Microstructures and Pore Structures of Naturally Deformed Shales: Significance for Shale Gas Exploration in the Complex Tectonic Areas of the Margin of the Sichuan Basin, South China

Lu, Z.; Zhu, H.; Hao, Y.; Shi, E.; Lu, Y.; Qi, Y.

Авторы: Lu Zeng, Zhu Hongjian, Hao Yuexiang, Shi Erxiu, Lu Yanjun, Qi Yu
Журнал: Energy and Fuels
Том: 37
Номер: 14
Год издания: 2023
Издательство: American Chemical Society
Местоположение издательства: United States
Первая страница: 10414
Последняя страница: 10425
DOI: 10.1021/acs.energyfuels.3c01539
Аннотация: Tectonic deformation is a significant modification process in the multiscale structure of shale. Understanding the naturally deformed shale gas reservoir properties plays a significant role in visualizing and quantifying gas migration pathways. Here, microstructure and pore structure investigations are performed using two types of marine shale (weakly deformed shale and strongly deformed shale) by a combination of thin section, scanning electron microscopy (SEM) imaging, mercury intrusion porosimetry, and low-pressure gas adsorption. The results show the following: (1) The tectonic deformation has a significant effect on the evolution of shale microstructures and pore structures. (2) The weakly deformed shales are representative of slightly deformed fine-grained shales and develop significant laminated structures without apparent tectonic deformation. (3) Original sedimentary fabrics and pore networks have been largely destroyed and changed in the strongly deformed shales, and the thin section and SEM images present a variety of deformation microstructures, such as microfold, microfault, and cataclastic flow, showing evidence for ductile, brittle, and brittle–ductile deformation, respectively. (4) Organic pores are existent and developed, but they are not the main pore type in both weakly and strongly deformed shale. Mineral pores and fracture pores are more developed in naturally deformed shales, and they can contribute to gas migration. (5) A combination of low-pressure gas adsorption and mercury intrusion porosimetry suggests that with increasing tectonic deformation, macropore volumes and fracture pores relatively increase. These results will provide a basis for understanding microstructural evolution and pore structure preservation in the complex tectonic areas at the margin of the Sichuan Basin.
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Microstructures and Pore Structures of Naturally Deformed Shales: Significance for Shale Gas Exploration in the Complex Tectonic Areas of the Margin of the Sichuan Basin, South Chinaстатья Исследовательская статья

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