石油勘探与开发 >

2018 , Vol. 45 >Issue 2: 257 - 264

DOI: https://doi.org/10.11698/PED.2018.02.08

油气勘探

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

  • 王建民 ,
  • 张三
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  • 西安石油大学地球科学与工程学院,西安 710065
王建民（1962-）,男,陕西富平人,博士,西安石油大学教授,主要从事沉积、储集层、油气成藏及开发地质等方面的教学与科研工作。地址：陕西省西安市电子二路东段18号,西安石油大学地球科学与工程学院,邮政编码：710065。E-mail: wangjm@xsyu.edu.cn

收稿日期: 2017-06-29

  修回日期: 2018-02-25

  网络出版日期: 2018-01-17

基金资助

陕西省自然科学基金项目（2010JM5003）; 西安石油大学青年科技创新基金项目（2012BS010）

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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

  • WANG Jianmin ,
  • ZHANG San
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  • School of Earth Sciences and Engineering, Xi’an Shiyou University, Xi’an 710065, China

Received date: 2017-06-29

  Revised date: 2018-02-25

  Online published: 2018-01-17

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摘要

以鄂尔多斯盆地中部烟雾峁区块三叠系延长组长6油层组为例,通过岩心观察、实验分析、地质研究、测井解释、试采验证等,探讨孔隙结构差异对储集层及油层岩石电学特征的影响,论证并揭示了孔隙结构差异与低电阻率油层的成因关系。区内长6油层具有正常电阻率油层和低电阻率油层两种表现形式,发育孔隙型单孔介质和微裂缝-孔隙型双孔介质两种结构类型;微裂缝的发育极大地改变了储集层的微观孔隙结构,孔隙结构差异则对特低渗砂岩储集层及其油层的岩石电学特征产生了重要影响;正常电阻率油层具有明显的孔隙型单孔介质特征,主要集中于长61亚油层组和长622、长623小层,低电阻率油层具有明显的微裂缝-孔隙型双孔介质特征,主要集中于长621小层和长63亚油层组。钻井液沿微裂缝对油层形成了超深侵入,导致电阻率大幅降低及油层的低电阻率现象,低电阻率油层比正常电阻率油层具有更好的储产能力。图7表2参24

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

本文引用格式

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 . DOI: 10.11698/PED.2018.02.08

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.

Key words： Ordos Basin; Chang 6 oil layers; extra-low permeability reservoir; low resistivity oil layer; pore structure; mud invasion; low resistivity cause

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