摘要
针对川中下侏罗统自流井组大安寨段致密油储层认识不清的问题,通过岩石化学分析数据统计、薄片观察,同时采用扫描电镜、高压压汞、CT扫描等高分辨测试手段和方法,对大安寨段致密油储层微观孔隙特征进行研究,发现储集空间以粒间溶孔、粒内溶孔、晶间微孔、有机质孔等次生孔隙为主,部分孔隙已被不同程度充填。利用CT扫描技术对储层致密灰岩微观孔喉三维模型重建,发现大量纳米级孔隙存在于储层基质内部,孔喉连通性差。根据压汞曲线形态及孔隙结构参数将大安寨段储层孔隙结构分为3种类型。压实作用、重结晶作用及沥青质充填等,在一定程度上降低了储层渗流有效性;次生微裂缝成为孔隙间良好通道,有效提高了储层渗流能力。大安寨段致密油储层孔隙结构复杂,基质内部纳米孔隙及广泛发育微裂缝的贡献应引起重视。
Based on the statistical analysis of lithological chemistry,thin section observation,SEM technique,high pressure mercury injection,CT scanning etc.,the microscopic characteristics of pores in the tight oil reservoir of Da'anzhai Section in the central Sichuan Basin are studied.It reveals that the diagenetic mineral compositions in the tight oil reservoir are affected by storage space of inter-granular dissolved pores,intracellular dissolved pores,inter-granular pores and organic pores,and some of the pores are filled up to varying degrees.CT scanning technique is used to reconstruct the 3D model of micro-pore throat in the reservoir dense limestone.It shows that a large number of nano-scale pores exist in the reservoir matrix with poorly developed pore throat connectivity.According to the mercury intrusion curve morphology and pore structure parameters,the pore structures of the Da'anzhai Section can be divided into three types.Compaction,recrystallization and asphaltene filling,reduce the effectiveness of reservoir flow?while the secondary micro fractures become a good channel connecting the pores,which effectively improve the reservoir seepage capacity.Since the pore structures in the tight oil reservoir of Da'anzhai Section are complex,the pores in the matrix and the well developed micro fractures in the rocks are potential accumulation space for the oil and gas.
作者
李博
刘红岐
王拥军
周华英
张艳梅
田杰
孙杨沙
LI Bo;LIU Hongqi;WANG Yongjun;ZHOU Huaying;ZHANG Yanmei;TIAN Jie;SUN Yangsha(School of Geosciences and Technology,Southwest Petroleum University,Chengdu 610500,China;Research Institute of Petroleum Exploration 8^Development,Beijing 100083,China;Gas Transmission Management Department,Southwest Oil Gas Field Company,PetroChina,Chengdu 610213,China;Operating Area in Cainan Oilfield of Xinjiang Oilfield Branch Company,Urumqi 830001,China)
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2018年第2期211-220,共10页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
国家科技重大专项(2016ZX05046-003)
关键词
致密油
孔隙结构
湖相碳酸盐岩
四川盆地
大安
tight oil
pore structure
lacustrine carbonate rocks
Sichuan Basin
Da'anzhai Section
