渤海湾盆地沾化凹陷沙河街组页岩油微观储集特征

发布时间：2018-05-20 19:14

本文选题：孔径 + 孔隙贡献　；参考：《石油实验地质》2017年02期

【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。
[Abstract]:The microscopic pore reservoir characteristics of shale oil reservoir is an important basic data for exploration and development. Taking 18 core samples from the third member of Shahejie formation, Shahejie formation, Zhanhua Sag, Bohai Bay Basin, the pore development characteristics of shale oil reservoir were studied by argon ion polishing and field emission scanning electron microscopy. The shale reservoir of the third member of Shahejie formation in Zhanhua depression is characterized by transitional lithology of mudstone and limestone, mainly composed of lime-mudstone, argillaceous limestone and marl bearing limestone, with a small amount of limestone thin layer. The main pore types of shale reservoir include micropores between shaly fragments and dissolution pores of carbonate minerals intergranular pores and intergranular pores. The porosity of shale reservoir is mainly provided by the muddy part, and the pore between the mud plasmids contributes the most, the calcite corrosion pore contributes to the porosity to some extent, and the intergranular pore and the intragranular pore contribute the least. The pore size of shale oil reservoir belongs to nanometer and micron, and the number of nanometer pore is dominant. However, the pore area of shale oil reservoir is mainly provided by a small number of micron pores. That is to say, the reservoir space of shale oil development should be micrometer pore as the main object.
【作者单位】：油气藏地质及开发工程国家重点实验室(成都理工大学);页岩气评价与开采四川省重点实验室(四川省煤田地质局);中国石化胜利油田分公司;
【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
【分类号】：P618.13

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