德惠断陷合隆-兰家地区泉头组沉积微相研究

Sedimentary Microfacies of Quantou Formation in Helong-Lanjia Area of Dehui Fault Depression

沉积微相发育情况是油气勘探潜力及后续开发的重要影响因素。德惠断陷泉头组是油气储集的重要层系,但并未对该层段进行系统的沉积微相研究,这对之后的勘探开发影响重大。综合前人研究成果及地质、地震、测井资料等,对研究区沉积环境及沉积微相平面展布特征进行了深入研究。将研究区泉头组地层划分为泉一段至泉四段,其中,泉一段下部发育辫状河相,泉一段上部及泉四段发育曲流河相,主要发育辫状河河道、曲流河河道、心滩、溢岸砂、河漫滩及泛滥平原微相,且砂体连通性强,具有良好的油气储集条件。

Sedimentary microfacies development is an important factor affecting oil and gas exploration potential and subsequent development.Quantou Formation in Dehui fault depression is an important layer of oil and gas reservoir,but it has not been systematically studied on the sedimentary microfacies,which has a great influence on the future exploration and development.Based on previous research results,geological,seismic and well logging data,the sedimentary environment and the planar distribution characteristics of sedimentary microfacies in the study area were thoroughly studied in this paper.The Quantou Formation in the study area can be divided into the first member to the fourth member,in which braided river facies are developed in the lower part of the first member,meander river facies are developed in the upper part of the first member and the fourth member,and braided river channel,meander river channel,core beach,overflow bank sand,floodplain and floodplain microfacies are mainly developed,and the sand body connectivity is strong,which has good reservoir conditions for oil and gas.