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

• PETROLEUM EXPLORATION • Previous Articles

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 Published:2025-04-03

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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