四川盆地东南部五峰—龙马溪组海相页岩孔隙连通性实验研究  

Experimental study on pore connectivity of marine shale of Wufeng-Longmaxi Formation in Southeastern Sichuan Basin

作　　者：杨有东 肖磊 李连霞[3] 唐令[1,2] 梁志凯[1,2] 侯煜菲 王立伟 李卓 Yang Youdong;Xiao Lei;Li Lianxia;Tang Ling;Liang Zhikai;Hou Yufei;Wang Liwei;Li Zhuo(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;Institute of Unconventional Natural Gas Research,China University of Petroleum,Beijing 102249,China;Exploration and Development Research Institute,PetroChina Changqing Oilfield Branch,Xi′an 710018,China)

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油大学(北京)非常规油气科学技术研究院,北京102249 [3]中国石油长庆油田分公司勘探开发研究院,陕西西安710018

出　　处：《能源与环保》2020年第8期109-117,共9页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：“十三五”国家科技重大专项(2017ZX05035-002-006)。

摘　　要：五峰—龙马溪组富有机质页岩是我国海相页岩气商业开发的目的层,目前对该页岩孔隙连通性的认识仍不够深入。针对此问题,选取渝东南地区渝参6井五峰—龙马溪组的8个页岩样品开展了低压N2吸附、高压压汞和自发渗析实验研究。结果表明,研究区五峰—龙马溪组页岩中微孔、中孔和宏孔均发育,微孔和中孔占总孔体积的比例高,孔径的峰值分布于2~6 nm;五峰组页岩的MICP孔隙度、总孔体积和总孔比表面积均高于龙马溪组页岩,与样品有机质丰度差异相关;五峰—龙马溪组页岩样品的正癸烷(油润湿)自吸曲线斜率为0.254~0.428,去离子水(水润湿)自吸曲线的斜率为0.258~0.317。表明亲油性孔隙具有更高的孔隙连通性,而亲水性孔隙的连通性适中,五峰—龙马溪组页岩具有混合润湿特征,有机质孔隙的连通率高于无机矿物孔隙。Wufeng-Longmaxi Formation organic rich shale is the target layer for commercial development of marine shale gas in China.At present,the understanding of pore connectivity of the shale is still not deep enough.In order to solve this problem,eight shale samples from Wufeng-Longmaxi Formation of YC6 well in Southeast Chongqing were selected to carry out low pressure N2 adsorption,high pressure mercury injection and spontaneous dialysis experiments.The results showed that micropores,mesopores and macropores were well developed in Wufeng-Longmaxi Formation shale,and the proportion of micropore and mesopore in total pore volume was high,and the peak value of pore size distribution was 2~6 nm;micp porosity,total pore volume and total pore specific surface area of Wufeng Formation shale were higher than those of Longmaxi Formation shale.The slope of n-decane(oil wet) self absorption curve of Wufeng-Longmaxi Formation shale samples was 0.254~0.428,and that of deionized water(water wetting) was 0.258~0.317.The oil-bearing pores have higher pore connectivity,while the hydrophilic pores have moderate connectivity,and Wufeng-Longmaxi Formation shale has mixed wetting characteristics,and the connectivity of organic matter pores was higher than that of inorganic minerals.

关 键 词：五峰—龙马溪页岩 海相页岩 孔径分布 孔隙连通性 四川盆地 

分 类 号：TE135[石油与天然气工程—油气勘探]