沾化凹陷沙三下亚段泥页岩孔隙类型及其影响因素  

Microscopic Pore Types and Their Influence Factors of Shale Oil Reservoirs in the Lower 3rd Member of Shahejie Formation in Zhanhua Sag

作　　者：李尊芝 张帆[2] 闫建平[1,2] 何旭 唐洪明[2] 耿斌[3] 扈勇[4] 

机构地区：[1]天然气地质四川省重点实验室,成都610500 [2]西南石油大学地球科学与技术学院,成都610500 [3]中石化胜利油田勘探开发研究院,东营257015 [4]中国石油集团测井有限公司长庆事业部,西安718500

出　　处：《科学技术与工程》2018年第2期33-41,共9页Science Technology and Engineering

基　　金：国家自然科学基金(41202110;51674211);四川省科技厅应用基础研究计划项目(2015JY0200);油气藏地质及开发工程国家重点实验室(西南石油大学)开放课题(PLN201612)资助

摘　　要：页岩储层有效性与孔隙类型及其发育程度关系密切。利用电镜、薄片、压汞等资料对沾化凹陷沙三下(Es_(3下))亚段泥页岩孔隙类型及其控制因素进行研究。结果表明,该层段主要发育黏土矿物晶间孔、黄铁矿重结晶孔、微裂缝和溶蚀孔隙,且不同类型孔隙发育所受的影响各不相同。然后结合纵向上划分的旋回和层序,分析泥页岩孔隙发育的规律,发现Es_(3下)亚段黏土矿物晶间孔和黄铁矿重结晶孔较发育,草莓状黄铁矿晶间孔仅发育于SQ2层序,且其大小随着湖平面的上升呈周期性减小的趋势;微裂缝与溶蚀孔作为有效的储集空间,前者主要发育在低位域,后者则多发育于较深地层,并以SQ1层序的湖侵体系域下部和低位域为主。该规律为在井筒剖面上寻找有利的泥页岩储层提供了依据。The effectiveness of shale reservoir and pore types and growth level have a close relationship.Using electron microscope,thin section,mercury injection,the pore types and controlling factors in shale reservoir of Es_3 Formation in south Zhanhua Sag.The results reveal that the clay intracrystalline pore,pyrite-recrystal pore,micro fractures and dissolved pore in the layer develop well,and the effects to developing of one pore type differ to another.Then combining the cyclic and sequence on vertical and analyzing the development rules of pore in shale,the results show that clay intracrystalline pore and pyrite-recrystal pore in Es_3 Formation develop well,strawberry pyrite-recrystal pore just develops in SQ2,and with the rise of lake level,its scale has the tendency to periodic decrease.Micro fractures and dissolved pores as the effective storage spaces,the former usually develop in low system tracts（LST）,while the latter develop in deep layers and mainly in lacustrine transgressive system tracts（LTST）and LST in SQ1.The law provides the basis for finding favorable shale reservoir in well profile.

关 键 词：泥页岩 孔隙类型 沾化凹陷 微裂缝 脆性矿物 低位域 

分 类 号：P631.84[天文地球—地质矿产勘探]