鄂尔多斯盆地陕北地区长7砂岩储层成岩相特征研究  

Diagenetic facies of the Chang 7 sandstone reservoir in the northern Shaanxi Province, Ordos Basin

作　　者：李渭[1,2] 白薷 马瑶[1] 李兆雨 

机构地区：[1]大陆动力学国家重点实验室西北大学地质学系,西安710069 [2]中国地质调查局西安地质调查中心,西安710054 [3]延长石油研究院,西安710075

出　　处：《地质科学》2015年第3期955-969,共15页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家重点基础研究发展计划“973”项目（编号：2003CB214602）资助.

摘　　要：在大量样品测试数据与野外地质调查综合分析的基础上，对长7储层岩石学特征、物性、孔隙结构、成岩作用、成岩阶段和成岩相等进行了研究。结果表明：研究区长7储层处于中成岩A—B期。压实作用及碳酸盐、粘土（高岭石、伊利石、伊蒙混层）矿物胶结和硅质胶结作用是造成储层原生孔隙丧失的主要原因；绿泥石胶结抑制孔隙充填，长石溶蚀作用使孔隙间的连通性得到改善，储层物性得到提高。根据成岩作用类型、强度及其对储层物性的影响划分出6种成岩相，其中压实相、碳酸盐胶结相、粘土矿物胶结相、石英加大相、浊沸石充填相不利于储层的发育，而长石溶蚀相、绿泥石膜胶结相对储层物性改善起了重要作用。Based on the comprehensive large numbers of sample test data and field geological investigation, the Chang 7 reservoir have been worked on lithological characteristics, reservoir property and pore structure, diagenesis, diagenetic stage, diagenetic face in Shanbei. The results show that Chang 7 reservoir of the study area is in the stage A to B stage of middle diagenesis phase. Compaction and cementation by carbonate, clay （kaolinite, illite, illite! smectite）mineral and silicon are the main causes of the loss of reservoir primary porosity. Chlorite cementation can prevent the pore from being filled. Dissolution of feldspar improve connectivity between pores. Physical properties of reservoir are improved by these. Six types of diagenetic facies are divided based on diagenesis and their effect on the reservoir quality, Compaction facies, carbonate cementation facies, clay mineral cementation facies and quartz overgrowth facies are unfavorable to the development of high quality reservoir. On the contrary, feldspar dissolution facies and chlorite cementation facies play an important role in improving the physical properties of reservoir.

关 键 词：陕北地区 长7储层 成岩作用 成岩相带 

分 类 号：TE122.2[石油与天然气工程—油气勘探]