Shale gas potential of Ordovician marine Pingliang shale and Carboniferous–Permian transitional Taiyuan-Shanxi shales in the Ordos Basin, China

Nie, Haikuan; Chen, Q.; Li, P.; Dang, Wei; Zhang, J. C.

doi:10.1080/08120099.2023.2170466

Cited by 3 publications

(1 citation statement)

References 35 publications

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“…Among them, multiple sets of marine-continental transitional shale distributed in the Carboniferous-Permian system in the northern North China Basin are characterized by diverse kerogen types, large changes in organic matter abundance, high maturity, and medium clay abundance. They have become the current research hotspots for the exploration and development of shale gas [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Study on Sedimentary Environment and Organic Matter Enrichment Model of Carboniferous–Permian Marine–Continental Transitional Shale in Northern Margin of North China Basin

Zhang,

Wang,

Chen

et al. 2024

Energies

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The shales of the Taiyuan Formation and Shanxi Formation in the North China Basin have good prospects for shale gas exploration and development. In this study, Well KP1 at the northern margin of the North China Basin was used as the research object for rock mineral, organic geochemical, and elemental geochemical analyses. The results show that brittle minerals in the shales of the Taiyuan Formation and Shanxi Formation are relatively rare (<40%) and that the clay mineral content is high (>50%). The average TOC content is 3.68%. The organic matter is mainly mixed and sapropelic. The source rocks of the Taiyuan Formation and Shanxi Formation are mainly felsic, and the tectonic background lies in the continental island arc area. The primary variables that influenced the enrichment of organic materials during the sedimentary stage of the Taiyuan Formation were paleosalinity and paleoproductivity. Paleosalinity acted as the primary regulator of organic matter enrichment during the sedimentary stage of the Shanxi Formation.

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Section: Introductionmentioning

confidence: 99%

Study on Sedimentary Environment and Organic Matter Enrichment Model of Carboniferous–Permian Marine–Continental Transitional Shale in Northern Margin of North China Basin

Zhang,

Wang,

Chen

et al. 2024

Energies

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Lithofacies and Its Reservoir Characteristics of Marine–Continental Transitional Shales: A Case Study of Shanxi Formation in Eastern Ordos Basin

Xue,

Dang,

Zhang

et al. 2024

Energy Fuels

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Marine−continental transitional shale is a significant target for shale gas exploration and development in China. However, current research on the lithofacies and the geological characteristics of these transitional shales is limited, constraining efficient exploration and development in the future. This study examines the S 2 3 submember of the Permian Shanxi Formation in the Daning-Jixian area, which is located on the eastern margin of the Ordos Basin. To identify the various shale lithofacies types, we employed a series of experimental methods, including organic geochemistry, mineral composition analysis, thin-section identification, scanning electron microscopy, and gas adsorption, to systematically analyze the reservoir characteristics of these lithofacies. By integrating sedimentary structures, total organic carbon (TOC) content, and mineral components, we categorized the S 2 3 submember shale into 24 distinct lithofacies, of which 8 types are dominated. They are laminated organic-rich clay shale, laminated organic-rich siltstone, laminated medium organic-rich clay shale, laminated organic-poor clay shale, blocky medium organic-rich clay shale, blocky organic-poor clay shale, blocky organicpoor silty clay shale, and blocky organic-poor siltstone. These lithofacies show considerable variations in reservoir development characteristics, with laminated organic-rich clay shale demonstrating superiority in TOC content, specific surface area, pore diameter, and porosity, thereby emerging as the optimal lithofacies for shale gas exploration and development.

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Geochemical Characteristics and Hydrocarbon Generation Potential of Coal-Measure Source Rocks in Julu Sag

Wang,

Zhang,

Yang

et al. 2024

Processes

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To uncover the reservoir characteristics and enrichment law of coal-measure gas in Julu sag, Hebei Province, and achieve co-exploration and co-mining, it is necessary to conduct a comprehensive analysis. In this study, we investigated the characteristics of coal-measure gas accumulation in the Taiyuan Formation and Shanxi Formation in the Julu area. This was achieved by collecting data on coal-measure source rocks and organic geochemistry, which were then combined with regional geological conditions. This study indicates that the coal seams and shales of Shanxi Formation and Taiyuan Formation in the study area serve as the primary source rocks. The predominant macerals found in coal rock are vitrinite. Furthermore, the organic matter type present in shale is primarily categorized as type II2, with the organic matter maturity falling within the immature–mature stage. Based on the simulation results of tectonic-burial history, thermal evolution history, and hydrocarbon generation history in the study area, it is evident that the coal-measure source rocks experienced their first peak of hydrocarbon generation during the Mesozoic era as a result of deep metamorphism. Subsequently, the area experienced uplift and erosion, leading to the release of coal-bearing natural gas. Since the Paleogene period, the coal-bearing source rocks have undergone sedimentary burial and entered the secondary hydrocarbon generation stage, resulting in significant production of oil and gas. Based on the analysis of gas content, buried depth, source rock thickness, and sealing conditions in the study area, it is evident that the potential of coal-measure gas resources in the study area is primarily comprised of shale gas with supplementary coalbed methane. It can be inferred that the deeper areas within the study area hold greater exploration prospects.

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Shale gas potential of Ordovician marine Pingliang shale and Carboniferous–Permian transitional Taiyuan-Shanxi shales in the Ordos Basin, China

Cited by 3 publications

References 35 publications

Study on Sedimentary Environment and Organic Matter Enrichment Model of Carboniferous–Permian Marine–Continental Transitional Shale in Northern Margin of North China Basin

Study on Sedimentary Environment and Organic Matter Enrichment Model of Carboniferous–Permian Marine–Continental Transitional Shale in Northern Margin of North China Basin

Lithofacies and Its Reservoir Characteristics of Marine–Continental Transitional Shales: A Case Study of Shanxi Formation in Eastern Ordos Basin

Geochemical Characteristics and Hydrocarbon Generation Potential of Coal-Measure Source Rocks in Julu Sag

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