卫城油田卫81断块沙四段高分辨率层序地层学研究

通过钻井、测井，古生物等资料的分析，应用陆相层序地层学理论对卫城油田卫81断块沙四段进行高分辨率层序地层学研究，依据岩性，构造，古生物，测井等标志将沙田段划分出1个三段层序，2个体系域，4个淮层序组和18个准层序，其中，沙四下段为低水位体系域，主要发育洪水一漫湖沉积体系；沙四上段为湖侵体系域，主要发育湖粕三角洲沉积体系，烃源岩为沙四上段的暗色泥岩，储集层为沙四上段的湖粕三角洲砂体和沙四段的洪水流砂体。

Study of the high resolution sequence stratigraphy of Sha-4 member in Wei-81 fault block,Weicheng oil field

Based on the systematical analysis of drilling,logging data and palaeontology,using continental facies sequence stratigraphy,the high resolution stratigraphic sequence of Sha 4 member in Wai 81 fault block,Weicheng oil field, was studied On the basis of the lithological characteristics,tectonic evolution,palaeontology and logging,the Sha 4 member was divided into:1 three order sequence,2 system tracts,4 parasequence sets,18 parasequence The lower Sha 4 member consists of lowstand system tract which mainly developed flood flow deposition tract,and upper Sha 4 member consists of trangressive system tract which mainly developed delta deposition tract The source rocks are the dark grey mudstone of the upper Sha 4 member, and the reservoir is lake delta facies from upper Sha 4 and flood flow deposition tract from lower Sha 4 member