川东北城口地区筇竹寺组页岩流变对孔隙结构的影响

doi:10.7657/XJPG20220502

新疆石油地质 ›› 2022, Vol. 43 ›› Issue (5): 513-518.doi: 10.7657/XJPG20220502

川东北城口地区筇竹寺组页岩流变对孔隙结构的影响

于淑艳¹(), 汪洋¹, 冯宏业², 朱洪建³()

1.河南地矿职业学院地质矿产勘查系,郑州 451464
2.中国科学院大学地球与行星科学学院,北京 100049
3.燕山大学车辆与能源学院,河北秦皇岛 066000

收稿日期:2021-12-16 修回日期:2022-01-17 出版日期:2022-10-01 发布日期:2022-09-22
通讯作者: 朱洪建 E-mail:251748136@qq.com;zhj8641@163.com
作者简介:于淑艳（1984-）,女,内蒙古开鲁人,讲师,硕士,矿物学与岩石学,（Tel）13673625631（E-mail） 251748136@qq.com
基金资助:
国家自然科学基金(42102186);国家自然科学基金(41530315);河北省高等学校科学技术研究项目(BJK2022018)

Influences of Shale Rheology on Pore Structures of Qiongzhusi Formation in Chengkou Area, Northeastern Sichuan Basin

YU Shuyan¹(), WANG Yang¹, FENG Hongye², ZHU Hongjian³()

1. Department of Geology and Mineral Exploration, Henan Geology Mineral College, Zhengzhou, Henan 451464, China
2. School of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
3. School of Vehicles and Energy, Yanshan University, Qinhuangdao, Hebei 066000, China

Received:2021-12-16 Revised:2022-01-17 Online:2022-10-01 Published:2022-09-22
Contact: ZHU Hongjian E-mail:251748136@qq.com;zhj8641@163.com

摘要/Abstract

摘要：

为确定页岩天然流变对微观孔隙结构的影响,以川东北城口地区下寒武统筇竹寺组海相页岩为例,利用岩石薄片、聚焦离子束扫描电镜和低温液氮吸附实验,对页岩流变构造类型、特征、微观孔隙结构及其相互关系进行了研究。页岩流变的显微构造主要有碎斑系、碎裂流、压溶缝合线、显微褶皱、S-C组构和褶劈理;微米—纳米级构造包括糜棱岩化带、微型混杂带和旋转碎斑。天然流变页岩以发育纳米级矿物粒间孔隙为主,大部分原生孔隙结构在流变作用下难以保存;韧性流变导致页岩孔隙数量、孔径、孔体积、孔比表面积等减小,降低了页岩的储集性能。

关键词: 四川盆地, 城口地区, 寒武系, 邛竹寺组, 页岩流变, 孔隙结构, 页岩气藏

Abstract:

In order to determine the influence of natural rheology of shale on microscopic pore structure, taking the marine shale of the Lower Cambrian Qiongzhusi formation in the Chengkou area, northeastern Sichuan basin as an example, the types and characteristics of rheological structure and microscopic pore structure in the shale and their relationship were studied by using rock thin sections, focused ion beam scanning electron microscope and low temperature liquid nitrogen adsorption experiment. The microstructures of shale rheology mainly include porphyroclast system, cataclastic flow, pressolutional stylolites, microscopic fold, S-C fabric and crenulation cleavage, and the micro-nano structures include mylonite zone, micro-hybrid zone, and rotating porphyroclast. Rheological shale is dominated by nanoscale intergranular pores, and most of the primary pore structure is difficult to preserve under rheological action. Ductile rheology leads to a decrease in the number of pores, pore diameter, pore volume and pore specific surface area of shale, which reduces the storage performance of shale.

Key words: Sichuan basin, Chengkou area, Cambrian, Qiongzhusi formation, shale rheology, pore structure, shale gas reservoir

中图分类号:

TE122

于淑艳, 汪洋, 冯宏业, 朱洪建. 川东北城口地区筇竹寺组页岩流变对孔隙结构的影响[J]. 新疆石油地质, 2022, 43(5): 513-518.

YU Shuyan, WANG Yang, FENG Hongye, ZHU Hongjian. Influences of Shale Rheology on Pore Structures of Qiongzhusi Formation in Chengkou Area, Northeastern Sichuan Basin[J]. Xinjiang Petroleum Geology, 2022, 43(5): 513-518.

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川东北城口地区筇竹寺组页岩流变对孔隙结构的影响

Influences of Shale Rheology on Pore Structures of Qiongzhusi Formation in Chengkou Area, Northeastern Sichuan Basin

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