Evolution of pore structure during diagenesis and hydrocarbon generation of marine shale: the inspiration from thermal simulation experiments

被引：0
作者：
Luo W. [1 ,2 ,3 ]
Ma Z. [1 ,4 ,5 ]
Zheng L. [4 ,5 ]
Tan J. [1 ,2 ,3 ]
Wang Z. [1 ,2 ,3 ]
Ning C. [4 ,5 ]
机构：
[1] School of Geosciences and Info-Physics, Central South University, Changsha, 410083, Hunan
[2] Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Changsha, 410083, Hunan
[3] Hunan Key Laboratory of Nonferrous Resources and Geological Hazards Exploration, Changsha, 410083, Hunan
[4] Wuxi Institute of Petroleum Geology, Sinopec Petroleum Exploration and Production Research Institute, Wuxi, 214126, Jiangsu
[5] State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Wuxi, 214126, Jiangsu
来源：
Shiyou Xuebao/Acta Petrolei Sinica | 2020年 / 41卷 / 05期
关键词：
Fractal characteristics; Inhomogeneity; Marine immature shale; Nitrogen adsorption; Pore structure; Thermal simulation;
D O I：
10.7623/syxb202005003
中图分类号：
学科分类号：
摘要：
During the deposition and burial of shale, pore formation and evolution are synchronized with the diagenesis and hydrocarbon generation processes. To reveal the effect of diagenesis and hydrocarbon generation on the pore structure of shale, taking the Upper Cretaceous marine immature shale in the Western Canada Basin as the research object, this study carries out the thermal simulation experiments on the diagenesis and hydrocarbon generation of shale from immature to over-mature stages under the geological conditions, analyzes the microstructures of samples after thermal simulation using the high-resolution scanning electron microscope, and quantitatively analyzes the pore development characteristics and fractal dimensions of experimental samples using the liquid nitrogen adsorption-desorption experiment and the Frenkel-Halsey-Hill (FHH) model. The results show as follows. (1) During diagenesis and hydrocarbon generation, the pore structures of shale are complex and changeable, mainly developing mesoporous and macroporous, with the shape of wedge or parallel plate. (2) The specific surface area of pore is mainly contributed by micropores and mesopores with the diameter smaller than 15 nm in shale. (3) Organic matter abundance is not the main factor affecting the fractal characteristics of pores. There is a clear negative correlation between the fractal dimension of pore structure and the average pore size, the smaller the pore size, the poor the pore connectivity, and the more complex the pore structure. (4) The fractal characteristics of pores in different evolutionary stages are obviously different. The clay mineral transformation and mineral dissolution caused by hydrocarbon generation in the mature stage can greatly reduce the complexity of pore structure and surface, while the formation of a large number of organic matter pores in the mature stage can increase the roughness of pore surface and make shale have a high pore specific surface area. © 2020, Editorial Office of ACTA PETROLEI SINICA. All right reserved.
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页码：540 / 552
页数：12
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