准噶尔盆地腹部侏罗系三工河组沉积相分析

目的层段沉积相研究是勘探目标优选的基础。以岩心分析和大量的钻井、测井、地震资料为基础,研究了准噶尔盆地腹部侏罗系三工河组沉积相、微相构成及主要含油储层的沉积微相特征,认为三工河组发育辫状河三角洲、扇三角洲、曲流河三角洲等沉积相类型,储层主要为各类三角洲前缘的水下分支河道和河口坝。在高分辨率层序地层划分与对比的基础上,结合研究区内的试油资料,分析了主要目的层沉积微相的演化和平面分布,指出三工河组沉积中、晚期形成的三角洲前缘河口坝砂体和水下分支河道砂体是最重要的勘探目标。

Analysis on sedimentary facies of Sangonghe Formation of Jurassic in the belly of Junggar Basin

Studying sedimentary facies of target strata is the base of optimum selection of exploration targets. Based on core observation and a large number of drilling, logging and seismic data, the composition of sedimentary facies and microfacies and sedimentary microfacies characters of main reservoir of Sangonghe Formation of Jurassic in the belly of Junggar Basin are investigated. The types of sedimentary facies of braided river delta, fan delta and meandering river delta in Sangonghe formation are identified. Reservoir beds are mainly submerged branched channel and mouth bar of various kinds of delta front. The evolution and plane distribution of the sedimentary microfacies in main target bed are analyzed through high-resolution sequence stratigraphic division and correlation combining well testing data of the study area. It is pointed out that the mouth bar and submerged branched channels sandbodies in the delta front formed at the middle to late Sangonghe formation are the most important exploration targets.