河套盆地临河坳陷构造脊成因模式及其与油气成藏的关系  

Genetic patterns of structural ridges in Linhe Depression of Hetao Basin and their relationship with oil and gas accumulation

作　　者：常德双 万照飞 刘冬民 王鹤华 王春晓 CHANG Deshuang;WAN Zhaofei;LIU Dongmin;WANG Hehua;WANG Chunxiao(CNPC BGP Inc.,Zhuozhou 072750,China)

机构地区：[1]中国石油东方地球物理勘探有限责任公司,河北涿州072750

出　　处：《大庆石油地质与开发》2024年第6期11-19,共9页Petroleum Geology & Oilfield Development in Daqing

摘　　要：近年来河套盆地临河坳陷勘探取得重要发现,落实了亿吨级的探明储量,但不同构造之间油藏规模存在明显差异。为了搞清构造脊与油气成藏和富集之间的关系,以区域地质、地震和钻井资料为基础,结合构造演化分析,研究了构造脊的主要成因模式及其对成藏要素的控制作用。结果表明:临河坳陷构造脊非常发育,其形成主要与断层活动相关,成因可划分为鼻状脊、断背脊、断块脊和转换脊4种模式;参考其规模又可分为大型构造脊和小型构造脊2类,而小型构造脊往往是发育在大型构造脊背景之上的次级构造脊;构造脊在形成过程中对“运和圈”2个要素具有较强的控制作用,是运和圈耦合的有利载体;在成藏过程中大型构造脊、小型构造脊和生烃灶在空间上相互配置,可形成“源-汇-聚”接力式油气运聚模式;烃源岩提供油源,大型构造脊提供有利汇聚背景,小型构造脊提供油气聚集场所;在与烃源岩配置关系好的大型构造脊之上,小型构造脊越是靠近洼槽,油源条件越充足,油气越为富集。研究成果可为临河坳陷下一步的油气勘探提供一定理论指导。In recent years,the exploration of Linhe Depression in Hetao Basin has made important discoveries,and proved reserves of 100 million tons have been realized,but different structures have obvious different reservoir sizes.In order to understand relationship between structural ridges and hydrocarbon accumulation and enrichment,based on regional geological,seismic and drilling data,combined with structural evolution analysis,the main genetic patterns of structural ridges and their controlling effects on hydrocarbon accumulation elements are studied.The results show that structural ridges of Linhe Depression are very developed,and their formation are mainly related to fault activities.Their genesis are divided into 4 patterns including nose ridge,faulted anticlinal ridge,fault block ridge and transitional ridge.According to their scale,they are divided into 2 types including large structural ridge and small structural ridge,while small structural ridge is usually secondary structural ridge developed on the background of large structural ridge.In the process of formation,structural ridges have strong controlling effect on 2 elements of“migration and trap”,and are favorable carriers for coupling of migration and trap.In the process of accumulation,large structural ridges,small structural ridges and hydrocarbon generation kitchen are spatially configured with each other,forming“source-sink-accumulation”relay pattern of hydrocarbon migration and accumulation.Source rock provides oil source,large structural ridges provide favorable convergence background,and small structural ridges provide oil and accumulation site.On large structural ridges which have good configuration relationship with source rocks,the closer the small structural ridges are to the trough,the more abundant the oil source condition is,and the more oil and gas are enriched.The research provides theoretical guidance for further oil and gas exploration of Linhe Depression.

关 键 词：河套盆地 临河坳陷 构造脊 成因模式 油气成藏 

分 类 号：TE121.2[石油与天然气工程—油气勘探]