Sedimentation and mineralization of the Late Paleozoic
2021.6.15 The main strata are medium- to fine-grained quartz sandstone, fine-grained calcareous quartz sandstone, fine-grained feldspar quartz sandstone and minute
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Bi-Fractal Characterization of the Pore Network of
2021.11.30 The Xu2 tight sandstone is mainly medium to fine-grained lithic feldspathic sandstone or feldspathic lithic sandstone with low
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Quartz sandstone peak forest landforms of Zhangjiajie
2012.3.1 Quartz sandstone peak forest landforms of Zhangjiajie Geopark, northwest Hunan Province, China: Pattern, constraints and comparison Request PDF.
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Elastic rock properties analysis of diagenetic facies
Elastic rock properties analysis of diagenetic facies identification of deep tight sandstone in the Xihu Sag, China - ScienceDirect Available online 21 December 2023, 106661 In
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Integrated Diagenesis Study of Tight Gas Sandstone
2022.7.25 Core observation and grain size analyses show that Lower Shihezi tight sandstones range from pebble coarse sandstone, coarse sandstone, to fine sandstone
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Frontiers New geochronological and provenance
2023.1.6 The fine-grained sandstone mainly comprises quartz and feldspar grains that show angular shapes, reflecting low compositional and textural maturity . Additionally, the brick-colored fine-grained sandstone
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Fine-Grained Lithofacies Types and Sedimentary Model of
The Longtan coal-bearing strata are composed of complex lithological assemblages of fine-grained sedimentary rocks such as sandstone, coal, shale, and limestone, which exhibit
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Sedimentary environment and depositional evolution of the
2018.5.29 The North China Craton (NCC), one of the oldest cratonic plates on Earth, with rocks dating back to 3800 Ma, has long been a research focus of Precambrian
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Experimental study on capillary water absorption of
2022.2.15 Based on the varying range of grain size, YG, DZ and LS sandstones were characterized as coarse-grained lithic quartzose sandstone, fine-grained feldspathic
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Bi-Fractal Characterization of the Pore Network of
2021.11.30 1) The Xu2 tight sandstone is mainly medium- to fine-grained lithic feldspathic sandstone or feldspathic lithic sandstone with low porosity and permeability. Quartz is the dominating mineral (average
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Energies Free Full-Text Tight Sandstone Reservoir
2023.5.16 The findings indicate that the main rock type of the tight sandstone outcrop reservoirs in the Shanxi Formation in the Liujiang River Basin is lithic quartz sandstone, some of which contains fine sand-bearing argillaceous siltstone, giving them very low porosity (average porosity of 4.34%) and low permeability (average permeability of 0.023
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Diagenetic Facies and Their Controls on the
2023.5.23 The statistical study of sandstone minerals under the microscope shows that the lithology of the gas-bearing layer in Shan2 member is mainly lithic sandstone and lithic quartz sandstone, followed
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Clay mineral content, type, and their effects on pore throat
2020.5.1 It has been successfully exploited around the world and in China the estimated volumn of tight sandstone gas is more than 30 × 10 12 m 3 (Zou et al., 2010). ... Quartz content in fine-grained sandstone, medium-grained sandstone and sandy conglomerate samples vs. porosity; (B) Quartz content in fine-grained sandstone,
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Geomorphological and sedimentological comparison of
2010.12.18 The Zhangjiajie Sandstone Peak Forest Geopark (Zhangjiajie World Geopark) of northwest Hunan, China hosts a well-preserved sequence of fluvial terraces and karst caves. In this contribution, a comparative study of fluvial terraces with karst caves along the middle-lower Suoxi River in Zhangjiajie World Geopark is presented to improve
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Minerals Free Full-Text Tight Sandstone Reservoir
2021.12.3 Carboniferous-Permian petroleum resources in the Huanghua Depression of the Bohai Bay Basin, a super petroleum basin, are important exploration successor targets. The reservoir sedimentary environment of coal measures in the Upper Paleozoic buried hills is variable, and the structural evolution process is complicated, which restricts
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Diagenetic evolution of the Oligocene Huagang Formation in Xihu
2020.11.10 The Oligocene Huagang Formation (E 3 h) with buried depth from 2000 to 6000 m is a vital gas producing formation in the Xihu sag, East China Sea Basin 22,23,24.In the past five decades, lots of ...
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Frontiers The characteristics and genetic mechanisms of the
2023.1.17 1 China University of Petroleum (East China), Shandong, China; 2 Research Institute of Exploration and Development, Xinjiang Oil Company, PetroChina, China; In this paper, the lithology, pore type, throat structure, and physical characteristics of the sandstone and conglomerate reservoirs of the Upper Permian Shangwuerhe
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Influence of High-Temperature Treatment on Strength and
2022.5.5 The quartz-rich sandstone collected from Weiyuan County, Sichuan Province, western China, was processed for a total of 40 core samples, which were processed to rectangular shape according to ISRM processing accuracy standards with rectangular dimensions of 50 mm × 50 mm × 100 mm, and to control the surface flatness
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Experimental Study on the Effects of Stress Variations on the
2017.9.10 The China Geological Survey and the China Shenhua Group jointly launched a demonstration project of carbon dioxide geological storage in the Ordos Basin in 2010, and the Liujiagou formation is one of the target reservoirs. ... T. Xu, and J. Jing, “Experimental study on the variation of permeability of medium-fine feldspar-quartz
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Frontiers Automated mineralogy (SEM-EDS)
2022.7.27 Porosity and permeability define the reservoir quality of a sandstone. Porosity and permeability are controlled by primary sedimentary characteristics and subsequent diagenetic modification. Grain size,
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Preparation and Evaluation of Artificial Cores of ... - Springer
2020.9.28 Reservoir lithology is predominantly medium fine sandstone, fine sandstone, and powder fine sandstone that is composed of quartz, cuttings, and feldspar. ... We gratefully acknowledge the financial support of this work from the China Important National Science and Technology Specific Projects (2011ZX05024-002-005). ...
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Sedimentological Influence on Physical Properties
2021.2.24 Methodology. In this study, we obtained 35 rock samples of 4 cored wells (HN-20-1, HH75-X-4, QE37-14, and HF-5-2) at different depths. Using these rock samples, a large number of micro
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Experimental study on capillary water absorption of
2022.2.15 Sandstone grottoes, with their elaborate carvings and decorations, hold high historic, artistic and scientific values and therefore constitute an important part of China’s stone cultural heritage. Although capillary water accounts for severe pathologies at the grottoes, so far there have been limited comprehensive investigations concerned with
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Differences in hydro-chemical characteristics and genesis of sandstone ...
2020.5.20 The sandstone fissure aquifer of the Permian main mining coal seam is the direct water-filled aquifer of the coal mine in northern Anhui Province, China. Hydro-chemistry is important for solving the issue related to water disasters of coal mines, as it can be used for the determination of source of inrush water, and understanding the water
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Impact of rock type on the pore structures and physical
2020.5.21 The proven reserve of tight sandstone gas in China is approximately 3.5 × 10 12 m 3 with an annual production of 169 × 10 8 m 3, ... Among the pebbly sandstones, pebbly fine sandstone had the more quartz and metamorphic rock fragments, but less plagioclase. The non-pebbly sandstones showed similar compositions, except that
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Sedimentology and geochemistry of Carboniferous-Permian
2021.6.1 Medium-grained sandstone, white arrow shows erosional base with underlying shales, optical micrograph shows secondary enlargement of quartz (Q), 2137.3 m, Shanxi Formation; B. Medium-coarse sandstone with herringbone cross bedding, grain-size gradual fine-upwards, optical micrograph shows large quartz and siderite (SI),
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Sand-mudstone modeling of fluvial fan sedimentary facies: a
2022.4.13 The FX block is located in the northeast of the Ordos Basin in Central China (Fig. 1a). The FX41 area is approximately 16 km long from north to south and 25 km wide from east to west, covering an area of approximately 400 km 2 with a well spacing of approximately 2–2.5 km (Fig. 1b). The terrain of the entire study area is flat, and there
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Quartz Sandstone - an overview ScienceDirect Topics
11.2.3 Effect of grain hardness. The main mineral in sandstones, quartz, is fairly hard, with H=7. Feldspar is less hard (H ~ 6) and less abundant. The main phases in chondrules and chondrites have similar hardness: olivine with Fe/Mg~0.1 has H=7, whereas enstatite has H ~5, and iron has H ~4.5. However, iron is malleable, so the rounding ...
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Impacts of Sedimentation and Diagenesis on Deeply Buried
2022.8.28 The conglomerate is mainly fine gravel, and the composition is simple and primarily composed of polycrystalline. The structure of the conglomerate is from sub-angular to sub-circular. The types of sandstone are mainly composed of lithic quartz sandstone with a little part of feldspar quartz sandstone (Figure 7).
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Microscopic failure of yellow sandstone with different
2023.7.27 Firstly, the sandstone must be cut into thin sections and polished. The use of a geological microscope provides even further insight into the microstructure, mineral composition, and particle arrangement in the sandstones with different sized grains. Figure 1 indicates that the three sandstone specimens are mainly composed of quartz and ...
MoreInfluence of natural fractures on gas accumulation in the
2017.5.1 The Upper Triassic Xujiahe Formation in the northwestern Sichuan Basin, China, is a typical tight gas sandstone reservoir that contains natural fractures and has an average porosity of 1.10% and air permeability less than 0.1 md because of compaction and cementation. According to outcrops, cores and image logs, three types of natural
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Fine-Grained Lithofacies Types and Sedimentary Model of
The upper Permian Longtan Formation is widely distributed in southwestern China and is well known for multilayer coal and high organic shale, with significant shale gas potential that has yet to be fully explored and developed. The Longtan coal-bearing strata are composed of complex lithological assemblages of fine-grained sedimentary rocks such as
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Sedimentology, petrography, and reservoir quality of the
2021.1.12 For example, the detrital quartz content of the coarser grained sediments is higher ranging from 33.3 to 38.8% while the quartz in the fine-grained sediments is between 25.7 and 26.3%.
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Braided deltas and diagenetic control on tight sandstone
2022.6.15 The sandstone facies is mainly composed of gray to gray–green and light red coarse to fine sandstone, and can ... calcite, kaolinite, etc. They are relatively well developed in quartz sandstone and lithic ... Lower Shihezi Formation rocks. Quartz outgrowth is ubiquitous. Carbonate minerals are mainly spar calcite. According to China's ...
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Minerals Free Full-Text Diagenesis, Diagenetic Facies and
2023.3.14 The optimization of reservoir sweet spots is the key to the efficient exploration and development of low-permeability and tight sandstone gas reservoirs. However, offshore deep, low-permeability and tight sandstone has the characteristics of large burial depth, large diagenesis heterogeneity and prominent importance of
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Sedimentary and diagenetic characteristics of the Z21 field in
2022.3.31 A total of 6 depositional lithofacies were identified (Fig. 5), namely, massive fine- to medium-grained sandstone (Sm, Fig. 5A), ripple cross-laminated fine-grained sandstone (Sr, Fig. 5B ...
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Pore size distribution, their geometry and connectivity in
2019.9.25 Pore radii of coarse-grained sandstone and fine-grained sandstone range from 0.2 to > 4 µm and 1 nm to 1.60 µm, respectively, by MICP analysis. ... Beside quartz and feldspar, the sandstone consists of rock fragments and mica that has been identified by thin-section studies. ... Bai B, Zhang X, et al. Tight gas sandstone reservoirs in China ...
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Geochemistry and provenance of Mesozoic sandstones in
2023.4.26 U-Pb zircon dating was performed to determine the source of the Khorat Group sediment associated with the Qinling Belt in China and revealed that the age modes are 2456±4 Ma, 2001±4 Ma, 251±3 Ma, and 168±2 Ma [].Moreover, zircon fission tracks from sandstone on the west part of the Khorat Plateau were assessed to determine the
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Frontiers Study on the Microscopic Pore Structures of Coal
2022.5.16 The Carboniferous-Permian coal measures in China contain abundant natural gas resources. Shale, coal and tight sandstone reservoirs are developed in coal measures, and the quantitative characterization of the pore structures of different types of reservoirs can provide scientific guidance for the sweet spot prediction of tight reservoirs.
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