石油与天然气地质 ›› 2017, Vol. 38 ›› Issue (4): 741-752.doi: 10.11743/ogg20170411

• 油气地质 • 上一篇    下一篇

四川盆地上震旦统灯影组微生物碳酸盐岩储层特征与主控因素

宋金民1, 刘树根1, 李智武1, 罗平2, 杨迪1, 孙玮1, 彭瀚霖3, 余永强1   

  1. 1. 成都理工大学 油气藏地质及开发工程国家重点实验室, 四川 成都 610059;
    2. 中国石油 勘探开发研究院, 北京 100083;
    3. 中国石油 西南油气田分公司 勘探开发研究院, 四川 成都 610051
  • 收稿日期:2016-07-10 修回日期:2017-07-05 出版日期:2017-08-28 发布日期:2017-09-09
  • 第一作者简介:宋金民(1983-),男,博士、副教授,碳酸盐岩沉积储层。E-mail:songjinmin@sohu.com。
  • 基金项目:
    油气藏地质及开发工程国家重点实验室开放基金项目(PLC201406);国家自然科学基金青年科学基金项目(41302086,41472107);国家重点基础研究发展计划(973计划)项目(2012CB214805);成都理工大学中青年骨干教师培养基金项目(10912-KYGG201505)。

Characteristics and controlling factors of microbial carbonate reservoirs in the Upper Sinian Dengying Formation in the Sichuan Basin,China

Song Jinmin1, Liu Shugen1, Li Zhiwu1, Luo Ping2, Yang Di1, Sun Wei1, Peng Hanlin3, Yu Yongqiang1   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
    2. Research Institute of Petroleum Exploration and Development, Petrochina, Beijing 100083, China;
    3. Research Institute of Petroleum Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu, Sichuan 610051, China
  • Received:2016-07-10 Revised:2017-07-05 Online:2017-08-28 Published:2017-09-09

摘要: 四川盆地上震旦统灯影组微生物碳酸盐岩主要发育在灯二段和灯四段。灯二段以凝块石和葡萄石为主,储集空间类型有葡萄-花边状孔洞、微生物体腔孔、微生物格架孔和凝块间溶孔;纵向上发育3个储层段,储层沥青集中发育在桐湾Ⅰ期不整合面之下117 m。灯四段则发育纹层石和叠层石,储集空间则以窗格孔和岩溶孔洞为主,辅以凝块间溶孔和微生物体腔孔;亦发育3个储层段,储层沥青发育在桐湾Ⅱ期不整合面之下134.2 m。四川盆地灯影组微生物岩储层形成和分布主要受控于浅水潮坪微生物席、微生物结构、白云石化和绵阳-长宁拉张槽。广布的浅水潮坪微生物席建造是优质储层发育的基础,微生物结构影响着储层的初始差异性,白云石化作用是微生物岩储层形成的关键,绵阳-长宁拉张槽控制下的风化壳岩溶和埋藏溶蚀作用决定了微生物岩优质储层的改造强度和展布,灯影组微生物岩优质储层主要分布于绵阳-长宁拉张槽东西两侧的边缘带。

关键词: 叠层石, 凝块石, 拉张槽, 微生物席, 微生物岩, 灯影组, 上震旦统, 四川盆地

Abstract: Microbial carbonates dominate the 2nd and 4th members of the Dengying Formation in the Upper Sinian,Sichuan Basin.The 2nd member contains mainly thrombolites and grapestones with botryoidalis pores,microbe visceral pores,microbe framework pores,inter-clot dissolved pores as reservoir space.Vertically,there are three reservoir intervals with bi-tumen concentrated 117 m below the unconformity of the first stage of the Tongwan movement.The 4th member contains largely laminites and stromatolites,with fenestral pores and karst pores as the main reservoir spaces and inter-clot dissolved pores and microbe visceral pores as the minor reservoir spaces.Three reservoir intervals occur in the member with bitumen concentrated 134.2 m below the unconformity of the second stage of the Tongwan movement.The development and distribution of microbial carbonate reservoirs in the members are suggested to be controlled mainly by shallow water tidal microbial mat,microbial structures,dolomitization and Mianyang-Changning intracratonic sag. The widespread mat might be the foundation of high-quality reservoirs,the microbial structures be the cause of the original reservoir diffe-rences,the dolomitization be the key to the formation of the reservoirs,and the weathering karst and burial dissolution controlled by the Mianyang-Changning intracratonic sag be the determinative factor for the modification and distribution of the reservoirs.And it is predicted that high-quality reservoirs in the Formation be along both sides of the margin area of Mianyang-Changning intracratonic sag.

Key words: stromatolite, thrombolite, intracratonic sag, microbial mat, microbialite, Dengying Formation, Upper Sinian, Sichuan Basin

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