莫北区块三工河组浅水三角洲储层特征及勘探前景  

Shallow-Water Delta Reservoir Characterization and Exploration Prospect in the Sangonghe Formation of Mobei Block

作　　者：孙靖 薛晶晶[1] 厚刚福 宋明星[1] 贾开富[1] Sun Jing;Xue Jingjing;Hou Gangfu;Song Mingxing;Jia Kaifu(PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang 834000,China;PetroChina Hangzhou Institute of Geology,Hangzhou,Zhejiang 310023,China)

机构地区：[1]中国石油新疆油田分公司,新疆克拉玛依834000 [2]中国石油杭州地质研究院,浙江杭州310023

出　　处：《特种油气藏》2020年第3期34-39,共6页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项“准噶尔盆地岩性地层油气藏富集规律与目标评价”(2017ZX05001-004);中国石油新疆重大科技专项“准噶尔盆地油藏富集规律及勘探技术研究与应用”(2017E-0401)。

摘　　要：为明确和拓展准噶尔盆地岩性油气藏和复合油气藏勘探新领域,以盆地莫北区块侏罗系三工河组二段为例,综合利用钻井、测井、分析化验以及地震等数据和资料,对三工河组浅水三角洲的储层特征和勘探前景进行了研究。结果表明:储层砂岩以粗粒、中粗粒长石岩屑砂岩为主,具有中-低孔隙度和渗透率,以剩余原生粒间孔为主,孔喉微观结构和渗流能力中等-较好。沉积体系类型为浅水辫状河三角洲-湖泊体系,依据两级坡折带识别出内前缘、外前缘、砂质碎屑流等主要亚相;前缘水下分流河道砂体为骨架砂体,分为粗粒厚层块状和中细粒中薄层似块状2种类型,垂向多套,侧向切割、叠置,平面上宽条带状分布,朵叶体呈朵状或鸟足状,构成了前缘复合体。河道砂体储集条件和储层质量好,且多期砂体叠置连片分布,分布范围广、面积大;同时,具有良好遮挡和封堵、烃源以及输导条件,易形成规模岩性或复合油气藏,勘探前景良好。研究成果对深化和落实盆地勘探新领域具有指导作用。The Member-2 in the Jurassic Sangonghe Formation of Mobei block was taken to identify and expand new areas for exploration of lithology and composite reservoirs.The shallow-water delta reservoir characterization and exploration prospect in the Sangonghe Formation was studied by comprehensively using drilling,logging,test,seismic and other data.Result indicates that the reservoir sandstone is dominated by coarse and medium-coarse feldspar debris sandstone,which is characterized by medium-low porosity and permeability.The reservoir space is mainly dominated by remaining primary intergranular pore,which shows medium-high pore-throat microstructure and seepage capacity.It is considered as a shallow-water braided river delta-lake system.The inner front,outer front and sandy debris flow and other major subfacies were identified based on the two-level slope break zone.The front underwater distributary channel sandbody is determined as the framework sandbody,which can be classified into 2 categories,including coarse thick massive and medium-fine thin massive types.The front underwater distributary channel sandbody is featured by multiple distribution,lateral cutting,superposition and wide strip distribution on the plane.The leaf body is flower-like or bird-foot shape,which form the front complex.The channel sandbody with high preservation and reservoir properties indicates continuous superposed distribution with multiple-stage sandbodies,wide range and large area.In addition,the channel sandbody is characterized by favorable shielding,sealing,hydrocarbon source and transportation performances,which illustrates a favorable exploration prospect in lithology or composite reservoirs.This research could provide certain guidance for the deepening and implementing new exploration areas in this basin.

关 键 词：储层特征 浅水三角洲 勘探前景 三工河组 莫北区块 准噶尔盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]