鄂尔多斯盆地桥镇地区延长组长1段沉积相分析及其油气地质意义  

Sedimentary facies analysis of Chang 1 member of Yanchang formation in Qiaozhen area,Ordos Basin and its petroleum geological signifi cance

作　　者：石雪峰 杜海峰 仲米剑 SHI Xuefeng;DU Haifeng;ZHONG Mijian(􀀏EnerTech-Drilling&Production Co􀀏,CNOOC,Tanggu 300452,Tianjin,China;􀀏Shaanxi Yanchang Petroleum(Group)Co􀀏,LTD􀀏,Yanan 710075,Shaanxi,China)

机构地区：[1]中海油能源发展工程技术公司钻采工程研究院,天津塘沽300452 [2]陕西延长石油(集团)有限责任公司,陕西延安710075

出　　处：《自然资源情报》2022年第5期43-47,32,共6页Natural Resources Information

摘　　要：鄂尔多斯盆地上三叠统延长组长1段是一套湖沼相含煤泥质沉积,也是重要的区域盖层。在盆地不同区域,针对长1段的沉积相和油气地质意义方面的认识较为模糊。本文基于高分辨率层序地层学理论,通过分析盆地内桥镇地区长1段的露头、钻井和测井资料,认为在长1段发育辫状河三角洲前缘和浅湖沉积,其骨架砂体为水下分流河道砂体。长1段在含油气系统中兼具生、储、盖层的特点,不仅是区域盖层,还可以作为油气储层,其中富有机质的暗色泥岩还可以是长2段油藏的烃源岩。Chang 1 member of the Yanchang Formation of Upper Triassic in Ordos Basin is a set of lacustrine swamp sedimentary mudstone and coal-bearing deposits.It is also important regional capping beds.In diff erent parts of the basin,the geological signifi cance of sedimentary facies and oil and gas of Chang 1 period is not clearly recognized.Based on the high-resolution sequence stratigraphy theory,this paper analyzes the outcrop and drilling data in Qiaozhen area of Chang 1 member.It proves that there are braided river delta front and shallow lake deposits in Chang 1 formation,and the underwater distributary channel sand is main reservoir.Chang 1 member possesses the characteristics of source,reservoir and cap rock in the petroleum system.It is not only a regional cap rock,but also an oil and gas reservoir.The organic rich dark mudstone of Chang 1 member can also be the source rock of the reservoir of Chang 2 member.

关 键 词：长1段 沉积相 储层 烃源岩 桥镇 高分辨率层序地层学 

分 类 号：F618.13[经济管理—产业经济]