Tectonic evolution and gas control analysis of the Upper Palaeozoic tight sandstone reservoirs in the Linxing area of the eastern Ordos Basin

Guo, Qiulin; Wang, Xuanyi; Yin, Shuai; Wu, Zhonghu

doi:10.1002/gj.4007

Cited by 8 publications

(4 citation statements)

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“…Vertical faults with small fault displacements are distributed in the Middle–Lower Triassic strata in the study area (Figure b). According to earlier research, the studied region experienced fault activity between the Jurassic and the Late Cretaceous and the timing of fault activity and gas formation is consistent. , This suggests that the migration of gas from the upper Carboniferous and lower Permian source rocks to the overlying Middle–Lower Triassic sandstones may have occurred along these vertical faults with small displacement.…”

Section: Discussionsupporting

confidence: 68%

“…The layer with >50% gas saturation in the study area is designated as a gas layer and is the most economically valuable target for development. ,, According to the statistics, the better the quality of the reservoir, the higher the gas saturation of the Middle–Lower Triassic gas reservoir is (Figure a). Almost all of the gas layers with >50% gas saturation are concentrated in the conventional sandstone layers (Figure b).…”

Section: Discussionmentioning

confidence: 99%

“…According to earlier research, the studied region experienced fault activity between the Jurassic and the Late Cretaceous and the timing of fault activity and gas formation is consistent. 69,70 This suggests that the migration of gas from the upper Carboniferous and lower Permian source rocks to the overlying Middle−Lower Triassic sandstones may have occurred along these vertical faults with small displacement. The layer with >50% gas saturation in the study area is designated as a gas layer and is the most economically valuable target for development.…”

Section: Gas Accumulation Mechanismsmentioning

confidence: 99%

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Characterizations of Middle–Lower Triassic Reservoir Quality and Gas Accumulations in the Northeastern Margin of the Ordos Basin, China

Wang

Liu

et al. 2023

Energy Fuels

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New Middle−Lower Triassic gas reservoirs were found in the eastern margin of the Ordos Basin, which provides new possibilities for gas exploration in the Ordos Basin. However, there are few relevant studies on these gas reservoirs. In this study, we use porosity−permeability measurements, optical light microscopy, scanning electron microscopy, mercury intrusion capillary pressure experiments, core-scale low-field nuclear magnetic resonance experiments, fluid inclusion analysis, burial history reconstruction, organic geochemistry data, and wireline log data to systematically investigate the reservoir quality and accumulation pattern of Middle−Lower Triassic gas reservoirs. The Middle−Lower Triassic sandstones are mostly lithic arkose, with a small amount of feldspathic litharenite. In comparison to the upper Paleozoic tight sandstone, the Middle−Lower Triassic sandstones exhibit a superior pore structure and increased porosity and permeability. A significant portion of the Middle−Lower Triassic sandstones can be referred to as "conventional sandstones" (porosities >12% and permeabilities >1 mD). The source rocks of the Middle−Lower Triassic gas reservoirs are most likely the upper Paleozoic coal and organic-rich mudstone, and the accumulation of natural gas occurred in the Early Jurassic to Late Cretaceous. The gas accumulation in the sandstones of the Middle−Lower Triassic reservoirs was mainly driven by buoyancy. The initiation and extension of vertical faults with small displacement in the northeast margin of the Ordos Basin enabled gas to move through the faults from the deep upper Paleozoic source rocks to the Middle−Lower Triassic reservoirs. Since gas accumulation relies on buoyancy, conventional sandstone layers with good reservoir properties are more likely to reach high gas saturation and are the primary targets for exploration and development.

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Section: Discussionsupporting

confidence: 68%

Section: Discussionmentioning

confidence: 99%

Section: Gas Accumulation Mechanismsmentioning

confidence: 99%

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Characterizations of Middle–Lower Triassic Reservoir Quality and Gas Accumulations in the Northeastern Margin of the Ordos Basin, China

Wang

Liu

et al. 2023

Energy Fuels

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“…The Ordos Basin is a large multicycle superimposed sedimentary basin (Dai et al, 2005;Ji et al, 2010;Zhang et al, 2019;Guo et al, 2020). According to the current structure of tectonic characteristics and evolution history, and basal characteristics, the basin is divided into six tectonic units: Yimeng uplift in the north, Weibei uplift in the south, Northern Shaanxi slope in the middle, Tianhuan depression and western margin thrust belt in the west, and Western Jinxi flexure fold belt in the east (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

Sedimentology and Paleoenvironmental Characteristics of Fine‐grained Sediments in Coal‐bearing Strata in the Eastern Ordos Basin: A Case Study of the Exploratory Well in the Zizhou Area

Guo

WANG³

et al. 2023

Acta Geologica Sinica (Eng)

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The continuously collected cores from the Permo‐Carboniferous coal‐bearing strata of the eastern Ordos Basin are essential for studying the hydrocarbon potential in this region. This study adopted sedimentological and geochemical methods to analyze the sedimentary environment, material composition, and geochemical characteristics of the coal‐bearing strata. The differences in depositional and paleoclimatic conditions were compared; and the factors influencing the organic matter content of fine‐grained sediments were explored. The depositional environment of the Benxi and Jinci formations was lagoon to tidal flat with weakly reduced waters with low salinity and dry‐hot paleoclimatic conditions; while that of the Taiyuan formation was a carbonate platform and shallow water delta front, where the water was highly reductive. The xerothermic climate alternated with the warm and humid climate. The period of maximum transgression in the Permo‐Carboniferous has the highest water salinity. The Shanxi Formation was deposited in a shallow water delta front with a brackish and fresh water environment and alternative weak reductiveness. And the paleoclimate condition is dry‐hot. The TOC content in fine‐grained samples was averaging 1.52%. The main controlling mechanism of organic matter in this area was the input conditions according to the analysis on input and preservation of organic matter.

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Development Characteristics of Fractures in the Upper Palaeozoic Along the Northeastern Edge of the Ordos Basin and Their Controlling Effects on Hydrocarbon Accumulation

Yin,

Xu,

et al. 2024

Geological Journal

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The northeastern edge of the Ordos Basin is characterised by low‐amplitude structures and the presence of intrusive rock bodies in the Upper Palaeozoic strata. Tectonic movements and stratal denudation during the Mesozoic and Cenozoic have resulted in the development of well‐defined and effective fractures in the area. However, the controlling role of fractures on the Upper Palaeozoic gas reservoirs is not yet clear. This paper uses the Linxing Block as a case study to conduct a comprehensive analysis of the role of fractures in controlling gas distribution. The study shows that the Upper Palaeozoic in this area is primarily characterised by the development of vertical fractures, which are of a tensile‐shear nature and have a low degree of filling. The formation and evolution of fractures are controlled by the generation of hydrocarbons, denudation, and tensile strain during the sedimentation‐erosion process. Tensile fractures are more likely to occur when the horizontal minimum principal stress is lower than the formation pressure during hydrocarbon generation. During the denudation process, the horizontal minimum principal stress in tight sandstone decreased, facilitating the formation of near‐vertical tensile fractures. At the same time, the strata also produce a stress tensor, with the reduction in sandstone strata being greater than that in mudstone strata. Ultimately, fractures are more developed in reservoirs with high brittle mineral (quartz and feldspar) content in the uplifted and sloped areas of low‐amplitude structures, which is favourable for the accumulation of natural gas. In contrast, fractures in the trough zones are usually underdeveloped, and fractures are extremely developed near the Zijinshan Pluton, which is detrimental to the preservation of natural gas.

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Tectonic evolution and gas control analysis of the Upper Palaeozoic tight sandstone reservoirs in the Linxing area of the eastern Ordos Basin

Cited by 8 publications

References 30 publications

Characterizations of Middle–Lower Triassic Reservoir Quality and Gas Accumulations in the Northeastern Margin of the Ordos Basin, China

Characterizations of Middle–Lower Triassic Reservoir Quality and Gas Accumulations in the Northeastern Margin of the Ordos Basin, China

Sedimentology and Paleoenvironmental Characteristics of Fine‐grained Sediments in Coal‐bearing Strata in the Eastern Ordos Basin: A Case Study of the Exploratory Well in the Zizhou Area

Development Characteristics of Fractures in the Upper Palaeozoic Along the Northeastern Edge of the Ordos Basin and Their Controlling Effects on Hydrocarbon Accumulation

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