辽中凹陷东营组重力流发育机制及沉积构成  

FORMATION MECHANISM AND FACIES ARCHITECTURE OF GRAVITY CURRENT OF DONGYING FORMATION IN LIAOZHONG SAG

作　　者：吴小红[1,2] 吕修祥[1,2] 加东辉[3] 滕玉波[3] 赖维成[3] 

机构地区：[1]中国石油大学盆地与油藏研究中心 [2]中国石油大学石油天然气成藏机理教育部重点实验室,北京昌平102249 [3]中国海洋石油有限公司天津分公司,天津塘沽300452

出　　处：《西南石油大学学报（自然科学版）》2009年第4期18-23,共6页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：中国海洋石油总公司重点科技攻关项目(SC06TJ-TQL-004)

摘　　要：辽中凹陷锦州区块东营组发育三角洲滑塌浊积扇、远岸水下扇和近岸水下扇等重力流沉积。在高分辨率层序地层划分和对比的基础上,通过区域沉积体系分析,探讨了各类水下重力流沉积的形成条件,建立了相应的发育模式,分析认为:物源系统、坡折类型和湖平面变化的耦合关系决定着沉积体的基本特征,包括类型、层序位置、发育部位和规模大小等。进一步研究表明,各类重力流沉积内部构成差异明显,坡折类型及组合样式对其控制作用明显,表现为:坡折组合的规模和复杂状况决定了砂体平面展布的分异状况;坡折带的类型和坡度决定着沟道体系的发育情况;坡折下方微地貌构建的次级坡折带控制着砂体的分配,尤其是优质砂体的富集位置。沟道化是断陷湖盆重力流沉积的一大特色,探讨了其有别于经典海相重力流相模式的原因。对岩性圈闭的勘探有一定的借鉴意义。Slump turbidite fans,nearshore subaqueous fans and offshore subaqueous fans developed in Dongying Formation of Jinzhou area in Liao zhong sag.On the basis of classification and correlation of the high resolution sequence stratigraphy and analysis of depositional system,forming conditions and development models are discussed.The coupling relationship of sedimentary source system,types of slope-break zones and lacustrine level fluctuation affect the characteristics of gravity current,such as types,sequence position,development area and scale.After comparing and summarizing,it is recognized the type,association and styles of slope-break zones control facies architecture.In detail,scale and complex conditions dominates spatial variations of sand bodies,type and gradient determines whether channel develops,and sub-slope-break zones composed of micro-physiognomy affect distribution of sand bodies,especially enrichment location.Channel system developing in faulted basin differs from it in marine and the reason is summed up.The study and cognition will be used for improving the exploration of lithologic trap.

关 键 词：辽中凹陷 重力流 发育机制 沉积构成 坡折带 

分 类 号：TE121.3[石油与天然气工程—油气勘探]