4.6 Article

Pore structure evolution of lacustrine organic-rich shale from the second member of the Kongdian formation in the Cangdong Sag, Bohai Bay Basin, China

期刊

PETROLEUM SCIENCE
卷 19, 期 2, 页码 459-471

出版社

KEAI PUBLISHING LTD
DOI: 10.1016/j.petsci.2021.12.010

关键词

Lacustrine shale; Pyrolysis; Thermal maturity; Pore structure evolution; Hydrocarbon generation evolution

资金

  1. National Natural Science Foundation of China [42072150, 41372144]
  2. State Science and Technology Major Project of China [2017ZX05049001-008]

向作者/读者索取更多资源

Pyrolysis experiments were conducted on lacustrine organic-rich shale to investigate the impact of hydrocarbon generation on shale pore structure evolution. The results show that thermal evolution controls the transformation of organic matter, characteristics of hydrocarbon products, and changes in pore structure.
Pyrolysis experiments were conducted on lacustrine organic-rich shale from Cangdong Sag in Bohai Bay Basin, China, to investigate the impact of hydrocarbon generation on shale pore structure evolution. Thermal evolution is found to control the transformation of organic matter, hydrocarbon products characteristics, and pore structure changes. Furthermore, pore volume and specific surface area increase with increasing maturity. In low-mature stage, the retained oil content begins to increase, pore volumes show slight changes, and primary pores are occluded by the generated crude oil of high molecular weight and density. In the oil-window stage, the retained oil content rapidly increases and reaches maximum, and pore volumes gradually increase with increasing thermal maturity. At high mature stage, the retained oil content begins to decrease, and the pore volume increases considerably owing to the expulsion of liquid hydrocarbon. In over mature stage, natural gas content significantly increases and kerogen transforms to asphalt. Numerous organic pores are formed and the pore size gradually increases, resulting from the connection of organic pores caused the increasing thermal stress. This study lays a foundation for understanding variation of hydrocarbon products during the thermal evolution of lacustrine shales and its relationship with the evolution of shale reservoirs. ?? 2021 The Authors. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/ 4.0/).

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