库车凹陷xh3井区克拉玛依组沉积微相分析

Sedimentary Microfacies Analysis of Karamay Formation in Wellblock xh3 of Kuqa Sag

摘要: 塔里木盆地库车凹陷xh3井区三叠系克拉玛依组存在沉积相划分不清的问题。以沉积学理论和地震沉积学为指导，利用地震属性和地震反演分析方法，对库车凹陷克拉玛依组沉积相进行预测。研究认为，克拉玛依组为扇三角洲–湖泊沉积体系，发育扇三角洲平原、扇三角洲前缘、滨浅湖3个亚相以及分流河道、分流河道间、水下分流河道、河口坝4种主要微相。同时划分出研究区的有利含油气相带，以期为今后寻找油气藏提供地质依据。

Abstract: There existed the problem of unclarified sedimentary facies of Triassic Karamay Formation in Wellblock xh3 of Kuqa Sag in Tarim Basin. Guided by the theory of sedimentology and seismic se-dimentology, the methods of seismic attribute and seismic inversion analysis were used to forecast the sedimentary facies of Karamay Formation in Kuqa Sag. Study indicates that Karamay Formation is a fan delta-lake sedimentary system, where 3 subfacies such as a fan delta plain, fan delta front, shore and shallow lake and 4 microfacies such as a distributary channel, interdistributary channel, underwater distributary channel and mouth bar are developed. At the same time, the oil and gas bearing areas are divided in the study area; it provides a geologic basis for looking for oil and gas reservoirs in the future.