吴起地区长2油层组侵蚀残余地层油藏控制因素  

Controlling factors of erosion paleogeomorphology oil pool of Chang 2 oil reservoir group in Wuqi area,Ordos Basin,China

作　　者：杜凌春 李凤杰[1] 屈雪林 张雁[2] 侯景涛[2] 苏幽雅[2] 

机构地区：[1]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059 [2]中国石油长庆油田分公司第三采油厂,银川750006

出　　处：《成都理工大学学报（自然科学版）》2015年第6期719-725,共7页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家"十二五"重大科技专项(2011ZX05002-001-001)

摘　　要：通过铸体薄片、扫描电镜和压汞分析,以及依据油藏所处的构造形态、储层成因类型、油藏成藏要素等对油藏进行解剖分析,探讨鄂尔多斯盆地吴起地区长2油层组侵蚀残余地层油藏的控制因素。吴起地区长2油层组储层砂体孔隙类型主要为剩余原生粒间孔和次生溶孔,孔隙结构分选中等;发育上倾尖灭型、透镜体型、小幅背斜构造型和复合成因型4种油藏类型。鄂尔多斯盆地延长组侵蚀残余地层油藏成藏受古地貌、岩性和构造等多重因素的控制,油藏主要分布于古河道两侧的斜坡带上。地层完整的长2油层组内,小幅背斜构造与分流河道砂体叠置,形成规模较大的构造-岩性复合成因油藏,是吴起地区长2油层组主要的油藏类型。This paper analyses the casting thin sections, scanning electron microscope and mercury injection. The result shows that the rock types of the Chang 2 （Member 2 of Triassic Yanchang Formation） oil reservoir group in the Wuqi area of Ordos Basin are mainly the fine-grain feldspathic lithic sandstone and lithic arkose, the types of reservoir space are mainly the residual original intergranular pores and the secondary solution pores, and the sorting reservoir pore structure is medium. Based on the detailed analysis of the reservoir structure in paleogeomorphology, the genetic types of the reservoir, and the reservoir accumulation elements, etc. , 4 types of oil reservoirs, that is, the updip pinch-out type, the lens shape, the small anticline structure type and the compound genesis type, develop in the Chang 2 oil layer group of the Wuqi area. It can be concluded that the Yanchang Formation erosion residual geomorphology reservoir in Ordos Basin is controlled by multiple factors, such as, geomorphology, lithology and structure. The reservoir is mainly distributed over the

关 键 词：残余地层 油藏控制因素 长2油层组 吴起地区 鄂尔多斯盆地 

分 类 号：TE122.3[石油与天然气工程—油气勘探]