Добірка наукової літератури з теми "Nuclear magnetic resonance; rock mechanics"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся зі списками актуальних статей, книг, дисертацій, тез та інших наукових джерел на тему "Nuclear magnetic resonance; rock mechanics".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Статті в журналах з теми "Nuclear magnetic resonance; rock mechanics"
1
Tai, Yanzhi. "Study on Prediction Model of Mechanical Parameters of Rock Frozen-Thawed Damage based on NMR Technology." Geofluids 2022 (August 10, 2022): 1–8. http://dx.doi.org/10.1155/2022/5046892.
Повний текст джерелаАнотація:
In order to establish prediction models for the mechanical parameters of rock freeze-thaw damage based on nuclear magnetic resonance (NMR) technology, with reference to the laboratory test of rock mechanical parameters after freeze-thaw, combined with low-field NMR and multivariate analysis methods, PLSR and PCR prediction models for the peak stress, peak strain, and elastic modulus of frozen-thawed rocks were established. The results show that the correlation coefficient of calibration set ( R 2 cal ) and validation set ( R 2 val ) of the PLSR and PCR prediction models are both greater than 0.9, and the residual prediction deviation (RPD) of each model is greater than 3, indicating that the established prediction models have good stability, small relative error, and high prediction accuracy. The application evaluation results show that the peak stress and peak strain of frozen-thawed rocks can be accurately predicted using these models. In this paper, only the NMR tests are performed on the frozen-thawed rocks, and no rock mechanics experiments are performed. The research results provide a new method for the research of rock freeze-thaw damage.
2
Chu, Fujiao, Dunwen Liu, Xiaojun Zhang, Hui Yu, and Guangli Zhu. "Dynamic Response and Damage Regularity of Sandstone with Different Moisture States under Cyclic Loading." Fractal and Fractional 6, no. 4 (April 18, 2022): 226. http://dx.doi.org/10.3390/fractalfract6040226.
Повний текст джерелаАнотація:
In the process of geotechnical engineering excavation, wet and water-filled rock masses are inevitable. To obtain the mechanical properties of these rocks, indoor tests are required, and most of the rock tests rock tests are dry or nearly dry. They cannot really reflect the true nature of the rock, let alone its nature under a dynamic load. The rock was repeatedly impacted during the blasting excavation process. To determine the mechanical response characteristics and damage evolution of rocks with different moisture states under cyclic dynamic loads, rock samples with three saturation levels were prepared. In the experiment, the Hopkinson pressure bar equipment was utilized to perform five cycles of impact with the same incident energy, and the dynamic response of rocks with different impact times was recorded. Nuclear magnetic resonance technology was employed to obtain the change law of the pores of rock specimens after impact, and the cumulative damage rules of rock were combined with the fractal theory. From the experiments, it can be observed that the stress-strain curves of all rock samples are similar, in that they all have stress addition and unloading stages. The peak stress is proportional to the impact time and moisture content, whereas the opposite is true for the peak strain. After the impact, the small and large pores closed and increased, respectively. The porosity and porosity change rate increased with an increase in the impact time. With an increase in moisture content, this trend is more obvious. It can be observed via magnetic resonance imaging that the internal fractures of the water-bearing rock are obvious after multiple impacts. In particular, the saturated rock specimens exhibited severe damage. Fractal analysis of the NMR figures revealed that after three impact times, the fractal dimension change in the water-bearing rock samples was not obvious. This phenomenon indicated that a macro gap appeared. The fractal dimensions of the dry rock samples continued to increase, and the internal damage was less obvious.
3
Li, Hao, Zuliang Zhong, Kenneth Imo-Imo Eshiet, Yong Sheng, Xinrong Liu, and Dongmin Yang. "Experimental Investigation of the Permeability and Mechanical Behaviours of Chemically Corroded Limestone Under Different Unloading Conditions." Rock Mechanics and Rock Engineering 53, no. 4 (November 4, 2019): 1587–603. http://dx.doi.org/10.1007/s00603-019-01961-y.
Повний текст джерелаАнотація:
Abstract This paper investigates the mechanical properties and permeability of chemically corroded rock during deep underground tunneling. Nuclear magnetic resonance tests are carried out to quantify the chemical damage of limestone samples at the microscopic scale. Coupled hydrostatic pressure-unloading tests at different unloading rates are also conducted on these chemically corroded limestone samples to investigate permeability changes and chemical effects on mechanical behaviours. Magnetic resonance imaging, T2 spectrum distribution and porosity of the samples are obtained, and the chemical micro damage is visualized and quantified. The relationship between permeability and mechanical behaviors of the rock under hydrochemical–mechanical coupled effects is investigated. The results show that the permeability development process of the chemical corroded samples can be divided into three stages: at the first stage, the permeability initially decreases, and the second stage starts at the inflection point of the permeability curve, from where the permeability begins to increase slightly. At the third stage, the permeability of the limestone increases dramatically until the sample is ruptured. Chemical corrosion and unloading rates have a combined and significant influence on the development of micro cracks in rocks, which is the root cause of the permeability changes. A stress-permeability model is proposed to describe the permeability and stresses in chemical-corroded limestone; this can be adopted for other sedimentary rocks.
4
Deng, Hong Wei, Chun Fang Dong, Jie Lin Li, Ke Ping Zhou, Wei Gang Tian, and Jian Zhang. "Experimental Study on Sandstone Freezing-Thawing Damage Properties under Condition of Water Chemistry." Applied Mechanics and Materials 608-609 (October 2014): 726–31. http://dx.doi.org/10.4028/www.scientific.net/amm.608-609.726.
Повний текст джерелаАнотація:
For the purpose of researching the freezing-thawing cycle pHysical mechanics properties of sandstone in various chemical solutions, taking the red sandstones from Shandong as the example, freezing-thawing cycles experiments under the condition of H2SO4 solution (pH≈1.5), NaOH solution (pH≈12.5), NaCl solution (pH≈7, mass fraction is 4%) and water were conducted. The nuclear magnetic resonance (NMR) technique was used to test the porosity of rock samples after freezing-thawing cycles. Brazilian splitting test was also conducted to test the samples with different times of freezing-thawing cycles and soaking solutions. Results show that the quality change of samples in various solutions is different. The mass of sample in water increased, however, the mass change of the sample in other three solutions showed a firstly increasing and then decreasing tendency. The porosity distribution in rock changed obviously after different time’s freezing-thawing cycles. After 30 times freezing-thawing cycles, the porosity in H2SO4 solution, NaOH solution, NaCl solution and water has increased by 151.1%, 85.443%, 39.388%, and 17.976% respectively. With the increase of freezing-thawing cycle’s times, tensile strength of the rock reduced, but the damage properties were different in various solutions. The research can provide some mechanical parameters basis to physical mechanics properties of sandstones.
5
Deng, Hong Wei, Chun Fang Dong, Jie Lin Li, Ke Ping Zhou, Wei Gang Tian, and Jian Zhang. "Experimental Study on Sandstone Freezing-Thawing Damage Properties under Condition of Water Chemistry." Applied Mechanics and Materials 556-562 (May 2014): 826–32. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.826.
Повний текст джерелаАнотація:
For the purpose of researching the freezing-thawing cycle physical mechanics properties of sandstone in various chemical solutions, taking the red sandstones from Shandong as the example, freezing-thawing cycles experiments under the condition of H2SO4solution (pH≈1.5), NaOH solution (pH≈12.5), NaCl solution (pH≈7, mass fraction is 4%) and water were conducted. The nuclear magnetic resonance (NMR) technique was used to test the porosity of rock samples after freezing-thawing cycles. Brazilian splitting test was also conducted to test the samples with different times of freezing-thawing cycles and soaking solutions. Results show that the quality change of samples in various solutions is different. The mass of sample in water increased, however, the mass change of the sample in other three solutions showed a firstly increasing and then decreasing tendency. The porosity distribution in rock changed obviously after different time’s freezing-thawing cycles. After 30 times freezing-thawing cycles, the porosity in H2SO4solution, NaOH solution, NaCl solution and water has increased by 151.1%, 85.443%, 39.388%, and 17.976% respectively. With the increase of freezing-thawing cycle’s times, tensile strength of the rock reduced, but the damage properties were different in various solutions. The research can provide some mechanical parameters basis to physical mechanics properties of sandstones.
6
Zhang, Xiang, Manke Wei, Zhen Lei, and Ying Chen. "A Multi-Scale Study on the Property Degradationof High-Temperature Treated Beishan Granite." Minerals 13, no. 1 (December 23, 2022): 27. http://dx.doi.org/10.3390/min13010027.
Повний текст джерелаАнотація:
Granite is the main host rock for the underground storage of nuclear waste in Beishan, China. Heat is continuously generated during the long-term disposal of nuclear waste; therefore, it is important to investigate the influence of high temperature on the physical and mechanical properties and the constitutive relation of Beishan granite. In this study, laboratory experiments on heat-treated (25 ∘C, 200 ∘C, 400 ∘C, 600 ∘C and 800 ∘C) Beishan granite samples were performed in combination with nuclear magnetic resonance (NMR) analysis and regular physical-mechanical tests. The results show that the elastic modulus tends to decline faster at the temperature ranges of 25–200 ∘C and 600–800 ∘C by approximately 26.767% and 66.996%, respectively. Compared with the results at 25 ∘C, the peak stress decreases by 72.664% at 800 ∘C. The peak strain increases gradually from 25 ∘C to 600 ∘C and abruptly from 600 ∘C to 800 ∘C. The peak strain at 800 ∘C is 2.303× greater than that at 25 ∘C. Based on the damage theory, the Weibull distribution, the rock damage threshold point, and the residual strength, this study corrected the Drucker–Prager (D–P) criterion to consider the damage stress and then to establish the constitutive model of thermally damaged Beishan granite. The parameters required for the model are conventional mechanical parameters that can be calculated from the uniaxial test results, thus making the model convenient to apply. Meanwhile, the mechanical behavior of thermally damaged Beishan granite under uniaxial compression was simulated using the Particle Flow Code (PFC) to explore the development of cracks from the microscopic scale. The research results can provide theoretical support for the calculation and numerical simulation related to the mechanics of high-temperature treated rocks.
7
Tan, Maojin, Hongliang Wu, Jinyan Zhang, Kewen Wang, Keyu Mao, Bo Li, and Chenglin Li. "Influencing mechanics and correction method of nuclear magnetic resonance measurement in igneous rocks reservoir." Journal of Petroleum Science and Engineering 208 (January 2022): 109648. http://dx.doi.org/10.1016/j.petrol.2021.109648.
Повний текст джерела
8
Dang, Chen, Zhili Sui, Xiuyuan Yang, and Zhenlong Ge. "Pore Changes in Purple Mudstone Based on the Analysis of Dry-Wet Cycles Using Nuclear Magnetic Resonance." Shock and Vibration 2022 (January 25, 2022): 1–13. http://dx.doi.org/10.1155/2022/5578401.
Повний текст джерелаАнотація:
The study on the change of rock pore structure during the weathering of purple mudstone is of guiding significance to the stability of the bank slope of the three gorges reservoir. In this paper, the pore changes in the wet and dry circulation of purple mudstone in the three gorges reservoir area are studied by means of nuclear magnetic resonance (NMR). The results show that the simulated weathering of wet and dry circulation has a great influence on the purple mudstone. With an increase in the number of dry-wet cycles, the purple mudstone pore volume ratio significantly changed. Originally, it consisted of a small pore structure with a single pore diameter of 0.01–0.1 µm and changed to a variety of pore structures with various pore diameters of 0.001–100 µm. With the increase in the number of dry-wet cycles, the micropores (0.001–0.1 µm) were transformed into macropores (0.1–1 µm). The area of the second peak of the three samples (large pores 0.1–1 µm) increased from 0.9413, 0.9974, and 0.6779 to 0.9871, 1.1498, and 0.9901, respectively.
9
Liu, Fujun, Liu Yang, and Hailiang Jia. "Variation in Anisotropy with Dehydration in Layered Sandstone." Water 13, no. 16 (August 16, 2021): 2224. http://dx.doi.org/10.3390/w13162224.
Повний текст джерелаАнотація:
Anisotropy in rock could significantly affect the stability and safety of rock engineering by differing physical and mechanical properties of rock in different directions. Another major factor for physical and mechanical properties of rock is moisture state, however, whether anisotropy can be altered by it remains unclear. This study investigated variation in anisotropy (by conduct-ing ultrasonic tests) with moisture state (measured by nuclear magnetic resonance) in layered sandstones, and interpreted the phenomenon from the perspective of linking dehydration with pore structure of rock. The results show that (1) sandstone with more obvious bedding bears stronger anisotropy, the P-wave velocity in the perpendicular direction is much lower than that in the parallel direction. (2) The anisotropy index fluctuates around 1 with dehydration of sandstone without obvious bedding, while the anisotropy in sandstone with obvious bedding was significantly enhanced be dehydration. (3) During dehydration bulk water escaped firstly then capillary water and bound water. (4) Dehydration is controlled by the bedding structure. The different dehydration rates of pore water in different directions inevitably lead to heterogeneity in moisture state that change the anisotropy of the rock, which is reflected by the non-synchronous changes in P-wave velocities in different directions.
10
Che, Yongxin, Yongjun Song, Jianxi Ren, Jiaxing Chen, Xixi Guo, Hao Tan, and Mengling Hu. "Creep Characteristics of Different Saturated States of Red Sandstone after Freeze-Thaw Cycles." Geofluids 2021 (September 9, 2021): 1–13. http://dx.doi.org/10.1155/2021/6622380.
Повний текст джерелаАнотація:
To investigate the creep mechanical characteristics of rocks in different saturated states after freeze-thaw cycles, samples with different saturations (30%, 50%, 70%, 90%, and 100%) were selected for nuclear magnetic resonance (NMR), scanning electron microscopy (SEM), and uniaxial compression creep tests. The internal microscopic damage of the rock sample and mechanical characteristics under long-term loading are analyzed after the action of freeze-thaw cycles. The test results show that, as the saturation increases, the T2 spectrum distribution shifts to the right. The spectrum area gradually increases as the porosity increases. The critical saturation of freeze-thaw damage occurs when the saturation increases from 70% to 90%. It can be seen from the SEM image that the number of pores inside the rock samples gradually increases with increases in saturation, leading to the appearance of cracks. Under long-term loading, the saturation has a significant influence on the time-efficiency characteristics of sandstone freeze-thaw. As the saturation increases, the creep deformation gradually increases. After reaching 70%, the axial creep strain increases significantly. The rate of creep is accelerated, the creep failure stress is reduced, and the creep time under the last level of stress is significantly increased. A modified viscous-plastic body is connected in series to the basic Burgers model, the freeze-thaw-damage viscous element is introduced, and the creep parameters are fitted using test data. The results will provide a reference for long-term antifreeze design for rock engineering in cold areas.
Дисертації з теми "Nuclear magnetic resonance; rock mechanics"
1
Ronan, Leah L. "An NMR investigation of pore size and paramagnetic effects in synthetic sandstones /." Connect to this title, 2006. http://theses.library.uwa.edu.au/adt-WU2007.0198.
Повний текст джерела
2
Ronan, Leah L. "An NMR investigation of pore size and paramagnetic effects in synthetic sandstones." University of Western Australia. School of Oil and Gas Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0198.
Повний текст джерелаАнотація:
[Truncated abstract] This thesis describes the development of synthetic rock samples, representative of core samples from hydrocarbon reservoirs. The basic process consists of screening and sorting silica particles into discrete grain sizes, and then binding them together using a proprietary process known as CIPS, (Calcite In-situ Precipitation System). In the bonding process, the porosity of the system is substantially preserved, and the technique allows the manufacture of synthetic core samples with a tailor-made permeability. The produced samples were extensively characterised using a variety of analytic techniques to determine their porosity, permeability and pore size distribution. These analyses were a necessary pre-cursor to a major part of this thesis: the characterisation of the pore space by nuclear magnetic resonance (NMR) techniques. The synthetic core samples, covering a 7 times factor in grain sizes were examined using NMR, and this data formed the comparative basis for the NMR studies that followed. Two fundamental NMR questions were posed and answered in this thesis: 1. What is the effect of paramagnetic ions in the rock matrix on the NMR response? In pursuit of this question the CIPS process was extended to include co-precipitation of paramagnetic ions. A key feature is that the ions were deposited in predictable amounts at known sites (on the wall of the pore space). ... The NMR response in these double cores was then measured and examined to provide an answer to the question posed at the beginning of this paragraph. The significance of this work is that the physically distinct cores are a cylindrical analogue of adjoining sedimentary strata. By answering the question posed above, the thesis gives an indication of the vertical porosity resolution ultimately possible in an NMR logging tool. At present this ranges from 9” to 24” in the most favourable circumstances. This work suggests that the NMR signal carries porosity information at a much higher resolution, and that advanced numerical analysis of the NMR signature could realise the potential of greater stratigraphic resolution in NMR logging In addition to the research outlined above, the application of the CIPS technique to produce analogues of reservoir rocks, pioneered in this thesis, has stimulated similar research to be undertaken at other institutions, including the fabrication of synthetic reservoir cores containing clay particles (at CSIRO - the Commonwealth Scientific and Industrial Research Organisation) and a large scale application, formation of meter size blocks of CIPS bonded material, with separate strata, for laboratory studies of seismic waves (at Curtin University)
3
Trevizan, Willian Andrighetto. "Nuclear magnetic resonance and digital rock in oil industry: well logging applications." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-10082017-113902/.
Повний текст джерелаАнотація:
This thesis discusses Nuclear Magnetic Resonance (NMR) techniques for formation evaluation in well log analysis for the oil/gas industry. We present the standard ingredients for NMR data processing and interpretation, and develop a methodology that extends the determination of surface relaxivity from the laboratory to the well site. The methodology consists of a processing algorithm for diffusion editing data, which enables surface relaxivity determination for conditions close to those found in well logging (regarding data availability and noise levels). At moderate noise levels, lower relaxivity values (below 10μm/s) can be determined solely from NMR diffusion data, while higher values (∼30μm/s) can be separated from intermediate ones. Application for actual logging data still requires some noise reduction techniques such as stationary measurements downhole or data stacking among different depths. However, it provides a way of converting T2 distributions into actual pore size distributions even for downhole acquisitions, before the samples get to the laboratory for routine analysis. Besides the logging analysis, we also developed a theoretical approximation to the diffusion equation with partial absorptive contour conditions, by calculating appropriate transition rates between cells in an arbitrary grid, allowing a simple methodology for obtaining the NMR data based on pore imaging. Calculated rates can in principle be used for modeling/understanding different diffusion phenomena, such as exchange between pores or relaxation sites.Neste trabalho são discutidas técnicas de Ressonância Magnética Nuclear (RMN) aplicadas à avaliação de formações por meio da perfilagem de poços pela indústria de óleo e gás. São apresentados os conceitos básicos para processamento e interpretação dos dados de RMN, e desenvolvida uma metodologia para determinação da relaxatividade superficial em poço. O método consiste em um algoritmo de processamento de dados de diffusion editing, que permite a obtenção da relaxatividade superficial em condições próximas as encontradas na perfilagem de poços de petróleo (em relação à disponibilidade de dados e nível de ruído). Para níveis moderados de ruído, as relaxatividades mais baixas (menores que 10μm/s) podem ser determinadas através das medidas de difusão por RMN, enquanto valores mais altos (∼30μm/s) podem ser separados dos intermediários. Aplicações em dados de perfilagem ainda requerem técnicas de redução de ruído como aquisições estacionárias em poço ou empilhamento de dados ao longo de um intervalo de profundidades. Entretanto, o método possibilita uma forma de converter as distribuições de T2 em distribuições de tamanhos de poros ainda em poço, antes que as amostras sejam enviadas para o laboratório em análises de rotina. Além da perfilagem, foi desenvolvido também uma aproximação para a equação de difusão com condições de contorno absortivas, através de equações de taxas. A forma das taxas de transição permite o desenvolvimento de metodologias simples para obtenção dos dados de RMN através de imagens dos poros das rochas. As taxas de transição podem ser utilizadas também para a modelagem de outros fenômenos que envolvam difusão, como fenômenos de troca entre poros ou entre sítios com diferentes valores de relaxação.
4
Damion, Robin A. "Grassmann variables and pseudoclassical Nuclear Magnetic Resonance." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-214290.
Повний текст джерелаАнотація:
The concept of a propagator is useful and is a well-known object in diffusion NMR experiments. Here, we investigate the related concept; the propagator for the magnetization or the Green’s function of the Torrey-Bloch equations. The magnetization propagator is constructed by defining functions such as the Hamiltonian and Lagrangian and using these to define a path integral. It is shown that the equations of motion derived from the Lagrangian produce complex-valued trajectories (classical paths) and it is conjectured that the end-points of these trajectories are real-valued. The complex nature of the trajectories also suggests that the spin degrees of freedom are also encoded into the trajectories and this idea is explored by explicitly modeling the spin or precessing magnetization by anticommuting Grassmann variables. A pseudoclassical Lagrangian is constructed by combining the diffusive (bosonic) Lagrangian with the Grassmann (fermionic) Lagrangian, and performing the path integral over the Grassmann variables recovers the original Lagrangian that was used in the construction of the propagator for the magnetization. The trajectories of the pseudoclassical model also provide some insight into the nature of the end-points.
5
Alhwety, Nader H., Nawaf I. Sayedakram, Igor Shikhov, and Christoph H. Arns. "Rock-typing of laminated sandstones by nuclear magnetic resonance in the presence of diffusion coupling: Rock-typing of laminated sandstones by nuclear magnetic resonance in the presence of diffusion coupling." Diffusion fundamentals 22 (2014) 1, S. 1-7, 2014. https://ul.qucosa.de/id/qucosa%3A13474.
Повний текст джерелаАнотація:
In this work, the aim is to assess the relative import
ance of the impact of diffusional coupling on NMR measurements of saturated laminated sandstone numerically at the layer
scale to assess the feasibility of NMR rock-typing approaches. We use two 3D model structures based on a Boolean particle process, providing a range of structural to diffusion length ratios to explore the relationships between pore geometry, surface magnetic properties, and NMR transverse relaxation time. The influence of surface relaxivity and bulk
susceptibility contrast on T2 relaxation responses is tested for layered structures to improve the rock-typing methodology. An escalation in pore coupling is observed with decreasing bed
thickness as well as decreasing bulk susceptibility contrast and surface relaxivity the latter ones reducing the time available for pore coupling by reducing the effective relaxation rate.
When pore coupling is strong, the T2 distribution clearly misrepresents the underlying bimodal distribution of the different morphologies. Consequently, the bimodal relaxation time
becomes merged and the relative amplitude of the peaks fails to reflect the true morphologies of the models. Furthermore, we observed that in low noise conditions of numerical simulation
the effect of diffusional coupling on transverse relaxation may be misinterpreted for the regularization effect on ILT solution. In such cases, careful selection of Laplace inversion method is essential for effective rock-typing by NMR.
6
Samsonov, Sergey A., Stephan Theisgen, Thomas Riemer, Daniel Huster, and M. Teresa Pisabarro. "Glycosaminoglycan Monosaccharide Blocks Analysis by Quantum Mechanics, Molecular Dynamics, and Nuclear Magnetic Resonance." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-147183.
Повний текст джерелаАнотація:
Glycosaminoglycans (GAGs) play an important role in many biological processes in the extracellular matrix. In a theoretical approach, structures of monosaccharide building blocks of natural GAGs and their sulfated derivatives were optimized by a B3LYP6311ppdd//B3LYP/ 6-31+G(d) method. The dependence of the observed conformational properties on the applied methodology is described. NMR chemical shifts and proton-proton spin-spin coupling constants were calculated using the GIAO approach and analyzed in terms of the method's accuracy and sensitivity towards the influence of sulfation, O1-methylation, conformations of sugar ring, and ω dihedral angle. The net sulfation of the monosaccharides was found to be correlated with the 1H chemical shifts in the methyl group of the N-acetylated saccharides both theoretically and experimentally. The ω dihedral angle conformation populations of free monosaccharides and monosaccharide blocks within polymeric GAG molecules were calculated by a molecular dynamics approach using the GLYCAM06 force field and compared with the available NMR and quantum mechanical data. Qualitative trends for the impact of sulfation and ring conformation on the chemical shifts and proton-proton spin-spin coupling constants were obtained and discussed in terms of the potential and limitations of the computational methodology used to be complementary to NMR experiments and to assist in experimental data assignment.
7
Alhwety, Nader H., Nawaf I. Sayedakram, Igor Shikhov, and Christoph H. Arns. "Rock-typing of laminated sandstones by nuclear magnetic resonance in the presence of diffusion coupling." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-178510.
Повний текст джерелаАнотація:
In this work, the aim is to assess the relative import
ance of the impact of diffusional coupling on NMR measurements of saturated laminated sandstone numerically at the layer
scale to assess the feasibility of NMR rock-typing approaches. We use two 3D model structures based on a Boolean particle process, providing a range of structural to diffusion length ratios to explore the relationships between pore geometry, surface magnetic properties, and NMR transverse relaxation time. The influence of surface relaxivity and bulk
susceptibility contrast on T2 relaxation responses is tested for layered structures to improve the rock-typing methodology. An escalation in pore coupling is observed with decreasing bed
thickness as well as decreasing bulk susceptibility contrast and surface relaxivity the latter ones reducing the time available for pore coupling by reducing the effective relaxation rate.
When pore coupling is strong, the T2 distribution clearly misrepresents the underlying bimodal distribution of the different morphologies. Consequently, the bimodal relaxation time
becomes merged and the relative amplitude of the peaks fails to reflect the true morphologies of the models. Furthermore, we observed that in low noise conditions of numerical simulation
the effect of diffusional coupling on transverse relaxation may be misinterpreted for the regularization effect on ILT solution. In such cases, careful selection of Laplace inversion method is essential for effective rock-typing by NMR.
8
Mirijanian, James Julian. "Techniques to Characterize Vapor Cell Performance for a Nuclear-Magnetic-Resonance Gyroscope." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/724.
Повний текст джерелаАнотація:
Research was performed to improve the procedures for testing performance parameters of vapor cells for a nuclear-magnetic-resonance gyroscope. In addition to summarizing the theoretical infrastructure of the technology, this research resulted in the development and successful implementation of new techniques to characterize gyro cell performance.
One of the most important parameters to measure for gyro performance is the longitudinal spin lifetime of polarized xenon atoms in the vapor cell. The newly implemented technique for measuring these lifetimes matches results from the industry standard method to within 3.5% error while reducing the average testing time by 76% and increasing data resolution by 54%. The vapor cell test methods were appended with new software to expedite the analysis of test data and to investigate more subtle details of the results; one of the two isotopes of xenon in the cells tends to exhibit troublesome second-order effects during these tests due to electric-quadrupole coupling, but now the added analysis capabilities can accurately extract relevant results from such data with no extra effort. Some extraneous lifetime measurement techniques were explored with less substantial results, but they provided useful insight into the complex workings of the gyro cell test system.
New criteria were established to define the signal to noise ratio on a consistent basis from cell to cell across various parameters such as cell volume, temperature, and vapor pressure. A technique for measuring gas pressures inside the sealed cells helped link cell performance to cell development processes. This led to informed decisions on filling and sealing methods that consistently yielded cells with better performance in the last few months of this work. When this research began, cells with xenon lifetimes over ten seconds were rare in our lab; by the end, anything under 30 seconds was a disappointment. Not only did the test procedures improve, but so did the parameters being tested, and quite significantly at that. At the same time, many new avenues for continued progress have been opened; the work presented here, while instrumental, is only the beginning.
9
Urban, Jeffry Todd. "Nuclear magnetic resonance studies of quadrupolar nuclei and dipolar field effects." Berkeley, Calif. : Oak Ridge, Tenn. : Lawrence Berkeley National Laboratory ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2004. http://www.osti.gov/servlets/purl/836811-joXo6p/native/.
Повний текст джерелаАнотація:
Thesis (Ph.D.); Submitted to the University of California, Berkeley, CA (US); 21 Dec 2004.Published through the Information Bridge: DOE Scientific and Technical Information. "LBNL--56768" Urban, Jeffry Todd. USDOE Director. Office of Science. Office of Basic Energy Sciences (US) 12/21/2004. Report is also available in paper and microfiche from NTIS.
10
Sunter, Katherine Margaret. "Secondary structure determination of insect neuropeptides using high-resolution nuclear magnetic resonance and various molecular mechanics calculations." Master's thesis, University of Cape Town, 1996. http://hdl.handle.net/11427/17558.
Повний текст джерелаАнотація:
Includes bibliographical references.Insect neuropeptides play a vital role in the hormone release processes associated with insect flight Elucidation of the metabolic flight pathways requires a knowledge of the peptide secondary structure to allow predictions to be made regarding hormone-receptor binding processes. The three insect neuropeptides under investigation were taken from the corpora cardiaca of the migratory locust (Locusta migratoria) and belonged to the Lom peptide series - Lom-AKH-I, II and Ill. The secondary structure of these hormones was investigated using high-resolution nuclear magnetic resonance (NMR) techniques and various molecular mechanics computations. The interproton distances and φ torsion angles obtained from the NMR data were used to constrain the peptides in subsequent Monte Carlo and molecular dynamics (simulated annealing) calculations. The results of these calculations indicated that Lom-AKH-I and Lom-AKH-III adopt a definite structure in d⁶-DMSO solution, while Lom-AKH-II appeared to be fluctional with a minimum of three structures being required to satisfy the experimental data. Lom-AKH-I and ill were shown to adopt a loose open turn structures stabilised by the presence of a single hydrogen bond. Both had an additional concave structure with hydrophobic clustering on the convex surface of the molecule. The results suggest that Lom-AKH-I and Lom-AKH-III are more reactive than Lom-AKH-II. These predictions are in agreement with literature results obtained for Lom-AKH-I and II for lipid mobilisation and phosphorylase activation. However, when measured against cAMP production, Lom-AKH-II has higher activity. Insufficient literature was available to make structure/activity comparisons for Lom-AKH-III.
Книги з теми "Nuclear magnetic resonance; rock mechanics"
1
1950-, Scott P. R., ed. Energy levels in atoms and molecules. Oxford: Oxford University Press, 1994.
Знайти повний текст джерела
2
Rastelli, Enrico. Statistical Mechanics of Magnetic Excitations: From Spin Waves to Stripes and Checkerboards. World Scientific Publishing Co Pte Ltd, 2013.
Знайти повний текст джерелаЧастини книг з теми "Nuclear magnetic resonance; rock mechanics"
1
Caprihan, A., J. D. Seymour, S. A. Altobelli, and E. Fukushima. "Velocity Fluctuation Measurements of Granular Media in a Rotating Cylinder by Nuclear Magnetic Resonance Imaging." In Solid Mechanics and Its Applications, 153–61. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-015-9498-1_14.
Повний текст джерела
2
Pape, H., and C. Clauser. "Improved Interpretation of Nuclear Magnetic Resonance T1 and T2 Distributions for Permeability Prediction: Simulation of Diffusion Coupling for a Fractal Cluster of Pores." In Rock Physics and Natural Hazards, 949–68. Basel: Birkhäuser Basel, 2009. http://dx.doi.org/10.1007/978-3-0346-0122-1_10.
Повний текст джерела
3
Blinder, S. M. "Nuclear Magnetic Resonance." In Introduction to Quantum Mechanics, 243–63. Elsevier, 2004. http://dx.doi.org/10.1016/b978-0-12-106051-0.50021-1.
Повний текст джерела
4
Blinder, S. M. "Nuclear magnetic resonance." In Introduction to Quantum Mechanics, 315–35. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-822310-9.00026-4.
Повний текст джерела
5
Tian, Huihui, Changfu Wei, Xiaolong Xia, and Hui Wang. "Nuclear Magnetic Resonance assay of carbon dioxide hydrate in silt." In Unsaturated Soil Mechanics - from Theory to Practice, 177–80. CRC Press, 2015. http://dx.doi.org/10.1201/b19248-25.
Повний текст джерела
6
Thomas, Fabien, and Armand Masion. "27Al NMR Study of the Hydrolysis and Condensation of Organically Complexed Aluminum." In Nuclear Magnetic Resonance Spectroscopy in Environment Chemistry. Oxford University Press, 1997. http://dx.doi.org/10.1093/oso/9780195097511.003.0015.
Повний текст джерелаАнотація:
Aluminum is the most abundant metal of the Earth’s crust, of which it represents approximately 8%, ranking after oxygen and silicon. It exists mainly as oxides. In terrestrial environments, aluminum commonly exists as secondary (authigenic) hydroxide or aluminosilicate minerals, mainly clays. These minerals are highly insoluble at neutral pH. However, aluminum occurs in detectable amounts in natural waters, due to leaching of the soil minerals in acidic conditions. Soil acidity may have a natural origin, such as an acidic (silicic) mother rock, melted snow, dissolved carbonic acid, or biologically generated organic acids. During the past two decades, it has been demonstrated that one of the major origins of increased aluminum mobilization and transport in forested soils is introduction of strong acid through atmospheric sulfur and nitrogen deposition. It has also been shown that aqueous aluminum is the biogeochemical link between atmospheric pollution and damage caused to tree roots and aquatic organisms such as plankton, crustaceans, insects, and fish. Biological studies have shown that the different aluminum species exhibit various toxicities: the most toxic are the monomeric and the polynuclear species; complexation with organic acids results in low toxicity. The significance of aluminum to human health has long been regarded as negligible. There is a possible link between high-level aluminum contamination by renal dialysis or hemodialysis, and neurodegenerative health disorders such as Parkinson’s or Alzheimer’s diseases, but the part played by aluminum is not clear. However, since aluminum salts are used on an industrial level as coagulants and flocculants in water treatment, the aluminum concentration and speciation in drinking water deserve careful monitoring. Because of the specific toxicity of the aluminum species, there has been considerable concern in the past two decades over the speciation of aqueous aluminum present in soils and aquatic systems. To this end, several techniques have been developed in order to partition the aluminum species. The most common among them are chromatographic separation and categorization methods such as timed ferron reaction, and computational methods derived from thermodynamic equilibrium constants. However, significant discrepancies between the results have been noticed, and attributed to the dramatic interference of organic and inorganic anions in the Al fractionation.
7
Hoffmann, Rainer, and Paolo Colonna. "Evaluation of left ventricular systolic function and mechanics." In The ESC Textbook of Cardiovascular Imaging, 315–22. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780198703341.003.0023.
Повний текст джерелаАнотація:
Analysis of left ventricular (LV) systolic function is the most frequent indication to perform echocardiography and an integral part of cardiac magnetic resonance (CMR) or radionuclide studies. Visual estimation of LV function may be supplemented by quantitative analysis of 2D images to obtain parameters of global or regional function. Administration of contrast agents to improve identification of myocardium–blood interface has been demonstrated to improve the reproducibility of 2D-echocardiography-based analysis of LV function and should be applied in cases of insufficient endocardial border definition (more than two LV segments not adequately visualized). 2D-echocardiography-based analysis of LV volumes results in underestimation of end-systolic and end-diastolic LV volumes compared to CMR. 3D-echocardiography results in significantly less volume underestimation and higher accuracy in the analysis of ejection fraction. Analysis of regional wall motion is mainly based on subjective visual assessment, which is limited by significant inter-observer variability. Doppler tissue imaging and speckle tracking echocardiography have become validated methods for quantitative analysis of regional LV function. Similarly, tagging, strain-encoded cardiac magnetic resonance (SENC) and feature tracking are modalities to quantify regional LV function based on CMR. Echocardiography should be used as a primary technique to assess systolic LV function as it is the cheapest, widely available and can be applied without the use of ionizing radiation or nephrotoxic contrast material. CMR has become the clinical gold standard for quantification of LV function and may be applied if other information achievable best by CMR is required. Similarly, nuclear techniques should be applied to assess LV function only if simultaneous assessment of myocardial perfusion is requested.
8
Hoffmann, Rainer, and Frank A. Flachskampf. "Evaluation of systolic LV function and LV mechanics." In The ESC Textbook of Cardiovascular Imaging, edited by José Luis Zamorano, Jeroen J. Bax, Juhani Knuuti, Patrizio Lancellotti, Fausto J. Pinto, Bogdan A. Popescu, and Udo Sechtem, 497–506. Oxford University Press, 2021. http://dx.doi.org/10.1093/med/9780198849353.003.0034.
Повний текст джерелаАнотація:
Analysis of global and regional left ventricular (LV) function is the most frequent indication to perform echocardiography. While visual assessment based on 2D images is the basis for analysis of LV function, it may be supplemented by quantitative techniques to obtain parameters of global or regional function. 2D echocardiography tends to underestimate LV volumes compared to cardiac magnetic resonance (CMR), 3D echocardiography results in less volume underestimation and high accuracy in the analysis of ejection fraction. Visual analysis of regional function is limited by significant interobserver variability. Another approach to systolic LV function is the assessment of LV mechanics, typically by measuring global longitudinal deformation (strain) by speckle-tracking echocardiography. Alternatively, information on deformation can be obtained from CMR (currently, mostly by feature tracking). Deformation parameters detect early impairment of LV systolic function with higher sensitivity than ejection fraction. While echocardiography continues to be the first-choice modality for ejection fraction, CMR has become the gold standard for quantification of LV volumes and ejection fraction. Nuclear imaging should be applied to assess LV function only if simultaneous assessment of myocardial perfusion is requested.
9
Atkins, Peter. "7. Investigating matter." In Physical Chemistry: A Very Short Introduction, 106–20. Oxford University Press, 2014. http://dx.doi.org/10.1093/actrade/9780199689095.003.0007.
Повний текст джерелаАнотація:
Physical chemistry lies at the heart of one of chemistry's principal applications and achievements: the identification of the substances present in a sample and the determination of their abundances and structures. ‘Investigating matter’ considers how the laser and computer have elaborated and refined classical techniques. Various forms of investigative technique are explained including absorption spectroscopy and nuclear magnetic resonance. Mass spectrometry is widely used in organic chemistry to help identify compounds and photoelectron spectroscopy is used both to explore the energies with which electrons are bound inside molecules and to identify species on surfaces. The study of surfaces has been transformed by scanning tunnelling microscopy, which relies on quantum mechanics.
Тези доповідей конференцій з теми "Nuclear magnetic resonance; rock mechanics"
1
Isah, Abubakar, Abdulrauf Rasheed Adebayo, Mohamed Mahmoud, Lamidi O. Babalola, and Ammar El-Husseiny. "Characterization of Fluid Drainage Mechanism at Core and Pore Scales: an NMR Capillary Pressure–Based Saturation Exponent Prediction." In SPE Europec featured at 82nd EAGE Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/205176-ms.
Повний текст джерелаАнотація:
Abstract Capillary pressure (Pc) and electrical resistivity index (RI) curves are used in many reservoir engineering applications. Drainage capillary pressure curve represents a scenario where a non-wetting phase displaces a wetting phase such as (i) during gas injection (ii) gas storage in reservoirs (e.g. aquifer or depleted hydrocarbon reservoirs). The gas used for injection is typically natural gas, N2, or CO2. Gas storage principally used to meet requirement variations, and water injection into oil-wet reservoirs are drainage processes. Resistivity index (RI) curve which is used to evaluate the potential of oil recovery from a reservoir, is also an important tool used in log calibration and reservoir fluid typing. The pore drainage mechanism in a multimodal pore system is important for effective recovery of hydrocarbon reserves; enhance oil recovery (EOR) planning and underground gas storage. The understanding of pore structure and drainage mechanism within a multimodal pore system during petrophysical analysis is of paramount importance to reservoir engineers. Therefore, it becomes inherent to study and establish a way to relate these special core analyses laboratory (SCAL) methods with quick measurements such as the nuclear magnetic resonance (NMR) to reduce the time requirement for analysis. This research employed the use of nuclear magnetic resonance (NMR) to estimate saturation exponent (n) of rocks using nitrogen as the displacing fluid. Different rock types were used in this study that cover carbonates, sandstones, and dolomites. We developed an analytical workflow to separate the capillary pressure curve into capillary pressure curve for macropores and a capillary pressure curve for the micropores, and then used these pore scale Pc curves to estimate an NMR - capillary pressure - based electrical resistivity index - saturation (NMR-RI-Sw) curve for the rocks. We predicted the saturation exponent (n) for the rock samples from the NMR-RI-Sw curve. The NMR-based saturation exponent estimation method requires the transverse (T2) relaxation distribution of the rock - fluid system at various saturations. To verify the reliability of the new workflow, we performed porous plate capillary pressure and electrical resistivity measurements on the rock samples. The reliability of the results for the resistivity index curve and the saturation exponent was verified using the experimental data obtained from the SCAL method. The pore scale Pc curve was used to ascertain the drainage pattern and fluid contribution of the different pore subsystems. For bimodal rock system, the drainage mechanism can be in series, in parallel, or in series - parallel depending on the rock pore structure.
2
Hassan, Amjed Mohammed, Mohamed Ahmed Mahmoud, and Ayman Raja Al-Nakhli. "Mitigation of Gas Condensate Banking Using an Integrated Chemical Approach." In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/207665-ms.
Повний текст джерелаАнотація:
Abstract In gas reservoirs, the well production can be reduced due to the development and accumulation of condensate in the near-wellbore zone. Various techniques are used to minimize the condensate damage and maintain hydrocarbon production. Hydraulic fracturing and wettability alteration techniques are the most effective methods. However, these techniques are expensive, especially in deep gas reservoirs. This paper introduces a new approach for mitigating condensate accumulation by integrating the hydraulic fracturing and wettability alteration treatments. The efficiency of two chemicals that can generate multiple fractures and alter the fracture surfaces to less condensate status is investigated in this work. Thermochemical fluids and chelating agent solutions are used to mitigate the condensate damage and improve gas production for the long term. Several laboratory measurements were carried out to study the performance of the proposed approach; coreflooding, zeta potential, and nuclear magnetic resonance (NMR) experiments were conducted. The chemicals were injected into the tight rocks to recover the condensate and improve the flow conductivity. Zeta potential was performed to assess the rock wettability before and after the chemical injection. Moreover, the changes in pores network due to the chemical treatments as analyzed using the NMR technique. Thermochemical treatment removed around 66% of the condensate liquid, while the chelating agent reduced the condensate saturation by around 80%. The main mechanism for condensate removal during thermochemical flooding is the generation of micro-fractures that increase the rock permeability and improve the condensate flow. On the other hand, chelating agents can alter the rock wettability toward less oil-state, leading to considerable recovery of the condensate liquid utilizing a wettability alteration mechanism. Finally, an integrated approach is suggested to injecting thermochemical fluids followed by chelating agent solutions. The proposed technique can lead to generating micro-fractures of less oil-wet surfaces, consequently, the condensate bank can be removed by more than 90%.
3
Li, Shuai, Bo Cai, Chunming He, Yuebin Gao, Jia Wang, Fei Yan, Yuting Liu, et al. "Frac Fluid induced Damage in Tight Sands and Shale Reservoirs." In SPE International Conference and Exhibition on Formation Damage Control. SPE, 2022. http://dx.doi.org/10.2118/208873-ms.
Повний текст джерелаАнотація:
Abstract During the hydraulic fracturing of tight sands and shale reservoirs, ten thousands cubic meters of frac fluids were pumped into formation, while only 6-30% can be recovered. Frac fluids imbibed into formation matrix via capillary or forced pressure can cause formation damage, and this has been widely concerned. In this paper, we firstly reviewed and summarized the main damage mechanisms during the hydraulic fracturing of tight and shale reservoirs, including formation damage induced by fluids invasion, rock-fluids and fluids-fluids incompatibilities, proppants compaction and embedment, clay swelling and fines migration, chemical adsorption and particle dispersion et al. Secondly, we evaluated the formation damage via large-scale rock-block experiment (40cm×10cm×3cm cuboid size). Fluids invasion, water imbibition and flow-back process were carried out at the in-situ pressure condition to simulate the whole procedure of hydraulic fracturing. Liquid recovery and pressure profile obtained via the pressure detecting probes were used as evaluation method. What's more, nuclear magnetic resonance (NMR) methods were also used to illustrate the inner mechanism, explain the inside fluids distribution and fluids migration characteristics in different hydraulic fracturing procedure. Results showed that after frac fluid invasion, the rock permeability declined by 8-20%, and the hydrocarbon recovery decline by 25-30%, while the rock permeability can recover 3-12% after 24h's well shut-ins. Well shut-ins can increase rock permeability and this improvement is beneficial to hydrocarbon output in the later flow-back process. At the in-situ pressure condition, 4.3% more kerosene can be recovered than just at the spontaneous imbibition condition. Results also shows that invaded frac fluid forms a ‘water block’ and mainly distributes in macropores and mesopores and forms a water-block near fracture face, increasing capillary discontinuity and blocking seepage channels, while imbibition mechanism can reduce near-fracture water-blocks. A balance of displacement pressure and capillary pressure is crucial to the imbibition mechanism when considering in-situ pressure. The re-migration and distribution of the oil-water phase during the well shut-ins can weaken the water damage effect of the fracture wall, increase the relative permeability of the oil phase, and reduce the discontinuity of the capillary. Low fluids recovery after hydraulic fracturing would not all do harm to hydrocarbon recovery, sometimes it may help oil and gas extraction. Study of this paper can provide basis for oilfield field engineers to switch oil production choke and flow-back schedule management.
4
Gonzalez, Andres, Zoya Heidari, and Olivier Lopez. "Automated Rock Classification Using High-Resolution CT-Scan Images and Core Photos in a Siliciclastic Formation Used for CO2 Storage." In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/209979-ms.
Повний текст джерелаАнотація:
Abstract Carbon capture and storage (CCS) is an attractive alternative to reduce the concentration of greenhouse gases in the atmosphere with the objective of preventing further increases in global temperature. Accurate estimation of Petrophysical properties and detection of rock types are critical for the assessment of key aspects of CCS projects in geological formations such as storage capacity, injectivity, trapping mechanisms, and containment. The objectives of this paper are (a) to use whole-core computed tomography (CT) scan images and core photos, conventional well logs, nuclear magnetic resonance (NMR) logs, and core-measured properties for automated rock classification, (b) to develop class-based rock physics models for enhanced petrophysical properties estimation, and (c) to provide a method to expedite the detection of quantitative image-based rock classes. First, we conducted conventional formation evaluation for initial assessment of petrophysical properties. Then, we employed image analysis techniques to remove non-core material visual elements from the available image data (i.e., CT-scan images and core photos). Afterwards, we extracted rock-fabric related features from the available image data. We characterized the pore structure of the evaluated interval using NMR logs. We integrated conventional well logs and routine core analysis (RCA) data with image-based features and NMR pore structure parameters to automatically detected rock classes by means of a physics-based cost function. Finally, we updated the estimated petrophysical properties employing class-based rock physics models and compared the obtained result against conventional formation evaluation estimates. We applied the proposed workflow to the pilot well drilled in a saline water aquifer formation that will be used for CO2 injection and storage in the Northern Lights CCS project. The extracted image-based rock fabric features were in agreement with the visual aspect of the evaluated depth intervals. The detected rock classes captured the fluid-flow behavior using a permeability-based cost function, the variation in petrophysical and compositional properties trough well logs, and quantitative rock fabric of the evaluated depth interval through the core image data. Finally, the use of class-based rock physics models improved permeability estimates decreasing the mean relative error by 27% compared to formation-based permeability estimates from a conventional method (formation-based porosity-permeability correlations). One of the key contributions of the proposed workflow is that it integrates conventional well logs, core-measured properties, NMR logs, and high-resolution image data. As a result, the obtained integrated rock classes capture key petrophysical and geological parameters of the evaluated depth intervals that are typically not included in rock classification efforts. The obtained integrated rock classes can potentially improve the development of accurate geological models, which are employed in simulation efforts as a screening tool for selection of geological formations for CO2 storage as well as for storage capacity, selection of CO2 injection intervals, and containment forecasting.
5
Wang, Haijing, Boqin Sun, Zheng Yang, Scott Seltzer, and Marcus Wigand. "Accurate Rock Mineral Characterization with Nuclear Magnetic Resonance." In Unconventional Resources Technology Conference. Tulsa, OK, USA: American Association of Petroleum Geologists, 2019. http://dx.doi.org/10.15530/urtec-2019-19.
Повний текст джерела
6
Hossain, Zakir. "A relationship between rock physics and nuclear magnetic resonance." In SEG Technical Program Expanded Abstracts 2016. Society of Exploration Geophysicists, 2016. http://dx.doi.org/10.1190/segam2016-13970976.1.
Повний текст джерела
7
Dang, Son, Sanchay Mukherjee, Carl H. Sondergeld, and Chandra Rai. "Measurement of Effective Tortuosity in Unconventional Tight Rock using Nuclear Magnetic Resonance." In Unconventional Resources Technology Conference. Tulsa, OK, USA: American Association of Petroleum Geologists, 2021. http://dx.doi.org/10.15530/urtec-2021-5118.
Повний текст джерела
8
Marzouk, L. "Petrophysics and Nuclear Magnetic Resonance (NMR) Study of Low-Resistivity Pay in Lower Silurian Sandstone Reservoir." In Second EAGE Workshop on Rock Physics. Netherlands: EAGE Publications BV, 2014. http://dx.doi.org/10.3997/2214-4609.20132066.
Повний текст джерела
9
Ortiz, Alberto, Ana Licia Domingues*, and Mariane Santos Perez Andrade. "Reserves quantification and thin beds rock characterization applying Nuclear Magnetic Resonance and Resistivity simulations." In 11th International Congress of the Brazilian Geophysical Society & EXPOGEF 2009, Salvador, Bahia, Brazil, 24-28 August 2009. Society of Exploration Geophysicists and Brazilian Geophysical Society, 2009. http://dx.doi.org/10.1190/sbgf2009-269.
Повний текст джерела
10
Ortiz, Alberto, Ana Licia Domingues, and Mariane Santos Perez Andrade. "Reserves Quantification And Thin Beds Rock Characterization Applying Nuclear Magnetic Resonance And Resistivity Simulations." In 11th International Congress of the Brazilian Geophysical Society. European Association of Geoscientists & Engineers, 2009. http://dx.doi.org/10.3997/2214-4609-pdb.195.2060_evt_6year_2009.
Повний текст джерела