新疆石油地质

›› 2015, Vol. 36 ›› Issue (5): 1-1.doi: 10.7657/XJPG20150505

• 论文 •    

鄂尔多斯盆地镇北油田长81油藏电阻率差异成因

冯 渊1，杨伟伟1，刘一仓2，王 晔1，焦廷奎1，张海波1   

  1. (1.中国石油 长庆油田分公司 a.勘探开发研究院;b.低渗透油气田勘探开发国家工程实验室,西安 710021;2.中国石油 长庆油田分公司 第十一采油厂,甘肃 庆阳 745000)
  • 出版日期:2019-01-01 发布日期:1905-07-15

Analysis on Causes of Reservoir Resistivity Differences of Chang81Reservoir in Zhenbei Oilfield, Ordos Basin

FENG Yuan1, YANG Weiwei1, LIU Yicang2, WANG Ye1, JIAO Tingkui1, ZHANG Haibo1   

  1. (1.PetroChina Changqing Oilfield Company, a.Research Institute of Exploration and Development, b.State Key Laboratory of Low Permeability Petroleum Exploration and Development, Xian, Shaanxi710021, China; 2.No.11Oil Production Plant, Changqing Oilfield Company, PetroChina, Qingyang, Gansu745000, China)
  • Online:2019-01-01 Published:1905-07-15

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摘要： 鄂尔多斯盆地镇北油田长81超低渗油藏电阻率差异较大，油藏西部电阻率明显小于油藏东部，部分油层电阻率甚至接近水层，使得西部油层难以识别，给油田开发带来一定难度。为此，对油藏东、西部储集层电阻率差异成因进行了研究。研究结果表明，造成该油藏西部电阻率明显偏低的主要原因是：油藏西部储集层地层水矿化度高于油藏东部；西部储集层中阳离子交换能力较强的伊利石和绿泥石含量更高，其附加导电作用较强；由于油藏西部储集层中吸附水分子能力强的黏土矿物含量高、储集层孔隙结构更为复杂以及成藏动力弱等因素，导致其束缚水饱和度偏高。这一研究成果，对超低渗低阻油藏的勘探与开发具有重要意义。

Abstract: The ultra?low permeability reservoir of Chang81 in Zhenbei oilfield of Ordos basin is characterized by distinct formation resistivity which in west part of the reservoir is obviously lower than that in east part, even part of it closes to that of aqueous layers, which allows the western reservoir’s pay zone to be difficultly identified and developed. This paper analyzed the genesis of the resistivity differences in this reservoir. The results show that the causes of lower resistivity in the western reservoir compared with the eastern reservoir include three aspects as below:1) The salinity of formation water in the western reservoir is higher than that in the eastern reservoir;2)the western reservoir contains higher content of illite and chlorite with stronger capacity of cation exchange and additional conductivity; and3) it contains higher clay minerals and more complex pore structures as well as weaker hydrocarbon accumulation dynamics, which result in higher irreducible water saturation in it. This could be of significance for exploration and development of ultra?low permeability reserfvoirs

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