塔河油田石炭系卡拉沙依组层序地层及沉积相研究

石炭系卡拉沙依组作为塔河油田碎屑岩领域主要产层之一,其沉积相类型及分布一直存在争议。本文通过井震结合,建立了该区的高精度层序地层格架。通过岩心观察,利用地震、测井、分析化验等资料,确定了沉积体系的类型,并开展了沉积相类型和展布的研究。研究表明,卡拉沙依组可划分为两个三级层序,其中层序CKLSQ1可划分为3个体系域,分别为低位体系域、海侵体系域和高位体系域;层序CKLSQ2可划分为两个体系域,分别为海侵体系域和高位体系域。沉积相为三角洲和潮坪相交互沉积,其中北部以三角洲相为主,南部盐上区以潮坪相为主,中部的盐边区为两者的过渡带。该认识为目的层段窄薄砂体的预测和精确刻画提供了地质依据。

Sequence stratigraphy and sedimentary facies in the Carboniferous Kalashayi Formation in the Tahe Oil Field, Tarim Basin, Xinjiang

The present paper deals,in the light of core examination,seismic data and well logs,with the types and distribution of the sedimentary facies in the Carboniferous Kalashayi Formation in the Tahe Oil Field,Tarim Basin,Xinjiang.The Kalashayi Formation may be divided into two third-order sequences.The sequence CKLSQ1 consist of three systems tracts： lowstand,transgressive and highstand systems tracts.The sequence CKLSQ2 consist of two systems tracts： transgressive and highstand systems tracts.The sedimentary facies are composed of the alternating terrigenous delta and tidal flat facies,and display the follwing arrangement： the delta facies in the northern part,the tidal flat facies in the southern part,and the transitional facies in the central part.The framework of sedimentary facies may provide geological evidences for further reservoir prediction and delineation in the study area.