塔里木盆地雅克拉断凸下侏罗统沉积特征  

Analysis on sedimentary characteristics of lower Jurassic in Yakela fault arch, Shaya uplift of Tarim basin

作　　者：金燕林[1] 秦飞[2] 姚田万[3] 

机构地区：[1]中国石化西北油田分公司勘探开发研究院,新疆乌鲁木齐830011 [2]中国石化西北油田分公司工程技术研究院,新疆乌鲁木齐830011 [3]中国石化西北油田分公司雅克拉采气厂,新疆巴音郭楞842017

出　　处：《油气地质与采收率》2013年第3期37-40,45,共5页Petroleum Geology and Recovery Efficiency

基　　金：中国石化先导项目"雅克拉侏罗系气藏开发前期评价与概念设计"(YC2009-109)

摘　　要：塔里木盆地雅克拉断凸下侏罗统形成于断凸沉降期,不同时期的区域构造活动对沉积的控制作用有所差异,从而表现出不同的沉积特征。根据测井解释结果结合岩性资料,将研究区下侏罗统划分为4个砂组,分别从碎屑组分、单井相、物源及平面沉积相、纵向地层对比等方面进行典型沉积特征及差异分析。下侏罗统自下而上发育辫状河三角洲前缘、辫状河三角洲平原和浅湖3种亚相,共有3类不同母岩性质的物源体系,且不同沉积时期物源供给方式和供给量差异显著:3和4砂组沉积时期为三角洲前缘河道砂沉积,且3类物源供给丰富,平面沉积相展布呈现以沙参2和沙4井区为代表的哑铃形,与有效储层厚度分布形态相符;2砂组沉积时期过渡为三角洲平原沼泽环境,物源供给来源减少,其规模明显减小;1砂组沉积时期经历了由沼泽相到浅湖相的过渡,物源供给几乎中断。研究区各微相沉积特征显著,广泛发育物性较好的水下分流河道微相,其发育区是有利储集区。The lower Jurassic layer of Yakela fault arch was formed during subsidence. The control on sediment of area tectonism was quite different in various periods and with various depositional features. The study on main Cretaceous reservoirs was very mature. The discovery of new area of oil and gas, and research on the earlier and thinner lower Jurassic layer became increasingly prominent. The four sand beds of target zone displayed typical depositional features. This paper succeeded to specifically elaborate these typical sedi mentary features and differences from fragments, single well facies, provenance systems, plane sedimentary facies and longitudinal stra ta correlation. The sedimentary subfacies of lower Jurassic layer experienced facies from delta front to delta plain of braided river to shallow lake from bottom to top. Three main provenance systems behaved significantly different on supplying patterns and quantities. The Ⅲ-Ⅳsand bed is deposited with channel sandbodies of delta-front and three provenance systems are abundantly supplied. The distribution form of sedimentary facies in plane is in shaped of dumbbell that is represented by SC2 and S4 well area, in accordance with the distribution of effective reservoir. The Ⅱsand bed is swamp deposited as delta-plain and provenances reducing increasingly. TheⅠsand bed transited to shallow lake facies and the provenances was nearly interrupted. The microfacies display obvious differenc es. The extensive developed and better submarine distributary channel microfacies can be regarded as favorable facies. This paper attri butes guides and references not only for subsequent oil/gas potential arguments, but also for researches on characteristics and develop ment of similar oil/gas reservoir.

关 键 词：下侏罗统 沉积相 沉积特征 有利区带 雅克拉断凸 

分 类 号：TE112.23[石油与天然气工程—油气勘探]