天然气地球科学

• 天然气地质学 • 上一篇    下一篇

鄂尔多斯盆地长7段致密储层主要黏土矿物特征及其地质意义

尤源1,2,梁晓伟1,2,冯胜斌1,2,牛小兵1,2,淡卫东1,2,李卫成1,2,王芳1,2   

  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.中国石油长庆油田分公司勘探开发研究院,陕西 西安 710018
  • 收稿日期:2019-03-06 修回日期:2019-05-30 出版日期:2019-08-10
  • 作者简介:尤源(1982-),男,宁夏盐池人,高级工程师,博士,主要从事低渗透—致密油藏评价及开发研究. E-mail:Source2004@126.com.
  • 基金资助:
    国家科技重大专项“重点盆地致密油资源潜力、甜点区预测与关键技术应用”(编号:2016ZX05046-006);国家科技重大专项“鄂尔多斯盆地致密油资源潜力、甜点预测与关键技术应用”(编号:2016ZX05046-005);中国石油天然气股份有限公司重大科技专项“鄂尔多斯盆地石油富集规律及勘探目标评价”(编号:2016E-0501)联合资助.

Features and geological significance of main clay minerals in Chang 7 tight sandstone reservoir,Ordos Basin

You Yuan1,2,Liang Xiao-wei1,2,Feng Sheng-bin1,2,Niu Xiao-bing1,2,Dan Wei-dong1,2,Li Wei-cheng1,2,Wang Fang1,2   

  1. 1.National Engineering Laboratory of Exploration and Development of Low-Permeability Oil-Gas Fields,Xi’an 710018,China;
    2.Research Institute of Exploration and Development of Changqing Oilfield Company,PetroChina,Xi’an 710018,China
  • Received:2019-03-06 Revised:2019-05-30 Online:2019-08-10

摘要: 鄂尔多斯盆地延长组长7段致密储层表现为强压实、强胶结的致密化特征,其中伊利石、绿泥石等黏土矿物的大量存在是导致储层致密的重要原因。通过铸体薄片、扫描电镜、XRD等测试资料结合沉积、成岩环境分析,研究了长7段致密砂岩储层主要黏土矿物的微观赋存状态,并刻画了宏观分布特征,在此基础上探讨了其形成机理及对储层的影响。结果表明,长7段致密储层黏土矿物中伊利石含量最高,占黏土矿物总量的近60%,其次为绿泥石,占总量的30%以上,高岭石含量较低;受物源区母岩特征、砂岩成因类型、沉积环境、成岩流体性质等因素影响,各种黏土矿物平面分布具有差异性,陇东地区伊利石含量特别高,陕北地区绿泥石和高岭石含量相对较高;黏土矿物对陕北地区长7段致密砂岩最显著的影响表现为绿泥石膜对原生孔隙的保护及高岭石对孔隙的充填;而对陇东地区长7段致密砂岩最显著的影响则表现为伊利石对原生孔隙的普遍充填分割。沉积环境和原生孔隙条件的差异及自生黏土矿物形成过程中物质、流体复杂作用造成现今不同地区长7段致密储层孔隙发育特征的差异,并对开发特征产生影响。

关键词: 黏土矿物, 鄂尔多斯盆地, 致密砂岩, 伊利石, 绿泥石

Abstract: Characterized by strong compaction,strong cementation,Chang 7 sandstone member is a typical tight reservoir.The abundant existence of authigenic clay minerals,such as illite,chlorite,etc.,is the main reason leading to reservoir tightness.In this study,the occurrence state and distribution characteristics of main clay minerals were quantitatively investigated,through analysis of casting thin sections,SEM and XRD,and sedimentation background and diagenetic environment.On the basis of that,the formation mechanism of main clay minerals and their influence on reservoir property were discussed.The results show that among the main clay minerals in Chang 7 reservoir,illite,chlorite and kaolinite account for 60%,30% and a small content respectively.Affected by parent rock features of provenances,sandstone genetic types,sedimentary environment and diagenetic fluid property etc.,clay minerals vary in content on the plane.The content of illite is quite high in Longdong area,while the content of chlorite and kaolinite are higher in Shanbei area.The most significant impacts of clay minerals on Chang 7 tight sandstone reservoir in Shanbei area are the protection of primary pore by chlorite film and the filling of pores by kaolinite,while that on Chang 7 tight sandstone reservoir in Longdong area is the filling and dividing of illite to primary pores.Differences in sedimentary environment and primary pore conditions and complex reactions between materials and fluids during the formation of authigenic clay minerals led to the differences in pore development features in Chang 7 tight reservoir of different areas,which then affect the development performance.

Key words: Clay minerals, Ordos Basin, Tight sandstone, Illite, Chlorite

中图分类号: 

  • TE122.3
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