Experimental study of water imbibition characteristics of the lacustrine shale in Sichuan Basin  

作　　者：Changgui Jia Bo Xiao Lijun You Yang Zhou Yili Kang 

机构地区：[1]Sinopec Research Institute of Petroleum Engineering,Beijing,102206,China [2]State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Beijing,102206,China [3]Southwest Petroleum University,Chengdu,610500,China

出　　处：《Petroleum》2023年第4期572-578,共7页油气（英文）

基　　金：support from key scientific and technological project of Sinopec(No.P19025-1);the Natural Science Foundation of China(No.51674209);the Sichuan Province Youth Science and technology innovation team project(No.2021JDTD0017);the innovative research fund of postgraduates of Southwest Petroleum University(No.2020cxyb045)are greatly appreciated.

摘　　要：Through the stimulation method of large-scale hydraulic fracturing,the spontaneous imbibition capacity of the water phase in the shale reservoir has great influence on the effect of stimulation.Generally,the lacustrine shale has the characteristics of high clay minerals content,strong expansibility,development of nanopores and micro-pores,and underdevelopment of fractures,which leads to the unclear behavior of spontaneous imbibition of aqueous phase.The lacustrine shale of Da'anzhai Member and marine shale of Longmaxi Formation in Sichuan Basin were selected to prepare both the shale matrix sample and fractured shale sample,and the spontaneous imbibition experiment of simulated formation water was carried out.By means of an XRD test,SEM observation,nuclear magnetic resonance test and linear expansion rate test,the mineral composition,the structure of pores and fractures,the capacity of hydration and expansion of both lacustrine and marine shale are compared and analyzed.The results show that the average spontaneous imbibition rate of lacustrine shale is 60.8%higher than that of marine shale within the initial 12 hours of imbibition.The lacustrine shale has faster imbibition rate than the marine shale in the initial stage of spontaneous imbibition.However,the lacustrine shale has underdeveloped pores and fractures,as well as poor connectivity of pores.Besides,the strong hydration and expansion of clay minerals can easily lead to dispersion and migration of clay minerals on the fracture surface,which will plug up the seepage channels,resulting in poor capacity of spontaneous imbibition.The spontaneous imbibition rate in the middle and late stage of Lacustrine shale is obviously lower than that of the marine shale.The overall spontaneous imbibition rate ability of the lacustrine shale is less than that of the marine shale.According to the characteristics of water imbibition of lacustrine shale,considering the dual effects of hydration expansion of clay minerals on the effective reconstructed volume,the microfracture

关 键 词：Lacustrine shale Marine shale Water imbibition Clay minerals Hydration expansion 

分 类 号：P618.13[天文地球—矿床学]