下二门油田核二段储层非均质性强,相邻井产能相差较悬殊。为确定各油组沉积微相分布和储层非均质性特征,文中基于岩心、测井和粒度等资料,对核二段进行沉积微相划分和微相特征分析,并对储层砂体的分布形态和展布以及砂体叠置关系进行探讨,认为核二段Ⅱ—Ⅴ油层组发育辫状河三角洲前缘亚相沉积,并可细分为水下分流河道、河口坝、远砂坝、前缘席状砂和分流间湾等 5 个沉积微相和浊积体相,其中水下分流河道、河口坝微相为研究区的有利相带。

The reservoir heterogeneity of the second member of Hetaoyuan Formation in Xia’ermen Oilfield is strong and the adjacent well productivity is greatly different. On the basis of the data of core, well logging and grain size, the division and characteristics analysis of sedimentary microfacies of the second member of Hetaoyuan Formation are carried out, and the shape and distribution of the reservoir sand body and the mode of sand body superposition are analyzed. The result showed that Ⅱ—Ⅴoil2bearing layer of the second member of Hetaoyuan Formation developed braided river delta front subfacies deposit , which can be divided into five sizes of sedimentary microfacies and creeping turbidite sand body. The sedimentary microfacies include subsea distributary channel, mouth bar, distal bar, front sheet sand and distributary interchannel, among which the subsea distributary channel and mouth bar are the favorable facies belt s of the study area.