “sweet spots” of tight reservoir is the presence of fractures. Based on available data sources, including core samples, well logs, and outcrop data, we utilized a combination of geophysical and geological modeling techniques to clarify the characteristics of effective fractures in tight gas reservoirs. This allowed us to construct a geological model of a tight sandstone fault-fracture gas reservoir in the Xu 2 Member of the Xujiahe Formation located in the Xinchang area, which represents a fault-fracture reservoir formed by high-angle faulting-derived fractures and controlled by the S-N trending fault. With this model, a variety of seismic attributes, including likelihood and entropy, was used to predict the fault-fracture reservoir. Furthermore, geological information, well logs, and seismic attributes were integrated for characterizing the fractures of different scales. The cutoff on various attributes for characterizing the fault-fracture reservoir was defined, and the distribution of the fault-fracture reservoir was delineated. By using the geological modeling technique, the fracture model of the fault-fracture reservoir comprising natural fractures at different scales was built. This model provides further guidance for the exploration and development of the Xu 2 Member tight gas reservoirs in the Xinchang area and, as demonstrated by drilling results, has achieved remarkable effects in practice. This approach has shown good performance in characterizing fracture models. However, due to the complexity of fractures and the discrepancy between the scale of fractures and the scale that can be predicted by geophysical methods, there may still be some uncertainties associated with this method.

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Liu, Zhengwen, Qinglong Wu, Yaohui Hu e Kuanyi Li. "Diel Vertical Distribution ofLeptodora kindtiand Its PreyDiaphanosoma dubiain Xujiahe Reservoir (Central China)". Journal of Freshwater Ecology 17, n. 2 (giugno 2002): 337–39. http://dx.doi.org/10.1080/02705060.2002.9663903.

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36

刘, 欣. "The Sedimentary Pattern and Conceptual Mode of Xujiahe Formation in Sichuan Basin". Journal of Oil and Gas Technology 40, n. 04 (2018): 17–22. http://dx.doi.org/10.12677/jogt.2015.404088.

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王, 晓飞. "The Reservoir Characteristics of the Xujiahe Formation, in Anyue Area, Central Sichuan". Open Journal of Nature Science 05, n. 03 (2017): 326–34. http://dx.doi.org/10.12677/ojns.2017.53045.

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38

刘, 欣. "The Sedimentary Pattern and Conceptual Mode of Xujiahe Formation in Sichuan Basin". Journal of Oil and Gas Technology 40, n. 04 (2018): 17–22. http://dx.doi.org/10.12677/jogt.2018.404088.

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39

WANG, Ze-cheng, Wen-zhi ZHAO, Zong-yin LI, Xing-fu JIANG e Jun LI. "Role of basement faults in gas accumulation of Xujiahe Formation, Sichuan Basin". Petroleum Exploration and Development 35, n. 5 (ottobre 2008): 541–47. http://dx.doi.org/10.1016/s1876-3804(09)60087-2.

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40

Rukai, Zhu, Zhao Xia, Liu Liuhong, Wang Xuesong, Zhang Nai, Guo Hongli e Song Lihong. "Depositional system and favorable reservoir distribution of Xujiahe Formation in Sichuan Basin". Petroleum Exploration and Development 36, n. 1 (febbraio 2009): 46–55. http://dx.doi.org/10.1016/s1876-3804(09)60110-5.

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41

Liu, Sibing, Anqing Chen, Zhongmin Shen, Zhengxiang Lv e Xiaoxing Zhang. "Fluid-rock interaction and dissolution of feldspar in the Upper Triassic Xujiahe tight sandstone, western Sichuan Basin, China". Open Geosciences 10, n. 1 (30 giugno 2018): 234–49. http://dx.doi.org/10.1515/geo-2018-0018.

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Abstract (sommario):

Abstract Secondary porosity in the Upper Triassic Xujiahe tight sandstone of the western Sichuan Basin is mainly the product of feldspar dissolution. In the Xu-4 Member, the upper reservoir of the Xujiahe Formation, feldspars are dissolved to a significant extent and observations indicate that nearly all feldspars have been dissolved completely, with only 1.73% content of feldspar remaining. In the Xu-2 Member, the lower reservoir, feldspars are well preserved; the current content of feldspar is 12.54% on average, and the secondary porosity derived from feldspar dissolution is less than 1%. Kaolinite occurs almost exclusively in the Xu-4, but it is nearly absent in the Xu-2. The K+ content in the Xu-2 is 3.3 times higher than that in Xu-4. The K+/H+ ratio in the Xu-2 is also higher than that in the Xu-4. These differences between the two reservoirs can be attributed to their distinguishing fluid-rock systems. The low K+ content and relatively high δ18O in the Xu-4 formation water are the result of intensive fluid-rock interaction in an open fluid-rock system. The upper Xu-4 is close to the overlying coal-measures of the Xu-5 from which organic acid flowed into the Xu-4. Meanwhile, K+ contained in sandstone migrated out to the mudstones. The resulting low K+/H+ ratio in the formation water of the Xu-4 was responsible for almost all the feldspar dissolution and kaolinite formation. In contrast, due to the relatively closed fluid-rock system in the Xu-2, K+ did not migrate into adjacent rocks and acidic fluids did not invade, which led to K+-rich formation waters maintaining a high K+/H+ ratio. Hence, K-feldspar was well preserved and kaolinite was completely transformed into illite. Therefore, in contrast to the Xu-2 tight sandstone, the Xu-4 sandstone has relatively higher secondary porosity, which favours the formation of better quality reservoirs.

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42

Ruan, Chuantong, Jing Ba, José M. Carcione, Tiansheng Chen e Runfa He. "Microcrack Porosity Estimation Based on Rock Physics Templates: A Case Study in Sichuan Basin, China". Energies 14, n. 21 (2 novembre 2021): 7225. http://dx.doi.org/10.3390/en14217225.

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Abstract (sommario):

Low porosity-permeability structures and microcracks, where gas is produced, are the main characteristics of tight sandstone gas reservoirs in the Sichuan Basin, China. In this work, an analysis of amplitude variation with offset (AVO) is performed. Based on the experimental and log data, sensitivity analysis is performed to sort out the rock physics attributes sensitive to microcrack and total porosities. The Biot–Rayleigh poroelasticity theory describes the complexity of the rock and yields the seismic properties, such as Poisson’s ratio and P-wave impedance, which are used to build rock-physics templates calibrated with ultrasonic data at varying effective pressures. The templates are then applied to seismic data of the Xujiahe formation to estimate the total and microcrack porosities, indicating that the results are consistent with actual gas production reports.

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LUO, Liang, Dong JIA, Jiafu QI, Guoqi WEI e Fei DENG. "Tectono-sedimentary Evolution of the Late Triassic Xujiahe Formation in the Sichuan Basin". Acta Geologica Sinica - English Edition 87, n. 6 (dicembre 2013): 1554–68. http://dx.doi.org/10.1111/1755-6724.12159.

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44

Wang, Ying, Keyin Zhang, Qigang Gan e Wen Zhou. "Fracture development characteristics in the Upper Triassic Xujiahe Formation, western Sichuan depression (China)". Journal of Petroleum Science and Engineering 135 (novembre 2015): 542–51. http://dx.doi.org/10.1016/j.petrol.2015.10.016.

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45

熊, 亮. "Discussion on the Gas Production Area of Xujiahe Formation in West Sichuan Depression". Open Journal of Nature Science 05, n. 02 (2017): 172–84. http://dx.doi.org/10.12677/ojns.2017.52024.

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46

Weimin, WANG, e AMARARATNE Yakupitiyage. "Ovarian Development and Spawning Pattern of Neosalanx pseudotaihuensis Zhang in Xujiahe Reservoir, Hubei Province". Journal of Lake Sciences 11, n. 4 (1999): 338–45. http://dx.doi.org/10.18307/1999.0409.

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47

Zhou, Jia, Du Zheng, Shiwei Jin, Xian Wang, Haihua Zhuo e Daniel Dianchen Gang. "Analysis and Risk Assessment of Organic Pollutants in Surface Water from Xujiahe Basin, China". Bulletin of Environmental Contamination and Toxicology 105, n. 3 (25 agosto 2020): 453–59. http://dx.doi.org/10.1007/s00128-020-02970-2.

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48

Wu, Chao Rong, Wen Shen Duan e Rong Cai Zheng. "3D Visualization Prediction of Fractured Reservoir in Xujiahe Formation of Sichuan Basin in China". Advanced Materials Research 1010-1012 (agosto 2014): 1440–45. http://dx.doi.org/10.4028/www.scientific.net/amr.1010-1012.1440.

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Abstract (sommario):

Rock of Xujiahe formation in Sichuan basin is characterized by very low porosity and permeability, forecast the spatial distribution of fractured reservoir is the key of success in exploration. Combine logging and seismic data, analysis multi-attributes, optimizing post-stack seismic data processing method, we selected amplitude, average energy, chaotic reflection and amplitude weighted instantaneous frequency (AWIF) to study seismic response. The fractured reservoir have weak amplitude, low average energy, low AWIF and high chaotic reflection. Then with the aid of 3D visual technology, research data set, and recognize that some data, like amplitude and impedance etc, should emphases low value, others like chaotic reflection and auto-fault extraction(AFE) etc, should stand out high value. Base on these, form a suit of technology predicting fractured reservoir by using 3D visualization method. Take amplitude, chaotic reflection and AFE data as case, depict the spatial distribution of fractured reservoir. The results can clearly exhibit the spatial distribution of reservoir

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49

李, 亚晶. "Study on the Multi-Solutions of the Classical Model for Dessert Prediction in Xujiahe Formation—Taking the Gas Reservoir of the 3rd Member of Xujiahe Formation in Dayi Area as an Example". Advances in Geosciences 09, n. 09 (2019): 839–45. http://dx.doi.org/10.12677/ag.2019.99089.

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50

Zhou, Guoxiao, Guoqi Wei e Guoyi Hu. "The geochemical and organic petrological characteristics of coal measures of the Xujiahe formation in the Sichuan Basin, China". Energy Exploration & Exploitation 37, n. 3 (8 aprile 2019): 889–906. http://dx.doi.org/10.1177/0144598719842332.

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Abstract (sommario):

Upper Triassic coaly and lacustrine source rocks complicate efforts to determine the source of hydrocarbons in Sichuan Basin. Total organic carbon analyses, pyrolysis experiments, petrological examinations, and gas chromatography and gas chromatography–mass spectrometry determinations were conducted on coals, carbonaceous mudstones and mudstones collected from two outcrop sections and cores of nine wells. Results revealed that the abundant organic carbon content will prolong the hydrocarbon generation cycle for coals and then the hydrocarbon generating capacity of coals will be enhanced by salinization, thereby contributing bacteria and algae microorganisms into humic coal of the Xujiahe Formation. Compared with mudstone, coal with the same maturity has a stronger adsorption effect on free hydrocarbons. When Ro is greater than 1.35, coal still has a strong hydrocarbon generation ability. The stable water column stratification and euxinic bottom water conditions are evidenced from the lower Pr/Ph and the higher gammacerane indices. The mixing of sea water has been proven by the existence of 4α,23,24,-trimethylcholestanes.

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