粗粒浅水三角洲沉积特征及模式——以准噶尔盆地莫北地区侏罗系三工河组为例  

Sedimentary characteristics and model of coarse-grained shallow-water delta:a case study of Jurassic Sangonghe Formation in Mobei Area,Junggar Basin

作　　者：孙靖 薛晶晶[1] 费李莹 宋明星[1] 贾开富[1] SUN Jing;XUE Jingjing;FEI Liying;SONG Mingxing;JIA Kaifu(Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay,Xinjiang 834000,China)

机构地区：[1]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000

出　　处：《东北石油大学学报》2022年第2期13-22,I0001,I0002,共12页Journal of Northeast Petroleum University

基　　金：国家科技重大专项(2017ZX05001-004);中国石油天然气股份有限公司重大科技专项(2017E-0401)。

摘　　要：以准噶尔盆地莫北地区侏罗系三工河组为例,基于岩心、录井、薄片、测井和地震等资料,分析侏罗系三工河组粗粒浅水三角洲的沉积特征及模式。结果表明:莫北地区广泛发育以粗砂岩、中粗砂岩为主的粗粒浅水三角洲沉积,盆1井西凹陷发育控制沉积的两级坡折带和三个区带,凸起—斜坡区发育粗粒浅水辫状河三角洲—湖泊体系,形成浅水辫状河三角洲内前缘、外前缘及砂质碎屑流亚相,整体呈朵状或鸟足状垂直或斜交湖岸分布。水下分流河道砂体作为前缘骨架砂体,以粗粒、中粗粒长石岩屑砂岩为主,块状和牵引流成因构造发育,物性相对较好。垂向发育多期砂体,侧向砂体相互切割、叠置,连片分布;平面呈近东西方向、宽条带状,发育4支浅水辫状河三角洲前缘水下分流河道砂体,分布范围广,延伸距离远;类型为温带湿润气候条件下的水进退积、粗粒型浅水辫状河三角洲,湖盆面积大,物源供给充足。该结果为准噶尔盆地莫北地区及同类区域勘探开发提供参考。Take the Jurassic Sangonghe Formation in Mobei Area,Junggar Basin as the example,the sedimentary characteristics and models of the Jurassic Sangonghe Formation were analyzed based on core data,logging,thin sections,well logs and 3D seismic data.The results show that the coarse-grained shallow water delta deposits,which are mainly coarse and medium-coarse sandstone,are widely developed in the Mobei Area.Two grade slope breaks and three zones controlling sedimentation are developed in the western depression of well Pen 1.Coarse-grained shallow braided river delta-lake system develops in the uplift-slope area,forming two sub-facies of the inner and outer front,which distribute vertically or obliquely along the lakeshore as a whole in the shape of flowers or birds feet.The underwater distributary channel sandbody which are mainly coarse and medium-coarse grained feldspar lithic sandstone is the frontal skeleton.Block and traction flow origin structures are well developed,and their physical properties are relatively good.Multi-stage sand bodies are well developed in the vertical and cut and overlap each other in the lateral,and continuous distribution.Four front underwater distributary channels which are widely distributed and extends far away are developed in the plane near east-west direction.The type is the transgressive-regressive,coarse-grained shallow water delta which has a large area and abundant source supply in wet climate.The results may serve as a reference for deepening exploration and development in the Mobei Area and similar fields in the Junggar Basin.

关 键 词：粗粒沉积 浅水三角洲 沉积模式 三工河组 侏罗系 莫北地区 准噶尔盆地 

分 类 号：P618.13[天文地球—矿床学] TE122[天文地球—地质学]