Differences of shale pore structure characteristics under different tectonic deformation in Fuling shale gas field

doi:10.7623/syxb202503005

Acta Petrolei Sinica ›› 2025, Vol. 46 ›› Issue (3): 547-562.DOI: 10.7623/syxb202503005

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Differences of shale pore structure characteristics under different tectonic deformation in Fuling shale gas field

Yang Yang^1,2, Zhang Xiaoming³, Shi Wanzhong⁴, Qu Yang^1,2, Feng Qian⁴, Yu Cao^1,2

1. Exploration and Development Research Institute, Daqing Oilfield Limited Company, Heilongjiang Daqing 163712;
2. State Key Laboratory of Continental Shale Oil, Heilongjiang Daqing 163712, China;
3. School of Geology and Mining Engineering, Xinjiang University, Xinjiang Urumqi 830046, China;
4. School of Earth Resources, China University of Geosciences, Hubei Wuhan 430074, China

Received:2024-03-06 Revised:2024-09-30 Online:2025-04-03 Published:2025-03-25

涪陵页岩气区不同构造变形背景下页岩孔隙结构特征的差异

杨洋^1,2, 张晓明³, 石万忠⁴, 屈洋^1,2, 冯芊⁴, 余曹^1,2

1. 大庆油田有限责任公司勘探开发研究院黑龙江大庆 163712;
2. 多资源协同陆相页岩油绿色开采全国重点实验室黑龙江大庆 163712;
3. 新疆大学地质与矿业工程学院新疆乌鲁木齐 830046;
4. 中国地质大学资源学院湖北武汉 430074

通讯作者: 张晓明,男,1989年9月生,2020年获中国地质大学(武汉)博士学位,现为新疆大学地质与矿业工程学院教师,主要从事非常规油气地质的研究工作。Email:zxm@xju.edu.cn
作者简介:杨洋,男,1995年12月生,2022年获中国地质大学(武汉)硕士学位,现为大庆油田有限责任公司勘探开发研究院助理工程师,主要从事非常规油气储层方面研究。Email:yang1221@petrochina.com.cn
基金资助:
大庆油田有限责任公司科技专题项目“凉高山组页岩油有效开发技术研究”和新疆维吾尔自治区“天池英才”引进计划项目资助。

Abstract

Abstract: Tectonic deformation significantly affects the pore structure of shale. This study targets at the shale of Wufeng-Longmaxi formations in Well JY-C (stable tectonic region), Well JY-D (weak tectonic deformation region)and Well JY-B (strong tectonic deformation region)in Fuling shale gas field. By using the shale samples with similar mineral compositions, organic geochemical characteristics and diagenesis, the relationship between tectonic deformation and pore structures was investigated through low-temperature gas adsorption experiment, scanning electron microscope observation and image processing. The results show as follows. (1)Tectonic deformation will promote the development of intragranular pores and micro-fractures in shale reservoirs, and cause the intergranular pores to become smaller but have more types to a certain extent. (2)Tectonic deformation will cause an increase in macropore volume and proportion, and a decrease in the mesopore volume and proportion. The stronger the tectonic deformation is, the larger the pore volume changes. The weak tectonic deformation will increase the micropore volume and proportion, while the strong tectonic deformation will decrease the micropore volume and proportion. Weak tectonic deformation has little effect on the specific surface area and its proportion of micropores, while strong tectonic deformation will reduce the specific surface area of micropores, but has little effect on proportion of the specific surface area. (3)Tectonic deformation will deform the organic pores, resulting in a reduction of the roundness, surface density, and surface porosity of organic pores. The greater the strength of tectonic deformation, the greater the reduction degree. Compared with large-size organic pores, small-size organic pores are more resistant to deformation, and suffer from lower degree of deformation.

Key words: Sichuan Basin, shale, pore structure, tectonic deformation, Wufeng-Longmaxi formations

摘要： 构造变形会对页岩孔隙结构造成显著影响。以涪陵页岩气田稳定区JY-C井、弱变形区JY-D井和强变形区JY-B井的五峰组—龙马溪组页岩为研究对象,选取矿物组成、有机地球化学特征和成岩作用相近的样品,结合低温气体吸附实验、扫描电镜观察、图像处理等手段,研究构造变形与页岩孔隙结构的关系。研究结果表明:①构造变形会促进页岩储层中粒内孔和微裂缝的发育,并在一定程度上造成粒间孔变小但粒间孔类型增加。②构造变形会造成宏孔体积及宏孔占比增加、介孔体积及介孔占比减小,且随着构造作用越强,孔体积的变化幅度越大;弱构造变形会造成微孔体积及微孔占比增加,而强构造变形会造成微孔体积及微孔占比减小;弱构造变形对微孔比表面积及比表面积占比的影响不大,而强构造变形会造成微孔比表面积减小,但对微孔比表面积的占比影响不大。③构造变形会造成有机孔形变,导致有机孔圆度、面密度和面孔率减小,且构造变形强度越大,其减幅越大;小孔径有机孔相较于大孔径有机孔的抗形变能力更强,形变程度相对更小。

关键词: 四川盆地, 页岩, 孔隙结构, 构造变形, 五峰组—龙马溪组

CLC Number:

TE122.2

Yang Yang, Zhang Xiaoming, Shi Wanzhong, Qu Yang, Feng Qian, Yu Cao. Differences of shale pore structure characteristics under different tectonic deformation in Fuling shale gas field[J]. Acta Petrolei Sinica, 2025, 46(3): 547-562.

杨洋, 张晓明, 石万忠, 屈洋, 冯芊, 余曹. 涪陵页岩气区不同构造变形背景下页岩孔隙结构特征的差异[J]. 石油学报, 2025, 46(3): 547-562.

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Differences of shale pore structure characteristics under different tectonic deformation in Fuling shale gas field

涪陵页岩气区不同构造变形背景下页岩孔隙结构特征的差异

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[3]	Tian Hua, Zhao Xiaolin, Guo Xiaowen, Yuan Shengqiang, Li Zhiyun. Quantitative evaluation of shale oil in different occurrence states based on light hydrocarbon recovery: a case study of the Fengcheng Formation shale in Mahu sag,Junggar Basin [J]. Acta Petrolei Sinica, 2026, 47(5): 1014-1023.
[4]	Zeng Fanhui, Jiang Jing, Guo Jianchun, Zhang Yu, Liu Xiaohua. Gas mass transfer model accounting for shale anisotropic characteristics [J]. Acta Petrolei Sinica, 2026, 47(5): 1064-1079.
[5]	Sun Liang, Wei Chenji, Hu Zhe, Wang Daigang, Li Yunbo, Gao Yan, Han Rubing, Yang Jing. Characteristics of microscopic pore structure and oil displacement mechanisms of gas injection in low-permeability carbonate reservoirs in the Middle East [J]. Acta Petrolei Sinica, 2026, 47(5): 1110-1122.
[6]	Jiang Han, Xian Chenggang, Hong Haitao, Zhang Benjian, Zhao Rongrong, Huang Zisang, Qiu Yuchao, Zhou Hongfei, Han Luyuan. Breakthrough and implications of shale oil exploration in the Jurassic Lianggaoshan Formation at Well Lutan1 in Bashansi syncline of eastern Sichuan Basin [J]. Acta Petrolei Sinica, 2026, 47(4): 721-738.
[7]	Huo Lina, Jiang Fujie, Ma Yong, Jin Zhimin, Qin Changcai, Cao Liu, Zhang Xiutao, Feng Binhao, Yu Senxiuyuan, Wang Luyi, Cao Keji. Distribution characteristics and sensitive factors of movable fluids in micro-nano porous media:a case study of tight sandstone reservoir in the Member 4 of Xujiahe Formation in Jianyang area of Sichuan Basin [J]. Acta Petrolei Sinica, 2026, 47(4): 849-865.
[8]	Wang Wendong, Deng Yuxuan, Yuan Bin, Lei Zhengdong, Ke Can, Jia Feng, Su Yuliang. Energy management optimization for shale oil development driven by the integrated wind-photovoltaic-geothermal-grid energy system [J]. Acta Petrolei Sinica, 2026, 47(4): 934-946.
[9]	Bai Xuefeng, Lu Jiamin, Zhang Jinyou, Kang Dejiang, Wang Jinwei, Yu Dan, Liu Lijuan. Exploration breakthrough of interbedded shale oil in the Cretaceous Qingshankou Formation in northern Songliao Basin and its major significance [J]. Acta Petrolei Sinica, 2026, 47(3): 511-521.
[10]	Xiong Liang, Wei Limin, Feng Shaoke, Xiong Zhangkai, Li Nanying. Accumulation conditions as well as key exploration and development technologies of Yongchuan shale gas field in Sichuan Basin [J]. Acta Petrolei Sinica, 2026, 47(3): 692-705.
[11]	Wei Zhihong, Wei Xiangfeng, Shi Wenbin, Chen Chao, Liu Xiaojing, Wang Daojun, Wang Dongsheng, Shi Meijing. Geological characteristics and key exploration technologies of Fuxing oilfield in Sichuan Basin [J]. Acta Petrolei Sinica, 2026, 47(3): 706-720.
[12]	Shan Chang'an, Fei Yue, Liang Xing, Zou Chen, Shu Honglin, Wang Gaocheng, Zhang Zhao, Jiang Liwei, Rui Yun, Zhang Hanbing, Mei Jue, Zhang Chao, Gu Xiaomin, Shi Shiling. Comprehensive analysis of low-resistivity marine shale of Longmaxi Formation in Da’an area,western Chongqing: dominant role of water as well as other secondary factors [J]. Acta Petrolei Sinica, 2026, 47(2): 394-407.
[13]	Li Yong, Huang Meng, Lei Zhengdong, Yang Yang, Hou Lianhua, Hou Xiulin, Li Shuai, Hu Shuiqing, Wang Libin, Yang Lifeng, Dong Ruojing. Differentiated geoscience-engineering integrated development strategies for continental shale oil in China [J]. Acta Petrolei Sinica, 2026, 47(2): 437-454.
[14]	Zhao Jinzhou, Yang Junsong, Wei Bing, Wang Xiangzeng, Zhou Bo, Wang Lele, Zhang Xiang, Kadet Valeriy. Research progress and field practice of CO₂ utilization and storage in tight/shale oil and gas reservoirs [J]. Acta Petrolei Sinica, 2026, 47(1): 134-154.
[15]	Jiang Fujie, Zhang Chenxi, Chen Di, Zheng Xiaowei, Zhang Yuqi, Li Jijun, Fan Xiaoqi, Guo Tingwei, Wang Xiaohao, Hu Tao. Research status on oil content of continental shale and a new grading assessment method of resource potential [J]. Acta Petrolei Sinica, 2025, 46(9): 1661-1676.