川东地区吴家坪组页岩储层孔隙结构及发育控制因素  

Pore structure and development control factors of shale reservoirs in Wujiaping Formation,eastern Sichuan Basin

作　　者：顾天甫 孙豪飞 张雪莹 陈世加[1] 路俊刚[1] 牟蜚声 陈骁[2] 袁乐欣 尹相东 GU Tianfu;SUN Haofei;ZHANG Xueying;CHEN Shijia;LU Jungang;MOU Feisheng;CHEN Xiao;YUAN Lexin;YIN Xiangdong(School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China;Exploration and Development Research Institute,Southwest Oil and Gas Field Company,PetroChina,Chengdu 610041,China;Chongqing Gas Field,Southwest Oil and Gas Field Company,PetroChina,Chongqing 401120,China)

机构地区：[1]西南石油大学地球科学与技术学院,四川成都610500 [2]中国石油西南油气田分公司勘探开发研究院,四川成都610041 [3]中国石油西南油气田分公司重庆气矿,重庆401120

出　　处：《断块油气田》2025年第1期1-9,共9页Fault-Block Oil & Gas Field

基　　金：国家自然科学基金项目“源储间泥/钙质等隔层对陆相致密油(低渗透油藏)成藏控制机理研究”(41872165);“烃源岩早期产物对致密油充注聚集的控制机理研究”(42072185)。

摘　　要：基于薄片和扫描电镜观察,结合TOC(总有机碳质量分数)测试、X射线衍射分析和低压气体吸附实验,明确了吴家坪组页岩储层的孔隙结构和发育影响因素。结果表明:1)吴一段和吴二段为黏土质页岩和混合页岩,吴三段为硅质页岩、钙质页岩和混合页岩。2)储集空间主要为裂缝、粒间孔和粒内孔,有机质孔规模较小,孔隙呈墨水瓶状和平板状或狭缝形孔;孔径以“多峰态、多尺度”特征分布于0.84~14.10 nm范围内,小于60 nm和10 nm的孔隙分别是总孔体积和比表面积的主要贡献者;页岩非均质性高,且孔隙内部非均质性高于孔隙表面。3)石英含量增加促进介孔发育,抑制微孔形成和增强非均质性,碳酸盐矿物含量增加不利于微孔与介孔发育,但增强储层非均质性,黏土矿物含量和TOC增加促进微孔的发育和增强储层的均质性。4)根据孔隙类型和矿物含量,将吴家坪组页岩分为黏土矿物含量高和脆性矿物含量高的裂缝￣无机孔隙型储层。Based on thin section and scanning electron microscope observation,combined with TOC(total organic carbon mass fraction)test,XRD and low pressure gas adsorption experiment,the pore structure and development factors of shale reservoir in Wujiaping Formation were determined.The results show that:(I)The Wu 1 and Wu 2 Member develop clay shales and mixed shales,and the Wu 3 Member develops siliceous shales,calcareous shales and mixed shales.(2)The reservoir space is mainly composed of fractures,intergranular pores and intra granular pores.The organic pores are small in scale,and the pores are inkbottle-like,flat plate-like or slit-like.The pore size ranges from 0.84 to 14.10 nm,and is marked by a"multi-peak and multi-scale"pattern,and pores smaller than 60 nm and 10 nm are the main contributors of pore volume and specific surface area,respectively.The heterogeneity of shale is high and the heterogeneity inside pores is higher than that on the surface.(3)The increase of quartz content promotes the development of mesoporous pores,inhibits the formation of micropores and enhances the heterogeneity,while the increase of carbonate mineral content is not conducive to the development of micropores and mesoporous pores but enhances the heterogeneity.The increase of clay minerals and TOC promotes the development of micropores and enhances the reservoir homogeneity.(4)According to pore type and mineral content,Wujiaping Formation shale can be divided into fractured-inorganic pore type reservoirs with high clay mineral content and high brittle mineral content.

关 键 词：页岩 孔隙结构 孔隙发育影响因素 吴家坪组 四川盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]