准噶尔中部4区块侏罗系油气输导体系与油气成藏关系  

Relationship between hydrocarbon migration system and reservoir formation in the 4th Block of central Junggar Basin

作　　者：沈澈 蒋有录[1] 杨佳颖 方旭庆[2] 鲁修麟 SHEN Che;JIANG Youlu;YANG Jiaying;FANG Xuqing;LU Xiulin(School of Geosciences in China University of Petroleum(East China),Qingdao 266580,China;Management Center of Oil and Gas Exploration,Shengli Oilfield Company,SINOPEC,Dongying 257000,China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]中国石化胜利油田油气勘探管理中心,山东东营257000

出　　处：《中国石油大学学报（自然科学版）》2023年第6期13-25,共13页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：中石化新疆新春石油开发有限责任公司科研项目(30203569-21-2C0613-0055)。

摘　　要：准中4区块侏罗系油气藏具有混源、多期充注的特征,而断层和砂体复合形成的断层-砂体输导体系对油气的运移与聚集起到重要的控制作用。利用地质、测井、地震等资料刻画输导体系类型及分布特征,明确优势输导体系及其对油气分布和成藏模式控制作用。结果表明:具备强输导能力(断层输导有效性评价系数小于3.5、启闭系数大于1)并沟通烃源岩层与储层的油源断裂为垂向输导通道,砂地比大于30%的部分连通和完全连通砂体为油气横向运移通道;优势输导体系为强输导断层汇聚面与连通砂体构造凸面脊,控制了油气分布;综合输导体系演化和油气充注过程建立混源供烃-两期充注-断砂复合输导油气成藏模式,第一期成藏期为断层和砂体共同输导至三工河组与头屯河组,而第二期成藏期断层为主要输导通道,垂向输导至头屯河组。The Jurassic reservoirs in the 4th Block of central Junggar Basin exhibit characteristics of mixed source and multi-stage filling.The hydrocarbon migration system,formed by a combination of faults and sand bodies,plays acrucial role in controlling the migration and accumulation of oil and gas.By utilizing geological,logging and seismic data,this study aims to characterize the types and distribution characteristics of this hydrocarbon migration system and elucidate the dominant hydro-carbon migration patterns and their influence on the distribution and accumulation mode of oil and gas.The research reveals that the oil source faults serving as efficient transport channels(indicated by an evaluation coefficient of fault transport effec-tiveness less than 3.5 and a fault opening and closing coefficient greater than 1)act as vertical migration pathways,connect-ing the source rock with the reservoir.Partially and completely connected sand bodies,with a sand-ground ratio greater than 30%,function as lateral migration channels for oil and gas.The predominant hydrocarbon migration system include the T-type fault-sand combination pattern and the staircase-type fault-sand combination pattern.In these patterns,the convergence surface of robust transmission faults aligns with the ridge of connected sand body structures,which controls the distribution of oil and gas reserves.The comprehensive evolution of migration system and the hydrocarbon charging process establish a mod-el for reservoir formation,encompassing mixed sourcing hydrocarbon supply,a two-stage filling process,and fault-sand com-posite transmission and conduction.The fault and sand bodies jointly transpor hydrocarbons during the initial phase of forma-tion,while in the subsequent phase,the fault takes on the primary role as the transport channel.

关 键 词：输导体系 断层 砂岩输导层 控藏作用 侏罗系 准噶尔盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探]