摘要
页岩油储层微观孔隙储集特征是勘探开发的重要基础资料。采集渤海湾盆地沾化凹陷罗69井沙河街组三段页岩油层段18块岩心样品,利用氩离子抛光—场发射扫描电镜实验,研究页岩油储层孔隙发育特征。沾化凹陷沙三段页岩油层段为泥岩和灰岩的过渡岩性,以灰质泥岩、泥质灰岩和含泥灰岩为主,夹少量灰岩薄层。页岩油层段主要孔隙类型包括泥质碎片间微孔和碳酸盐矿物的溶蚀孔、晶间孔和晶内孔。页岩油层段的储层孔隙主要由泥质部分提供,泥质粒间孔提供的面孔率贡献最大,方解石溶蚀孔对面孔率有一定贡献,晶间孔和晶内孔的面孔率贡献最低。页岩油储层孔隙的孔径属于纳米级和微米级,纳米级孔隙数量占绝对优势,然而储层孔隙面积主要由数量较少的微米级孔隙提供,即页岩油开发的储集空间应该以微米级孔隙为主要对象。
The microscopic pore characteristics ol shale oil reservoirs are important basic data lor exploration and development. Eighteen core samples were collected from the third member oi Shahejie Formation （ES3） in well Luo 69 in the Zhanhua Sag,Bohai Bay Basin, and were analyzed using argon-ion polishing Scanning Electron Microscopy （SEM） to discuss the pore development characteristics ol shale oil reservoirs. The shale oil layer in ES3 showed a tran-sitional lithology ol mudstone and limestone,dominated by limy mudstone,argillaceous limestone and mud bearing limestone,with minor thin layers ol limestone. Argillaceous inter-particle pores, carbonate dissolved pores, inter-crystal pores and intra-crystal pores are the main pore types ol the shale oil layer. Argillaceous pores provided most ol reservoir pores ol the shale oil layer. Most ol the plane porosity was argillaceous inter-particle pores, while calcite dis-solved pores made a smaller contribution and inter-crystal pores and intra-crystal pores were less important. The pore diameters ol shale oil reservoirs were classed as nano scale and micron scale,and the nano scale pores have an abso-lute dominance quantitatively. The reservoir pore area was mainly provided by non-dominant micro-scale pores, which should be locused on in shale oil exploration.
出处
《石油实验地质》
CAS
CSCD
北大核心
2017年第2期180-185,194,共7页
Petroleum Geology & Experiment
基金
国家重点基础研究发展计划(973计划)项目"陆相页岩油储集性能与流动机理"(2014CB239103)
中国石化重点科技攻关课题"页岩油开发基础研究"(P13059)联合资助
关键词
孔径
孔隙贡献
页岩油
沙河街组
沾化凹陷
渤海湾盆地
pore size
porosity contribution
shale oil
Shahejie Formation
Zhanhua Sag
Bohai Bay Basin
