准噶尔盆地七中东区白碱滩组精细地层对比研究

A Comparative Study on Fine Stratigraphy of Baijiantan Formation in Qizhong Middle Area of Junggar Basin

准噶尔盆地七中东区白碱滩组油藏主要含油层位是上三叠统白碱滩组。2015-2016年开展精细油藏描述研究,将白碱滩组自下而上分为T3b3、T3b2、T3b1层,主力储层位于上部的T3b2、T3b1层。前人分为3个砂层组,即:T3b23、T3b22、T3b21。由于河流沉积相变化快、工区东西跨度大、目的层厚度大,使用原地层划分对比方法对沉积相研究效果不好,所以需要在原地层分层的基础上进行精细分层,创建新的地层划分对比方案,为之后的沉积相研究奠定基础。

The main oil-bearing strata of the Baijiantan Formation in the middle and eastern part of the Junggar Basin are the Upper Triassic Baijiantan Formation.From 2015 to 2016,the study of fine reservoirs was carried out.Baijiantan Formation was divided into T3b3,T3b2 and T 3b 1 layers,and the main reservoir was located at the upper T3b2 and T 3b 1 layers.It is previously divided into three sand group,namely:T3b2 3,T3b2 2,T3b2 1.Due to the rapid change of river sedimentary facies and the large span of the east and the west,the thickness of the target layer is large,and the stratigraphic division method is not good for the sedimentary facies.Therefore,it is necessary to fine stratify the stratigraphic layer.It establishes a new stratigraphic division of the program in unified stratigraphic understanding after the study of the sedimentary facies to lay the foundation.