柴达木盆地红柳泉油田储层沉积相研究——针对下干柴沟组下段油藏上砂组层段

Study on Sedimentary Facies of Upper Sand Formation of E31 Reservoir in Hongliuquan Oilfield, Caidamu Basin

为了对红柳泉油田下干柴沟组下段油藏上砂组的沉积相有一个明确的认识 ,以岩心相分析为基础 ,综合储层岩性、沉积构造及粒度等方面的特征 ,对沉积相平面展布规律进行了分析 .确定了目的层段为曲流河三角洲沉积体系 ,并且主要为水上三角洲亚相 ;其具体微相包括分流河道、决口水道、天然堤及泛滥平原 4类 ,建立了三角洲亚相垂向相层序及三维空间相模式 .最终探讨了沉积相对储层的物性及含油性的影响及控制作用 。

According to the facies analysis of core, the lithological characters of the reservoir, sedimentary structures and the analysis data of grain size, the plane distribution law of sedimentary facies are analyzed. And it is held that the target formation consists of meandering river delta plain sediments, primarily above water delta subfacies, and the main microfacies include meandering river distributary channel, crevasse channel, natural barrier and flood plain. The vertical facies sequence and 3D facies model of the delta subfacies are established. Finally, the control of different sedimentary facies on the physical properties and oil bearing characteristics of the reservoir is studied. The results of the study provide important geological basis for the comprehensive research and the prediction of favorable facies belts of the reservoir.