柴达木盆地西部跃进二号油田早渐新世沉积相研究  

Research on Early-Oligocene Sedimentary Facies of Yuejin Ⅱ Oilfield in Qaidam Basin

作　　者：于跃[1,2] 牟中海[2] 杨雪峰 漆麟 陈袁[5] 苏秋[5] 

机构地区：[1]成都理工大学,四川成都610059 [2]西南石油大学,四川成都610500 [3]中国石油青海油田分公司,甘肃敦煌736202 [4]川庆钻探工程公司地质勘探开发研究院,四川成都610056 [5]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000

出　　处：《西北地质》2015年第4期10-19,共10页Northwestern Geology

基　　金：中国石油天然气股份有限公司重大科技专项"柴达木盆地建设千万吨油气田综合配套技术研究"课题06"柴达木盆地老区稳产提高采收率技术研究"(2011E-0306)

摘　　要：目前在柴达木盆地西部跃进二号油田沉积相研究工作中,存在对微相类型争议性大、展布特征不精细等问题,这些问题制约着油田高含水期的精细开发。因此,根据沉积学基本原理,采用地质相识别(包括岩石学标志和沉积构造标志)与测井相分析(包括自然伽马和自然电位的曲线特征)的综合研究方法,细化该油田早渐新世辫状河三角洲平原、辫状河三角洲前缘、滨浅湖沉积亚相,得出水上分流河道、泛滥平原、水下分流河道、河口坝、远砂坝、席状砂、分流间湾、砂坝、砂滩、滨浅湖泥10种微相。该套地层纵向从下至上具有完整的辫状河三角洲平原-辫状河三角洲前缘-滨浅湖的退积式正旋回相序。结合沉积微相平面展布和纵向相序,跃进二号油田早渐新世这套油藏存在2种类型的沉积模式:辫状河三角洲模式和湖泊模式。The micro-facies are uncertain and their distribution characteristics are not fine,which exists in the sedimentary study of Yuejin Ⅱ oilfield that locatedatthe west part of Qaidam Basin.And such problems restrict the fine development at the high water-cut stage.So based on the basic principle of sedimentology,the delta plain,braid-river delta front,shore-shallow lake sedimentary background in early-Oligocene have been elaborated by synthesizing geological facies identification（e.g.petrology marks and sedimentary tectonics marks） and logging facies analysis（e.g.and SP curve character）.Such sedimentary sub-faciesare divided into ten micrcrfacies,such as water distributary channel and flood plain,underwater distributary channel,mouth bar,distal bar,sheet sand,distributary bay,sand bar,sand beach,shore-shallow lake of mud.From the bottom to top vertically,the strata have a complete retrograding sequences,including braided river delta plain,braided river delta,shore-shallow lake.Combination of vertical and plane distribution of sedimentary micrcrfacies,there are two types of the reservoir sedimentation models,namely,the model of the braided river delta and lake in the target zone.

关 键 词：沉积相 早渐新世 跃进二号油田 柴达木盆地 

分 类 号：TE121.3[石油与天然气工程—油气勘探]