【摘要】 惠民凹陷唐庄地区构造复杂,沙河街组是主要的勘探目的层。为了建立该区沙河街组准确的等时地层格架,统一地层划分对比标志,运用层序地层学的理论和方法,通过对岩心、测井、试油试采及地震资料的综合研究,将沙三段一沙一段划分为5个三级层序,分别对应于沙三段下亚段、沙三段中亚段、沙三段上亚段、沙二段及沙一段;由低水位体系域、扩张体系域、高水位体系域和收缩体系域4种类型的10个体系域构成,对应11个砂层组。以旋回划分为依据,以岩相旋回—厚度法为主,"等高程"法为辅的总体思路,在该区进行小层划分对比,共分出81个小层;结合油气分布规律、各小层砂层厚度和砂岩含量得出沙二段的Ⅱ砂层组、沙一段的Ⅰ和Ⅱ砂层组为主力产油层位。更多还原

【Abstract】 Tangzhuang area of Huimin Depression has complicated structure in which Shahejie Formation is its major prospected stratum.Theory and method of high -resolution sequence stratigraphy were utilized to construct the accurate synchronic stratigraphic framework of Shahejie Formation and to consolidate the stratigraphic division and correlation.Comprehensive analysis of lithology,logging,testing and production and seismic data shows that the Shahejie Formation ranging from the Sha1 member to the Sha3 member could be divided into 5 third-order sequences, corresponding to the lower,middle and upper of the Sha3 member,the Sha2 member and the Shal member of Shahejie Formation respectively.There are 10 system tracts with 4 different types:lowstand system tract,extension system tract,highstand system tract and contraction system tract.And these 10 system tracts are corresponded to 11 sand groups.Based on the cyclothem division,the author has adopted the general strategy,which gives priority to lithofacies cycle and the thickness law,with the law of range equal in height in assistance and thus 81 subzones are presented in this zone.In consideration of the oil and gas distribution pattern,the sand thickness of each subzone and the percentage of the sandstone,it can be concluded that the sand groupⅡof the Sha2 member,the sand groupsⅡandⅠof the Shal member are the main oil-yielding layers.更多还原