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天然气地球科学

• 天然气地质学 • 上一篇    下一篇

岩溶背景下的优质天然气储层形成机理及主控因素——以鄂尔多斯盆地奥陶系马家沟组马五41储层为例

王琪1,2，许勇2,3，刘新社1，马东旭2,3，马晓峰2，李树同2   

  1. 1.低渗透油气田勘探开发国家工程实验室，陕西 西安 710018；
    2.甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室，甘肃 兰州 730000；
    3.中国科学院大学，北京 100049
  • 收稿日期:2016-02-26 修回日期:2016-09-10 出版日期:2016-12-10 发布日期:2016-12-10
  • 基金资助:
    低渗透油气田勘探开发国家工程实验室开放课题（编号:2016GSKJ05-01）资助.

Forming mechanism and main controlling factors on the high-quality gas reservoirs restricted by paleokarst background:A case from Ordovician M54 1 carbonate,Ordos Basin

Wang Qi1,2，Xu Yong2,3，Liu Xin-she1，Ma Dong-xu2,3，Ma Xiao-feng2，Li Shu-tong2   

  1. 1.National Engineering Laboratory of Exploration and Development on Low Permeability Oil & Gas Field,
    Xi’an 710018,China;2.Key Laboratory of Petroleum Resources Research,Gansu Province/ Key Laboratory
    of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,
    Lanzhou 730000,China;3.University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2016-02-26 Revised:2016-09-10 Online:2016-12-10 Published:2016-12-10

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摘要： 根据野外地质剖面、岩心和铸体薄片观察，结合阴极发光、X-射线衍射、扫描电镜等分析，认为鄂尔多斯盆地奥陶系岩溶古地貌自西向东依次发育岩溶高地、岩溶斜坡和岩溶盆地，为优质储层的形成奠定了基础。研究区内经历了同生期层间岩溶、表生期风化岩溶和埋藏期埋藏岩溶3类古岩溶，形成了大量原生孔隙和次生孔隙，为后期成岩作用的改造提供了条件。马五41储层主要发育泥粉晶白云岩、（含）硬石膏结核泥粉晶白云岩、含膏白云岩/膏质云岩、膏岩及岩溶角砾岩，主要发育溶蚀膏模孔、晶间孔、晶间溶孔与微裂缝4种储集空间，溶蚀膏模孔是最主要的储集空间。研究区优质储层发育主要受2个方面因素控制,其中:岩溶古地貌影响储层分布、物性差异、气水分布，是优质储层形成的基础；在岩溶改造后形成的孔隙系统基础上又经历了3期溶蚀作用，2种作用相互叠合是形成优质储层的关键。

关键词: 古岩溶, 天然气储层, 岩溶作用, 溶蚀作用, 膏模孔

Abstract: The karst palaeogeomorphology from west to east showing karst highland,karst slope and karst basin has laid the foundation for the formation of high-quality Ordovician reservoir in Ordos Basin.The study area experienced three types of karstification including contemporaneous interlayer karst,shallow burial weathering karst and burial karst to form lots of various pores and holes which provide the basis for later diagenetic alteration.M541 sublayer reservoirs mainly developed micrite dolostone,including anhydrite tuberculosis micrite dolostone,gypsum-containing dolostone,gypsum rock and karst breccias.Four kinds of reservoir spaces such as dissolution hole,primary intergranular pore,intergranular solution pores and microcracks are frequently observed with the dolostone reservoir.Gypsum dissolution mold pore is the main reservoir space.Based on field geological section,core description and thin sections,combined with cathodoluminescence,X-ray diffraction,and scanning electron microscopy analysis,it can be seen that the high-quality reservoir development in the study area is mainly controlled by two factors: karst palaeogeomorphology and late diagenetic dissolution.The former controlled reservoir distribution,physical property,gas and water distribution within the reservoir,so it is the basic condition to form the high-quality reservoir.And the latter reformed the pore system produced during karstification through three-periods of diagenetic dissolution.Therefore,the superimposition of these two geological processes is the key to the formation of high quality reservoirs in the study area.

Key words: Palaeokarst, Natural gas reservoirs, Karstification, Dissolution, Gypsum dissolution pore

中图分类号: 

  • TE122.2

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