鄂尔多斯盆地甘谷驿油田长4＋5储层砂岩成岩作用  

Sandstone diagenesis of Chang 4+5 reservoir in Ganguyi Oilfield of Ordos Basin

作　　者：严云奎[1,2] 于波 崔智林[1] 杨虎 刘宝平[2] 王泉波[1] 

机构地区：[1]西北大学地质学系大陆动力国家重点实验室,西安710069 [2]陕西延长石油(集团)有限责任公司油气勘探公司天然气开发部,陕西延安716000 [3]陕西延长石油(集团)有限责任公司研究院,西安710069

出　　处：《兰州大学学报（自然科学版）》2009年第3期8-12,共5页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金项目(90210022)

摘　　要：根据砂岩薄片、铸体薄片、扫描电镜、X-衍射等,研究了甘谷驿油田长4+5油层砂体的岩石学特征、成岩作用。研究表明:该区长4+5储层储集砂体成分主要以长石砂岩为主;储层砂岩的成岩作用处于晚成岩A期,早期的压实作用、多种矿物胶结作用是使物性变差的两个重要成岩作用;而溶蚀作用,特别是长石的溶蚀是使储层物性变好的重要成岩控制因素。Based on the analysis of casting lamella, scan electron microscope and X-ray diffractions, a study was carried out on the characteristics of petrology and diagenesis of Chang 4＋5 reservoir in Ganguyi Oilfield, Ordos Basin. The result shows that the main sandstone in the area is arkose with low compositional maturity. The diagenetic characteristics of Chang 4＋5 sandstone show that this set of sandstones are in the early A period of the late diagenetic stage at present. The early diagenetic compaction and multi-mineral cementation are major effective factors that lead to the poor astrophysical property of Chang 4＋5 reservoir, while dissolution, in particular dissolution of feldspar, is one of significant factors controlling the quality of the reservoir.

关 键 词：长4+5储层砂岩 成岩作用 鄂尔多斯盆地 

分 类 号：P918.13[天文地球—自然地理学]