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鄂尔多斯盆地延长组长81是镇原油田的一个重要勘探层位。利用镇原油田23口井的测井资料以及通过取芯井岩心观察及分析,笔者认为该区是三角洲沉积类型的三角洲前缘沉积,进一步分为河口坝,水下分流河道和水下分流间湾3种微相类型,并对各沉积微相的特征和剖面结构进行了分析。通过充分利用测井相组合形态特征,绘制了各沉积微相在剖面上的分布和在平面上的展布图,进而得出水下分流河道为研究区最为发育的沉积微相,也是最有利的储集砂体。
Yanchang Formation 81 in Ordos Basin is an important exploration layer in Zhenyuan Oilfield. Using the well logging data of 23 wells in Zhenyuan Oilfield and the observation and analysis of coring cores, the authors believe that the delta sedimentary delta front deposit is further divided into estuarine dam, underwater distributary channel and underwater diversion Bay three kinds of microfacies types, and the sedimentary microfacies characteristics and profile structure were analyzed. By making full use of the characteristics of well log assemblages, the distribution of each sedimentary microfacies in the cross section and its distribution in the plane are plotted. It is concluded that the underwater distributary channel is the most developed sedimentary microfacies in the study area and is also the most favorable Reservoir sand body.