鄂尔多斯盆地页岩油微观存储空间类型及其成因机制——以新安边油田安83区块长7为例  

Microscopic Storage Space Type of Shale Oil in Ordos Basin and Its Genesis Mechanism——Case in Point:Long 7 in An 83 Block of Xin'anbian Oilfield

作　　者：张宝辉 丁强 张静[2] 刘涛 路向伟 师永民[3] Zhang Baohui;Ding Qiang;Zhang Jing;Liu Tao;Lu Xiangwei;Shi Yongmin(The 6th Oil Production Plant,Changqing Oilfield Company,CNPC,Shaanxi,710200;Changqing Industrial Group Co.,Ltd.,PetroChina Changqing Oilfield Company,Shaanxi,710200;Peking University,Beijing,100871)

机构地区：[1]中国石油长庆油田分公司第六采油厂,陕西710200 [2]中国石油长庆油田分公司长庆实业集团有限公司,陕西710200 [3]北京大学,北京100871

出　　处：《当代化工研究》2021年第24期82-84,共3页Modern Chemical Research

摘　　要：与常规储层相比,微观孔隙结构复杂多样,影响着原油赋存状态和采收率。本文以长庆油田最早投入页岩油开发试验的新安边油田安83区块长7油层为例,通过大量岩心描述、薄片观察、扫描电镜和压汞实验分析等,将存储空间类型划分为残余粒间孔、粒内溶蚀孔、粘土矿物晶间孔,并对其占比、孔喉分布区间和连通关系及成因机制进行分析,认为粒内溶孔是主要的存储空间,残余粒间孔占比较少,大量的环边状绿泥石膜起到了渗流屏障作用,孔喉连通性差,水介质补充能量难以达到理想效果。这一认识对今后10亿吨页岩油储量经济有效动用和规模开发,优选开采方式具有一定的指导意义。Compared with conventional reservoirs,the complexity and diversity of microscopic pore structure affects the state of crude oil assignment and recovery rate here.In this paper,taking the Chang7 oil formation in An83 block of Xin'anbian oilfield,which was first put into shale oil development test in Changqing oilfield,as an example,the storage space types in the study area were classified into residual intergranular pores,intragranular dissolution pores,and clay mineral intergranular pores through a large number of experimental methods such as core observation,rock thin section,cast thin section,scanning electron microscopy,and mercury compression analysis,and their percentages,pore throat distribution intervals and connectivity relationships and genesis mechanisms were analyzed,concludes that the intra-grain solution pores are the main storage space,the residual inter-grain pores account for a relatively small proportion,a large number of ring-edge chlorite membranes act as a seepage barrier,the pore throat connectivity is poor,and it is difficult to achieve the ideal effect of water medium supplemental energy.This understanding is a guideline for the future development and economic and effective utilization of 1 billion tons of shale oil reserves on a large scale,and the preferential selection of extraction methods.

关 键 词：鄂尔多斯盆地 页岩油 非常规储层 储集空间类型 渗流屏障 

分 类 号：TE3[石油与天然气工程—油气田开发工程]