Analysis of continental shale gas accumulation conditions in a rifted basin: A case study of Lower Cretaceous shale in the southern Songliao Basin, northeastern China

Tang, Ying; Yang, Runze; Zhu, Jianfeng; Yin, Shuai; Tang, Fan; Dong, Lu; Hou, Yunchao

doi:10.1016/j.marpetgeo.2018.12.002

Cited by 12 publications

(5 citation statements)

References 27 publications

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“…In recent years, many researchers have pointed out that the shale of the Y1 Member is mainly deposited in semi-deep to deep lacustrine facies, and the sedimentary facies of organic-rich shale is deep lacustrine facies, mainly distributed in the Y1 Member [23,41]. Based on the regional geological setting, lacustrine sediments developed during the sedimentary period of the Y1 Member.…”

Section: Sedimentary Facies Of Organic-rich Shalementioning

confidence: 99%

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The depositional settings of organic-rich shale in the faulted lacustrine basin: A case study of the Y1 Member of the Yingcheng Formation in the Songliao Basin

Lan,

Guo,

et al. 2024

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Volcanic activity is often associated with the development of faulted lacustrine basins. Organic-rich shale in such basins usually contains abundant volcanic material. The influence of volcanic input on organic-rich shale deposition in the basin studied has not been discussed in detail. Based on the ten shale samples from three wells, this study analyzed the depositional environment of the Yingcheng Formation shale in the Lishu Fault Depression area of the Songliao Basin by using interpretation of logging, total organic carbon analysis, gas chromatography mass spectrometry analysis, and trace element analysis. The impact of fault break to basement and volcanic materials on the organic matter enrichment was evaluated. The results show that the organic matter of Ying 1 (Y1), the First Member of the Yingcheng Formation, in the Lishu Fault Depression is characterized mainly by type I kerogen. The shale of the Y1 Member, having high total organic carbon content, is laterally continuous and could be considered as a potential target for shale oil exploration. The shale with high total organic carbon was deposited in a freshwater deep lake under an anoxic environment. There is a significant input of volcanic material, especially around the Su2 well near the Sangshutai Fault. This study has established a sedimentary model of organic-rich shale in the faulted lacustrine basin affected by volcanic activity, which has significance for the exploration of shale oil in faulted lacustrine basins.

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Section: Sedimentary Facies Of Organic-rich Shalementioning

confidence: 99%

“…The Lishu Fault Depression in the basin is rich in hydrocarbons, sourced from the shale of the Y1 Member. Previous studies have evaluated the organic geochemistry of the shale and identified it as oilprone [22,23]. However, the controlling factors of organic matter enrichment in this lacustrine shale are still unclear.…”

Section: Introductionmentioning

confidence: 99%

The depositional settings of organic-rich shale in the faulted lacustrine basin: A case study of the Y1 Member of the Yingcheng Formation in the Songliao Basin

Lan,

Guo,

et al. 2024

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“…As the main storage space and flow channel of natural gas in shale reservoirs, the pore and fracture structure of shale directly determine the storage and dissipation of shale gas. ,− The properties of pores, fractures, minerals, and organic matter (such as size, surface area, geometry, and connectivity) play an important role in defining the attributes and behaviors of shale reservoirs. − According to the pore size, the matrix pores of shale are categorized into micropores (<2 nm), mesopores (2–50 nm), macropores (50 nm-2 μm), and microfractures (>2 μm). − …”

Section: Shale Gas Experimentsmentioning

confidence: 99%

Recent Advances in Multiscale Digital Rock Reconstruction, Flow Simulation, and Experiments during Shale Gas Production

Yang

Zhang

et al. 2023

Energy Fuels

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The complex and multiscale nature of shale gas transport imposes new challenges to the already well-developed techniques for conventional reservoirs, especially digital core analysis. Multiscale complicated pore systems and distinctive properties limit most reconstruction methods not applicable. High-precision imaging experiments play a key role in the characterization of pore structures and mineral components. While the exhilarating breakthroughs in physical experimental methods and hybrid superposition methods have made significant achievements in shale digital rock reconstruction, rapidly evolving deep learning methods also present a promising option. Benefiting from the digital rock techniques, the pore-scale flow of shale gas can be directly simulated based on digital rock or indirectly modeled using the pore network model. It is precise and realistic to investigate the shale gas flow at the pore scale considering the desorption, surface diffusion, and slippage in nanopores. In this paper, we reviewed the recent advances in off-mentioned methods and processes and presented a hand for the research in this field.

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“…Kerogen has three major types: humic (type I), humic-sapropelic mixed (type II), and sapropelic (type III). Kerogen types determine the hydrocarbon generation characteristics, where type I has the strongest ability to generate oil, type III has the strongest ability to generate gas, and type II falls somewhere in between (Batten, 1996;Tang et al, 2019). Two methods are used to determine the types of organic matter, including type index (TI) analysis based on maceral compositions and carbon stable isotope analysis.…”

Section: Organic Matter Typementioning

confidence: 99%

Determination of Favorable Lithofacies for Continental Shale Gas: A Case Study of the Shahezi Formation, Changling Fault Depression, Songliao Basin

Yang

et al. 2022

Front. Earth Sci.

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In order to determine the optimum lithofacies for continental shale, the reservoir characteristics of different lithofacies types were studied based on a series of experiments. The lacustrine organic-rich shale of the Shahezi Formation is divided into siliceous (ORS), argillaceous (ORA), calcareous (ORC), and mixed (ORM) shales. The ORS, ORA, ORC, and ORM shales all carried out comprehensive reservoir comparative analysis. The results showed that the moderate content of clay minerals (45%) can significantly improve porosity, and high and low clay mineral contents are not conducive to the improvement of porosity. The ORM shale tends to have better pore connectivity than the ORS and ORA shales, and the ORC shale has the poorest pore-throat connectivity in micron-size. Internal pores in bitumen and clay shrinkage cracks are the dominant pore type and are well developed in ORS and ORM shales. The two types of pores are less developed in the ORA shale; however, dissolution pores are better developed than those of ORS and ORM shales. Inorganic pores are well-developed in the ORC shale, but organic pores are not. Organic and inorganic pores tend to be better connected in the ORM shale than those of the other three types, which could help improve the gas storage capacity. The ORM shale may have more irregular surfaces and lower liquid/gas surface tension. The higher capillary condensation on pore surfaces is more likely to occur in the ORA shale. The ORS shale offers fewer adsorption sites for CH4 and has lower adsorption capacity. The ORC shale has weak heterogeneity of the pore structure. Therefore, the ORM shale may be the most favorable lithofacies for shale gas enrichment and development, which has high porosity, good pore connectivity, moderate brittleness, and strong gas adsorption and storage capacity, followed by the ORS and ORA shales. The ORC shale is the worst.

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Analysis of continental shale gas accumulation conditions in a rifted basin: A case study of Lower Cretaceous shale in the southern Songliao Basin, northeastern China

Cited by 12 publications

References 27 publications

The depositional settings of organic-rich shale in the faulted lacustrine basin: A case study of the Y1 Member of the Yingcheng Formation in the Songliao Basin

The depositional settings of organic-rich shale in the faulted lacustrine basin: A case study of the Y1 Member of the Yingcheng Formation in the Songliao Basin

Recent Advances in Multiscale Digital Rock Reconstruction, Flow Simulation, and Experiments during Shale Gas Production

Determination of Favorable Lithofacies for Continental Shale Gas: A Case Study of the Shahezi Formation, Changling Fault Depression, Songliao Basin

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