石油勘探与开发2018，Vol.45Issue(2)：257-264,8.DOI:10.11698/PED.2018.02.08
特低渗砂岩储集层孔隙结构差异与低电阻率油层成因——以鄂尔多斯盆地中部烟雾峁区块为例
Pore structure differences of the extra-low permeability sandstone reservoirs and the causes of low resistivity oil layers: A case study of Block Yanwumao in the middle of Ordos Basin, NW China
摘要
Abstract
The influence of pore structure difference on rock electrical characteristics of reservoir and oil reservoir was analyzed taking Triassic Chang 6 reservoir in Block Yanwumao in the middle of Ordos Basin as an example.The relationship between the pore structure difference and the low resistivity oil layer was revealed and demonstrated through core observation,lab experiments,geological research,well log interpretation and trial production etc.The results show that there were two kinds of oil layers in Chang 6 Member,normal oil layer and low resistivity oil layer in the region,corresponding to two types of pore structures,pore type mono-medium and micro-fracture-pore type double-medium;the development of micro-fracture changed greatly the micro-pore structure of the reservoir,and the pore structure difference had an important influence on the rock electrical characteristics of the extra-low permeability sandstone reservoir and oil reservoir;the normal oil layers had obvious characteristics of pore-type mono-medium,and were concentrated in Chang 61,Chang 622 and Chang 623;the low resistivity oil layers had obvious characteristics of micro-fracture-pore type double-medium,which were mainly distributed in Chang 621 and Chang 63.The mud filtrate penetrated deep into the oil layers along the micro-cracks,leading to sharp reduction of resistivity,and thus low resistivity of the oil layer;the low resistivity oil layers had better storage capacity and higher productivity than the normal oil layers.关键词
鄂尔多斯盆地/长6油层组/特低渗储集层/低电阻率油层/孔隙结构/钻井液侵入/低电阻率成因Key words
Ordos Basin/Chang 6 oil layers/extra-low permeability reservoir/low resistivity oil layer/pore structure/mud invasion/low resistivity cause分类
能源科技引用本文复制引用
王建民,张三..特低渗砂岩储集层孔隙结构差异与低电阻率油层成因——以鄂尔多斯盆地中部烟雾峁区块为例[J].石油勘探与开发,2018,45(2):257-264,8.基金项目
陕西省自然科学基金项目(2010JM5003) （2010JM5003）
西安石油大学青年科技创新基金项目(2012BS010) （2012BS010）
