二连盆地吉尔嘎朗图腾格尔二段沉积相研究

Study on sedimentary facies of second member of Tengger Formation in Jiergalangtu,Erlian Basin

在区域沉积演化背景分析的基础上,以沉积地质学、测井地质学等理论为指导,利用取心井观察与描述、录井、测井、薄片及测试分析等资料,对二连盆地吉尔嘎朗图腾格尔组二段的沉积相进行了划分,结合区域沉积、构造演化背景,划分沉积相类型并对沉积相进行单井到连井到砂体平面展布的逐步研究,分析了其平面展布及垂向演化特征。结果表明:沉积相分为辫状河三角洲相和湖泊相,亚相分为辫状河三角洲前缘亚相和深—半深湖亚相,并进一步划分为水下分流河道间、席状砂、水下分流河道、河口砂坝、湖泥5个微相;研究区砂体厚度总体较大,平面呈东南向西北展布。研究为研究区的油气勘探提供依据。

Based on the analysis of regional sedimentary evolution background,guided by the theories of sedimentary geology and well logging geology,etc.This paper divides the sedimentary facies of the second member of Tengger Formation in Jiergalangtu,Erlian Basin by using the data of observation and description of coring wells,logging,thin section and test analysis and combines the regional sedimentary and structural evolution background to divide the types of sedimentary facies and sedimentary facies.The results show that the sedimentary facies can be divided into braided river delta facies and lake facies,the subfacies can be divided into braided river delta front subfacies and deep semi deep lake subfacies,and further divided into five microfacies:underwater distributary channel,sheet sand,underwater distributary channel,estuarine sand bar and lake mud;the sand body in the study area is generally thick and the plane is distributed from southeast to northwest.The purpose of this study is to provide basis for oil and gas exploration in the study area.