Process and Mechanisms of Deep Fluid Effects on Hydrocarbon Generation and Pore Space in Shale: A Case Study from the Mesoproterozoic Xiamaling Formation in the Zhaojiashan Section
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Process and Mechanisms of Deep Fluid Effects on Hydrocarbon Generation and Pore Space in Shale: A Case Study from the Mesoproterozoic Xiamaling Formation in the Zhaojiashan Section
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This work was jointly funded by the National Key R&D Program (2017YFC060302) and the National Natural Science Foundation of China (41872155, 41872164 and 42172168). We thank Prof. Zhang Shuichang, Dr. Wang Huajian and Dr. Wang Xiaomei of the PetroChina Research Institute of Petroleum Exploration and Development for their support in field section positioning and field discussion. We also thank Dr. Song Daofu of the China University of Petroleum (Beijing) for analysis and testing of TOC and rock pyrolysis.

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    Heat carried by deep fluid might greatly affect hydrocarbon generation and pore space in shale. Dyke intrusion carrying high levels of heat may be a means by which to explore the influence of deep fluid on shale reservoirs. This study evaluates hydrocarbon generation and analyzed the evolution of shale storage space in the third member of the Xiamaling Formation in the Zhaojiashan section, Hebei Province, based on experimental data such as TOC, SEM, VRo, low-temperature N2 adsorption and high-pressure mercury injection. The results show that the dyke intrusion reduced the shale TOC content drastically―by up to 77%―and also induced instantaneous hydrocarbon generation over a range about 1.4 times the thickness of the intrusion. Furthermore, the dyke intrusion might transform organic pores in surrounding shales into inorganic pores. There were two shale porosity peaks: one appeared when VRo = 2.0%, caused by the increase of organic pores as thermal maturity increased, the other occurred when the VRo value was between 3% and 4%, caused by the increase of inorganic mineral pores. It can be concluded that dyke intrusion can be an effective tool with which to study how deep fluid affects instantaneous hydrocarbon generation and pore space in shale.

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MENG Qingqiang, PANG Qian, HU Guang, JIN Zhijun, ZHU Dongya, LIU Jiayi, ZHANG Chuanwen.2022. Process and Mechanisms of Deep Fluid Effects on Hydrocarbon Generation and Pore Space in Shale: A Case Study from the Mesoproterozoic Xiamaling Formation in the Zhaojiashan Section[J]. ACTA GEOLOGICA SINICA(English edition),96(4):1342~1352

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  • 收稿日期:2022-02-17
  • 最后修改日期:2022-06-01
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  • 在线发布日期: 2022-08-29
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