天然气地球科学

• 天然气地质学 • 上一篇    下一篇

岩相构型对致密砂岩优质储层的控制作用——以川西坳陷须二段为例

印森林1,陈恭洋1,张玲2,罗迎春1,汪超平3,刘甜甜3   

  1. 1.长江大学录井技术与工程研究院,湖北 荆州 434023;
    2.中国石化西南油气分公司勘探开发研究院,四川 成都 610041;
    3.长江大学地球科学学院,湖北  武汉  430100
  • 收稿日期:2015-12-30 修回日期:2016-02-15 出版日期:2016-07-10 发布日期:2016-07-10
  • 通讯作者: 陈恭洋(1963-),男,湖北潜江人,教授,博士,主要从事油气地质勘探及录井地质研究与教学工作. E-mail:gychen8888@126.com.
  • 作者简介:印森林(1983-),男,湖北仙桃人,副教授,博士,主要从事储层沉积学及油气田开发地质研究. E-mail:yinxiang_love@qq.com.
  • 基金资助:
    国家自然科学基金项目(编号:41502126);长江大学青年基金项目(编号:2015cqn55);中国石油大学(北京)油气资源与探测国家重点实验室开放基金项目(编号:PRP/open-1510)联合资助.

The controlling effect of lithofacies architecture on high quality tight sandstone reservoirs:A case study of second member of the Upper Triassic of Xujiahe Formation, western Sichuan Depression,China

Yin Sen-lin1,Chen Gong-yang1,Zhang Ling2,Luo Ying-chun1,Wang Chao-ping3,Liu Tian-tian3   

  1. 1.Institute of Mud Logging Technology and Engineering,Yangtze University,Jingzhou 434023,China;
    2.Exploration and Development Research Institute of South-West Petroleum Branch Company,SINOPEC,
    Chengdu 610041,China;
    3.College of Geoscience,Yangtze University,Wuhan 430100,China
  • Received:2015-12-30 Revised:2016-02-15 Online:2016-07-10 Published:2016-07-10

摘要: 针对致密砂岩优质储层的沉积成因机制及其分布模式不完善的情况,拟探讨不同岩相构型叠置样式对致密砂岩优质储层的控制作用。利用野外露头、地震资料、样品分析化验资料、测井资料及生产测试资料,结合砂体结构分析法、沉积岩相分析法及岩相组合成因分析法等开展岩相构型控制下致密砂岩优质储层的分布模式研究。研究表明:①不同岩相构型揭示了不同的沉积环境。须家河组二段典型的岩相构型样式有5种,其与沉积亚相具有较好的对应关系。②岩相构型对储层质量具有重要的控制作用。取样分析揭示了块状层理细_粉砂岩孔隙度均值小于交错层理粉砂岩孔隙度均值,其中块状层理细_粉砂岩储层(河道主体)顶部孔隙度比底部及侧翼要高,交错层理粉砂岩储层(废弃河道)则表现为中心及底部孔隙度值高,其侧翼及其顶部孔隙度低。③岩相构型对含气性的控制作用明显。分层系数越高,含气性高产的可能性就越大,分层系数越低,水层的可能性越大。相变带及裂缝发育带是控制含气性的2个关键因素,相变带和裂缝发育带的耦合则是形成高产井气藏的必要条件。

关键词: 岩相构型, 须家河组, 致密砂岩气, 优质储层, 川西坳陷

Abstract: Deposition mechanism and distribution patterns of high quality tight sandstone reservoirs are not fully understood yet,so this study intends to discuss the controlling effect of stacking patterns of different lithofacies architectures on high quality tight sandstone reservoirs.By using outcrops,seismic data,physical property and logging and test data,the distribution patterns of high quality tight sandstone reservoirs controlled by lithofacies architecture have been investigated with sand body structure analysis,sedimentary lithofacies analysis,genesis analysis of lithofacies and lithofacies combinations methods.The research indicates:(1)Different lithofacies architectures suggest different depositional environments.There are 5 typical lithofacies architectures in the 2nd member of Xujiahe Formation,which correspond well with sedimentary subfacies. (2) The quality of reservoir is strongly controlled by lithofacies architecture.The analysis of samples shows that the average porosity of fine siltstone with massive bedding is lower than that of siltstone with crossing bedding,and the porosity of the top of fine siltstone reservoir with massive bedding (main part of channel) is higher than that ofits bottom and flank;whilefor siltstone reservoirs with crossing bedding,the center and bottom part have higher porosity than the flank and top(abandoned channel). (3)Lithofacies architecture has strong control over gas-bearing property.The higher the lamination factor,the higher the possibility of high gas productivity.The lower the lamination factor,the higher the possibility of water-bearing layer.Facies change zone and fracture developing zone are two key factors affecting gas bearing property,and the coupling offacieschange zone and fracture developing zone is the necessary condition for high production gas wells.

Key words: Lithofacies architecture, Xujiahe Formation, Tight sandstone gas, High quality reservoir, Western Sichuan Depression

中图分类号: 

  • TE122.2+1

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