鄂尔多斯盆地盐定地区三叠系延长组长2油层组沉积相研究  

Sedimentary facies of Chang 2 oil-bearing member of Yanchang Formation in Yanchi-Dingbian area,Ordos Basin

作　　者：陈斐[1] 魏登峰[2] 余小雷[1] 吴少波[1] 

机构地区：[1]西安石油大学油气资源学院 [2]延长油田股份有限公司七里村采油厂

出　　处：《岩性油气藏》2010年第1期43-47,共5页Lithologic Reservoirs

摘　　要：根据大量的钻井、测井及分析化验资料,运用沉积学方法综合研究该区的沉积相及其演化特征,并认为:长2油层组早、中期(长23、长22)主要发育曲流河沉积,表现为垂向上河道砂体相互叠加,砂地比值高,平面上河道沉积广泛分布,泛滥平原沉积保存较少;晚期(长21)过渡为网状河沉积,河道砂体厚度变薄,地层砂地比变小,平面上河道呈网状分布,广泛发育河漫沼泽沉积。在沉积单元划分、对比的基础上,分析了4个单元沉积微相的平面展布规律。Based on drilling cores and logging data, the sedimentary facies and its evolution characteristics of Chang 2 oil-bearing member in Yanchi-Dingbian area, Ordos Basin are studied. The result shows that fluvial system developed in Chang 2 depositional stage in this region. During the depositional period, there is a systematic change in channel types from meandering stream to anastomosing river. The meandering stream deposition developed at the bottom and middle sections （Chang 23, Chang 22） of Chang 2 member with thicker superposed channel sand body, higher sand-stone/ stratum ration, less floodplain and more channel deposits. While the anastomosing river deposition developed at the top section （Chang 21） of Chang 2 member with thinner channel sandstone-body, lower sandstone/stratum ration, less channel and more floodplain, swamp deposits. On the basis of sedimentary units division and correlation, the mierofacies plane distributions of the 4 units are analyzed.

关 键 词：三叠系 延长组 沉积微相 盐定地区 

分 类 号：TE121.3[石油与天然气工程—油气勘探]