Relevant bibliographies by topics / KOFA SANDSTONE

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Academic literature on the topic 'KOFA SANDSTONE'

Author: Grafiati
Published: 11 September 2023

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Journal articles on the topic "KOFA SANDSTONE"

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Nainggolan, T. B., M. P. Adhar, and I. Setiadi. "Integration of Post-stack Inversion and Rock Physics to Determine Sandstone Reservoir Quality: Barakan Sub-basin case." IOP Conference Series: Earth and Environmental Science 873, no. 1 (October 1, 2021): 012020. http://dx.doi.org/10.1088/1755-1315/873/1/012020.

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Abstract Barakan Sub-basin is assessed as potential basin for hydrocarbon reserves in the eastern region of Indonesia because it is adjacent to Masela block giant gas field. Reservoir rocks in this sub-basin are sandstones from Middle Jurassic (Lower Flamengo Formation) until Oligocene (Adi member Formation). Main sandstone reservoir rocks are knowingly studied to have good porosity in Upper Flamengo, Kopae, Ekmai and Adi member Formations. But, there is no significant study to determine sandstone reservoir distribution that have good porosity quality. Therefore, an integrated method of inversion and rock physics study are needed to determine sandstone reservoir quality. This study uses 2D marine seismic post-stack time migration and 2 wells namely Barakan-1 and Koba-1 wells. Sensitivity analysis with cross-plot of gamma ray log versus acoustic impedance values range of 20-60 API and 9000-42000 (ft/s)*(g/cc) shows a strong correlation of good porosity sandstone to low impedance in Ekmai Formation of both wells. Model based of post-stack inversion reveals sandstone distribution in Ekmai Formation of both wells. Time structure maps of top and bottom horizons in Ekmai Formation indicates Barakan-1 well within anticline height structure and Koba-1 well are deposited in a middle of sub-littoral environment.
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Soehady Erfen, Hennie Fitria Wulandary, Muhamad Azrin Asat, and Hardianshah Saleh. "GEOPHYSICAL APPLICATION FOR GROUNDWATER POTENTIAL AND WATER QUALITY ANALYSIS OF MELANGKAP AREA, KOTA BELUD, SABAH." Geological Behavior 6, no. 2 (2022): 57–60. http://dx.doi.org/10.26480/gbr.02.2022.57.60.

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The study area is located at Melangkap area of Kota Belud, Sabah, Malaysia which comprises of Crocker Formation aged Late Eocene to Early Miocene and Quaternary alluvium deposits. This study focuses on groundwater potential using electrical resistivity method and water quality analysis of the study area. Schlumberger array using ABEM Terrameter LS instrument and Res2DINC software is used for data acquisition. Three survey lines were conducted in Kg. Melangkap, Kg. Kebayau dan Kg. Tambatuon. Water samples from existing boreholes from these locations were analysed based on Drinking Water Standard by Malaysian Department of Environment. Subsurface interpretation showed the layer of shale with resistivity value of 20 – 40 ohm-m, fractured sandstone with 20 -175 ohm-m, interbedding of shale and sandstones with 60 – 500 ohm-m, saturated sandstones with 40 – 1000 ohm-m, thick sandstones with 500 – 1000 ohm-m and gravel deposits with 175 – 1000 ohm-m. Each survey line showed 3 zones of different materials. Kg Kebayau shows the best potential for groundwater supply than Kg Melangkap and Kg Tambatuon, due to existence of 12 m thickness of sandstone aquifer. Water quality analysis shows the heavy metals concentration for all samples are within permitted range for drinking water consumption. However, water sample from Kg Kebayau borehole has the lowest value of electrical conductivity, total dissolved solids, chloride content and heavy metals concentration made it the cleanest among all samples, which is widely used by the villagers of Kg Kebayau for drinking and external purposes.
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Alsabhan, Abdullah H., Md Rehan Sadique, Ali S. Alqarni, Shamshad Alam, and Wonho Suh. "Behavior of Sedimentary Rock Tunnel against Rigid Projectile Impact." Applied Sciences 12, no. 19 (September 24, 2022): 9595. http://dx.doi.org/10.3390/app12199595.

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The tunnels in present-day cities are experiencing varying degrees of loading conditions ranging from static to extreme loading. Therefore, the stability of underground tunnels needs to be analyzed and understood for safer and strengthened design. The present study was conducted to simulate the impact loading conditions due to a missile traveling at a velocity of 5 Mach for different rock tunnels. The nonlinear continuum finite element analysis has been carried out through Abaqus and Explicit. The four different types of sandstones considered in the present study include Kota, Jamrani, Singrauli, and Jhingurda sandstones. An elastoplastic Mohr–Coulomb constitutive material model has been considered to model the behavior of rock surrounding the tunnel opening. The tunnel has an opening of 7 m in diameter (d), and 50 m in height and breadth, with 50 m of longitudinal length. The deformation and stress in the rock and the damage to the concrete lining have been compared in different cases. The Concrete–Damage–Plasticity (CDP) model and the Johnson–Cook model were considered for modelling of the RC lining and steel reinforcement. It was concluded that Jhingurda sandstone has maximum deformations due to impacts caused by missiles.
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Alam, Md Shams, Tanusree Chakraborty, Vasant Matsagar, K. Seshagiri Rao, Prince Sharma, and Manjit Singh. "Characterization of Kota Sandstone Under Different Strain Rates in Uniaxial Loading." Geotechnical and Geological Engineering 33, no. 1 (September 5, 2014): 143–52. http://dx.doi.org/10.1007/s10706-014-9810-3.

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Sirajuddin, Haerany, and Sri Maulidani. "Analisis Profil Bawah Permukaan Pantai Lumpue Kota Parepare." Jurnal Penelitian Enjiniring 23, no. 2 (November 30, 2019): 186–94. http://dx.doi.org/10.25042/jpe.112019.13.

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Lumpue Beach Subsurface Profile Analysis of Parepare City. This study aims to analyze the subsurface profile of Lumpue beach which is directly contaminated with activities around the coast. In this study, the Wenner Schlumberger method was used in the Lumpue beach area, Perepare City, South Sulawesi Province. The tool used is a multichannel geoelectric with a maximum length of 480 m in each trajectory, in this study there are 3 trajectories in which the first trajectory is 480 m with depth as deep as 91.2 m and the resistivity results obtained range from 0.207 -> 97.8 Ωm which identified as alluvium containing clay soil, silt soil, sandstone and pyroclastic rock bolder that has been contaminated by sea water. At lane 2 intersects the middle lane 1 with a length of 240 m and identified depths of 91.2 m, the recorded resistivity results range between 5.52 -> 623 Ωm where the resistivity value identifies the alluvium material, which contains clay, silt soil , sandstone that has been contaminated with water and the presence of some pyroclastic rock inserts that are contaminated by water. Whereas lane 3 intersects lane 1 at the end with a lenght of 240m and a depth of 91.2 m, while the recorded resistivity results range from 0.354 - 11776 Ωm where from the recorded resistivity results the material contained in lane 3 is the inserted alluvium material. by pyroclastic rocks. The area covered by the track is an area with alluvium material which is an alluvial unit and most of it is contaminated by water, either by sea water or fresh groundwater and is inserted by pyroclastic rocks.
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Mubin, Mukhriz, Shamsudin Jirin, Zuhar Zahir Tuan Harith, Mohd Fauzi Abdul Kadir, Annur Asma Sayyidah Shamsuddin, and Ahmad Fitri Abdul Ghani. "Insights on deepwater turbidite sedimentary features from outcrops in onshore Northwest Sabah, Malaysia." IOP Conference Series: Earth and Environmental Science 1003, no. 1 (April 1, 2022): 012007. http://dx.doi.org/10.1088/1755-1315/1003/1/012007.

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Abstract This paper discusses findings of sedimentary features observed from deepwater outcrops in Northwest Sabah. The observations were based on 7 outcrop localities of Lower Oligocene – Upper Oligocene sections around Klias and Kudat Peninsulas, and Kota Kinabalu, covering Temburong, Belait, West Crocker, and Kudat formations. Temburong Formation (Lower Oligocene-Lower Miocene) was observed at Menumbok (Stop 1) and Tanjung Aru (Stop 2). It comprises interbedded shale and sandstone turbidite sequence representing deposition in deepwater setting. At Batu Luang (Stop 3) the deepwater turbidite Temburong Formation is observed overlain unconformably by stacked fluvial channel deposits of Belait Formation (Middle to Upper Miocene). Here, the overlying fluvial deposits comprise predominantly conglomerates which are believed to represent basal Belait Formation lies over regional unconformable surface correlatatable to Deep Regional Unconformity (DRU). Deepwater West Crocker Formation (Lower Oligocene-Lower Miocene) was observed at King Fisher-Sulaman, Kota Kinabalu (Stop 4), composed of predominantly thick sandstone interbedded with shale. Meanwhile, Sikuati Member of the Kudat Formation (Lower Miocene) was observed at Pantai Sikuati (Stop 5) and Bukit ‘V’ (Stop 6) outcrops. It consists of interbedded sandstone and shale of turbidite successions. At Tanjung Simpang Mengayau (Stop 7) thick sandstone interbedded with thin shales of Kudat Formation was observed. In general, the Temburong Formation at Stops 1 and 2 show Bouma sequence of Ta-Tb-Te successions, but relatively thicker Te at Stop 1 suggesting a prolonged mud suspension deposit compared to Stop 2. At Stop 3, the deepwater Temburong Formation was subjected to a substantial tectonic uplift and massive erosion associated with DRU. Further northwards at Stop 4 West Crocker Formation exhibits thicker Ta successions which implies deposition within a slightly higher energy regime as compared to that of Temburong Formation at Stop 3. Meanwhile, at Stops 5 and 6 different depositional energy levels are shown in the lower and upper stratigraphic intervals. In the lower interval deposition took place within a higher energy condition as shown by thick Ta. It was followed by gradual decreasing depositional energy regime in the upper interval as shown by predominance Tc-Td-Te. Meanwhile, at Stop 7 a thick massive graded sandstone overlain by thin mudstone bed was observed which implies a prolonged Ta succession followed by short-term Te of mud suspension deposits.
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Mohd Radzir, Nurul Afifah, Che Aziz Ali, and Kamal Roslan Mohamed. "Sedimentological Analysis of the Turbidite Sequence in the Northern Part of the West Crocker Formation, Northwest Sabah." Applied Sciences 12, no. 23 (November 28, 2022): 12149. http://dx.doi.org/10.3390/app122312149.

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Gravity-flow deposits form the northern part of the Crocker Formation (Oligocene–Early Miocene), with the most significant interpretation as a sand-rich system in the proximal and a mud-rich system in the distal area of the deep-water turbidite depositional setting. Seven outcrop localities in the northern-part area were selected for mapping and sampling, starting from Kota Kinabalu up to the Telipok area to evaluate the sedimentary sequence. This study used mapping, field observation, and log sketches in the field, as well as extensive analysis and interpretation of sedimentological methods to investigate the sequence of sediment outcrops in the Crocker Formation area of northwest Sabah. During the fieldwork, five main facies were found, namely, massive sandstone facies (f1), graded sandstone facies (f2), laminated sandstone facies (f3), interbedded sandstone and mudstone facies (f4), and mudstone facies (f5). These northern-part outcrops are interpreted as being deposited from the highest to the lowest turbidity currents and the actuality of pelagic mudstone deposition, based on their fining-coarsening-upward pattern. The five geometrical bodies were proposed as laterally contiguous depositional environments, namely, (1) inner fan channel, (2) inner fan channel–levee complex, (3) mid-fan channelized lobes, (4) non-channelized lobes/distal lobes, and (5) basin plains. The facies interpretation shows that the study area consists of lobes, channel–levee complexes, and levees formed in a fan of a deep-water basin setting, with the basinal plain enveloped by thick mudstone deposits. This northern part of the Crocker Formation is interpreted as a multiple-sourced sediment, shelf-fed, Type II, low-efficiency, and sand-rich turbidite depositional system.
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Cahyaningsih, Catur, Puja Fransismik Crensonni, Yogi Aditia, Adi Suryadi, Yuniarti Yuskar, Tiggi Choanji, and Dewandra Bagus Eka Putra. "Petrography, Geology Structure and Landslide Characterization of Sumatra Fault Deformation: Study Case In Km 10-15 Highway, Koto Baru Sub District, West of Sumatra." Journal of Geoscience, Engineering, Environment, and Technology 3, no. 4 (December 1, 2018): 192. http://dx.doi.org/10.24273/jgeet.2018.3.4.2062.

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Research area is around Tanjung Balik, Koto Baru Sub Base, Lima Puluh Kota District, West Sumatra Province. Located along the highway Km 10-15 Riau – West Sumatra and the coordinate around 00˚08'40 '' LU - 0˚11'20 '' N and 100˚45'20 '' BT - 100˚47'00 '' BT. The purpose of research to identify petrography, microstructure, types of landslides and the geological condition. The methods using polarization microscope, stereography, landslide identification survey and geological mapping. The result of study shows the petrography analysis of lithology of study area are classified into three types of rocks are Feldspathic Greywacke, Lithic Arenite, and Slate. Microstructures trending system show the foliation structure that is relatively Southeast-Northwest. Types of landslide which dominates in the research area are debris avalanche and translational landslide. Geological analysis show some of rock units are classified into two units: Sandstone Unit and Slate Unit. Sandstone Unit spread in the northern part of the study area, while Slate Unit spread in the southern part of the study area. The characteristics of these rocks showed Pematang Formation.
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Tating, Frederick, Robert Hack, and Victor Jetten. "Weathering effects on discontinuity properties in sandstone in a tropical environment: case study at Kota Kinabalu, Sabah Malaysia." Bulletin of Engineering Geology and the Environment 74, no. 2 (May 23, 2014): 427–41. http://dx.doi.org/10.1007/s10064-014-0625-5.

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Cahyaningsih, Catur, Tiggi Choanji, Yuniarti Yuskar, Dewandra Bagus Eka Putra, Fauzi Rahman, and Puja Fransismik Crensonni. "Landslide geomorphology evaluation and geology structure analysis at Riau-West Sumatra highway in km 89-94." MATEC Web of Conferences 276 (2019): 05011. http://dx.doi.org/10.1051/matecconf/201927605011.

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The research area is in the location hit by landslide frequently. Located in Riau-West Sumatra Highway in Km 89-94, Pangkalan Sub District, Lima Puluh Kota District, West Sumatra Province. The research objective to analyse the geomorphological conditions, which is relevance an increased vulnerability to landslides in the study area. The method used consist of geomorphology analysis using morphometric, morphography and morphogenetic parameters. The results of the analysis concluded that the geomorphology of the reserach area is classified into two: High Hills Steep Structural Geomorphology Unit (S2) dominates in all regions and Slightly Steep Hills Denudational Geomorphology Units (D3) is located in the Northeast, the percentages of distribution are 83%, and 17% respectively. Drainage pattern classified to parallel system. Lithology constituent consisting of claystone, siltstone, sandstone, and andesite. Structural geology analysis of joint show trend pattern to the Northwest -Southeast.
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Dissertations / Theses on the topic "KOFA SANDSTONE"

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KUMAR, JITENDER. "EFFECT OF BEDDING AND SHEARING PLANE ON SHEAR BEHAVIOUR OF SEDIMENTARY ROCK." Thesis, DELHI TECHNOLOGICAL UNIVERSITY, 2019. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18782.

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Shear strength is an important criterion while designing a structure over rock mass. This shear strength is significantly affected by the presence of joints or cracks. In sedimentary rocks there are discontinuities due to deposition of subsequent layers while formation. These discontinuities are called bedding planes and being the plane of weakness; these have a significant effect on the strength and deformation criterion. By keeping the above information in mind an organized laboratory investigation was planned to analyze the effect of these bedding planes on strength and deformation of rock mass. In this project, laboratory tests were performed for characterization of rock material, Kota sandstone, brought from Dabi mines, Kota, Rajasthan. Physical properties were evaluated by using the Indian Standards test procedures. Anisotropic effect due to presence of bedding plane was estimated by testing rock samples at different orientations, bedding planes being at angle to the loading direction. Oblique shear tests were performed for inducing fracture in rock sample and for estimating shear strength due to shear failure along a predetermined failure plane. Field shear tests were carried out on Kota sandstone to estimate shear strength due to sliding friction failure between fractured surfaces. This project mainly focuses on effect of a single parameter in particular affecting the strength: the angle between bedding plane and loading plane. Brazilian tensile strength tests were carried out to know the effect of tensile stresses on the mode of failure of rock material. Rock core samples were used for estimating physical properties and various strength tests were performed by following standard test procedures. Field shear tests were performed under constant normal load condition. Tests were conducted on air dried samples at room temperature for at least 15 days.
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Book chapters on the topic "KOFA SANDSTONE"

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Allibone, Andrew, David Lawrence, John Scott, Mark Fanning, James Lambert-Smith, Paul Stenhouse, Reinet Harbidge, Carlos Vargas, Rose Turnbull, and Joel Holliday. "Chapter 7: Paleoproterozoic Gold Deposits of the Loulo District, Western Mali." In Geology of the World’s Major Gold Deposits and Provinces, 141–62. Society of Economic Geologists, 2020. http://dx.doi.org/10.5382/sp.23.07.

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Abstract Paleoproterozoic (Rhyacian) gold deposits of the Loulo district in western Mali contain >17 million ounces (Moz) Au and form part of the second most highly endowed region within West Africa. The deposits are located within siliciclastic, marble, and evaporitic rocks of the ca. 2110 Ma greenschist facies Kofi series, which were folded and inverted between ca. 2100 and 2070 Ma, prior to gold mineralization. Deposits at Yalea and Gounkoto are located along discontinuous, low-displacement, albite- and carbonate-altered shear zones, whereas Gara is confined to a tourmaline-altered quartz sandstone unit. Lodes typically plunge gently to moderately, reflecting the attitude of folds in the adjacent rocks and bends in the host shear zones, both of which influenced their location. Gold mineralization in the Loulo district was broadly synchronous with emplacement of the Falémé batholith and associated Fe skarn mineralization, which intrude and overprint the western margin of the Kofi series, respectively. However, hydrothermal fluids generated during metamorphic devolatilization of the Kofi series rocks appear responsible for gold mineralization, albeit within a district-wide thermal gradient associated with emplacement of the Falémé batholith. The regional-scale Senegal-Mali shear zone, commonly cited as an important control on the location of gold deposits in western Mali, is absent in the Loulo district.
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