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三塘湖盆地牛圈湖油田低孔特低渗储集层特征及形成机理

文静 杨明 齐韦林 姚孟多 侯全政

文静, 杨明, 齐韦林, 姚孟多, 侯全政. 三塘湖盆地牛圈湖油田低孔特低渗储集层特征及形成机理[J]. 石油实验地质, 2018, 40(2): 141-148. doi: 10.11781/sysydz201802141
引用本文: 文静, 杨明, 齐韦林, 姚孟多, 侯全政. 三塘湖盆地牛圈湖油田低孔特低渗储集层特征及形成机理[J]. 石油实验地质, 2018, 40(2): 141-148. doi: 10.11781/sysydz201802141
WEN Jing, YANG Ming, QI Weilin, YAO Mengduo, HOU Quanzheng. Characteristics and formation mechanism of low porosity and extra-low permeability reservoirs in the Niujuanhu oil field, Santanghu Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2018, 40(2): 141-148. doi: 10.11781/sysydz201802141
Citation: WEN Jing, YANG Ming, QI Weilin, YAO Mengduo, HOU Quanzheng. Characteristics and formation mechanism of low porosity and extra-low permeability reservoirs in the Niujuanhu oil field, Santanghu Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2018, 40(2): 141-148. doi: 10.11781/sysydz201802141

三塘湖盆地牛圈湖油田低孔特低渗储集层特征及形成机理

doi: 10.11781/sysydz201802141
基金项目: 国家科技重大专项“吐哈—三塘湖盆地岩性地层油气藏有利区带预测与目标优选”(2017ZX05001003-007)资助。
详细信息
    作者简介:

    文静(1983-),女,博士研究生,工程师,从事沉积学、储层精细描述工作。E-mail:wenjing1983426@163.com。

  • 中图分类号: TE122.2

Characteristics and formation mechanism of low porosity and extra-low permeability reservoirs in the Niujuanhu oil field, Santanghu Basin

  • 摘要: 三塘湖盆地牛圈湖油田西山窑组储集层埋深浅(小于2 000 m),储集层类型却属于低孔特低渗型。为揭示其储集层特征及形成机理,通过岩心观察、铸体薄片鉴定、常规高压压汞实验和电镜扫描等技术,结合区域构造资料分析,进行了储集层特征及低孔特低渗形成机理研究。结果表明:西山窑组储集层以长石岩屑砂岩为主,储集空间类型有原生粒间孔、溶蚀孔及裂缝。沉积、成岩和构造三重因素共同作用,造成了储集层低孔特低渗;西山窑组早期因为含煤地层的酸性环境导致碳酸盐胶结弱,颗粒间缺少支撑而发生较强烈的快速压实,同时沉积作用又从粒径大小和填隙物含量上控制着储集层原始物性特征,成岩过程中发生的压实作用致使减孔率达到18%,酸性环境还导致高岭石的大量形成、石英次生加大边的发育及晚期的含铁质碳酸盐胶结的发育,胶结减孔率为5%左右;构造应力形成的裂缝为后期溶蚀作用的发生提供了一定通道,但岩石已在早期压实作用下基本固结致密,且煤层厚度较薄、酸性流体含量不足,难以在小体积粒间大规模流动,溶解强度不大,导致对渗透率贡献很大的粗喉道较少,形成了低孔特低渗储集层。

     

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  • 收稿日期:  2017-05-18
  • 修回日期:  2018-01-10
  • 刊出日期:  2018-03-28

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