天然气地球科学

• 天然气地质学 • 上一篇    下一篇

鄂尔多斯盆地苏里格气田西南部成岩矿物转化与储层物性

樊爱萍1,2, 吴小宁3, 王龙3, 张春阳3, 郭俊锋4   

  1. 1.山东科技大学地球科学与工程学院,山东 青岛 266590;
    2.海洋国家实验室海洋矿产资源评价与探测技术功能实验室,山东 青岛 266071;
    3.中国石油长庆油田苏里格气田研究中心,陕西 西安 710018;
    4.中国石油集团测井有限公司长庆事业部,陕西 西安 710201
  • 收稿日期:2015-11-27 修回日期:2016-03-28 出版日期:2016-07-10 发布日期:2016-07-10
  • 作者简介:樊爱萍(1978-),女,陕西西安人,副教授,博士,主要从事石油天然气地质研究. E-mail:xiaofan781026@sina.com.
  • 基金资助:
    国家自然科学基金(编号:41402120);山东科技大学科研创新团队计划(编号:2010KYTD103)联合资助.

Diagenetic mineral transformations and reservoir properties in the southwestern Sulige Gasfield,Ordos Basin,China

Fan Ai-ping1,2, Wu Xiao-ning3, Wang Long3, Zhang Chun-yang3, Guo Jun-feng4   

  1. 1.College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao 266590;
    2.Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266071,China;
    3.Sulige Gas Field Research Center of Changqing Oilfield Company,PetroChina,Xi’an 710018;
    4.Changqing Department of CNPC Logging Co.,LTD,Xi’an 710201
  • Received:2015-11-27 Revised:2016-03-28 Online:2016-07-10 Published:2016-07-10

摘要: 成岩矿物的转化是致密砂岩储层物性变化的主要因素之一。为了探索二者之间的关系以及储层致密化成因,采用薄片观测、扫描电镜分析、阴极发光分析等手段,结合成岩演化过程中的矿物热力学特征和体积变化,探讨了苏里格气田西南部山1段、盒8段砂岩的矿物组成、孔隙特征、矿物转化机制及其对储层孔隙的影响。结果表明:①胶结物以黏土矿物、方解石为主,硅质少量;②绿泥石薄膜可包裹高岭石和石英加大边,偶见放射状绿泥石且孔隙较好;③黏土矿物晶间孔占孔隙比重较高,高岭石伊利石化后的晶间孔隙较发育,其次为溶蚀孔隙;④嵌晶状方解石充填剩余粒间孔隙,并交代石英加大边和伊利石,破坏储层物性。认为中成岩A期的钾长石溶蚀、蒙脱石伊利石化、高岭石伊利石化、黑云母水化都会使得矿物体积变小,属于增孔反应,在一定程度上改善储层孔隙;且胶结作用增加储层的抗压实能力,在一定程度上保护了原生孔隙;故在分析胶结作用对物性的影响时,不能简单地归结为破坏性成岩作用。

关键词: 苏里格气田, 成岩矿物转化, 孔隙演化, 储层物性, 体积变化

Abstract: Diagenetic mineral transformation is one of the main factors to properties changes of tight sandstone reservoir.In order to probe their relationships and reasons of sandstone reservoir densification from the Shan 1 and He 8 gas members in the southwestern Sulige Gasfield,thin section observation,SEM,cathodoluminescence microscope and other methods were adopted to discuss the mineral composition,pore characteristics,mineral transformation and its effect on reservoir porosity,combining with volume changes during mineral transformations in different diagenetic stages and mineral thermodynamic characteristics.Results show as follows:(1)Cements are mostly clay minerals and calcite with less siliceous;(2)Kaolinite and quartz overgrowth can be wrapped by chlorite film,and radial chlorite is little but with high porosity;(3)Clay mineral intergranular pores are most developed,especially in transformation from kaolinite to illite,and dissolution pores secondarily;(4)The poikilitic calcite filled in remaining pores,replaced quartz overgrowth and illite,and damaged porosity.The followed mineral transformations are reactions increasing porosities:K-feldspar dissolution,montmorillonite illitized,kaolinite illitized,biotite hydrated in mesogenetic A.Given cementation increase resistance of sandstone reservoirs,it protects original pores to some extent.As a result,cementation should not be simply regarded as a kind of destructive diagenesis when assess its influences on reservoir properties.

Key words: Sulige Gasfield, Diagenetic mineral transformations, Porosity evolution, Reservoir properties, Volume changes

中图分类号: 

  • TE122.2

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