川西须家河组前陆盆地构造层序及沉积充填响应特征  

Tectono-stratigraphy and sedimentary infill characteristics of Xujiahe Formation in western Sichuan foreland basin

作　　者：刘君龙[1] 纪友亮[1] 杨克明[2] 宋虹玉 刘大卫[1] 王天云[1] 郑占义 

机构地区：[1]中国石油大学油气资源与探测国家重点实验室,北京102249 [2]中国石油化工股份有限公司西南分公司,四川成都610081 [3]中国石油大庆油田榆树林油田有限责任公司,黑龙江大庆163000

出　　处：《中国石油大学学报（自然科学版）》2015年第6期11-23,共13页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金项目(41272157);国家科技重大专项(2011ZX05003-002)

摘　　要：川西坳陷在须家河组沉积期为典型的周缘前陆盆地,受幕式造山运动的控制,其构造层序具有'二元体系域'的特征,即强烈造山期体系域和构造宁静期体系域。构造运动不仅控制着前陆盆地的层序地层发育,也会分配层序内部的沉积物充填。基于Vail经典层序地层学理论,综合利用地震、测录井等资料,分析研究区内构造层序类型及主控因素,阐明不同构造层序内部的沉积充填响应特征。结果表明:须家河组在前陆盆地期(须二段—须五段)可以划分为2个构造层序,其中须二段和须四段为强烈造山期体系域,须三段和须五段为构造宁静期体系域;构造运动是控制研究区构造层序发育的主要因素;强烈造山期体系域以粗粒沉积为主,发育冲积扇—辫状河三角洲—湖泊沉积体系,构造宁静期体系域以细粒沉积为主,发育曲流河三角洲—滨浅湖沉积体系。The tectono-stratigraphy in Xujiahe Formation is characterized by binary system tracts ( tectonically active and tec-tonically stable) in western Sichuan depression, coincided with its episodic-orogenesis evolution phases as a peripheral fore-land basin. Tectonic activity is suggested not just to control sequence stratigraphy development, but also to assign the sedi-ment-infilling patterns within sequence successions. Based on Vail's sequence stratigraphy theory, integration of data from boreholes with seismic reflection allowed the analysis of tectono-stratigraphy types and their main controlling factors, as well as the illustration of sedimentary characteristics in or between orogeny episodes. The results show that Xujiahe Formation's sub-members ( T3 x2-T3 x5 ) alternatively shift between the binary system tracts:T3 x2 and T3 x4 belong to the tectonically ac-tive system tracts, while T3 x3 and T3 x5 are the tectonically stable ones. Tectonic activity controls tectono-stratigraphy develop-ment. Coarse grained deposition dominates in the tectonically active system tracts, as seen in alluvial fan-braided river delta-lacustrine facies which prevail in T3 x2 and T3 x4;on the other hand fine grained sediments distribute widely in the tectonically stable system tracts, as evidenced by meandering river delta-lacustrine and swamp facies which predominate in T3 x3 and T3 x5 .

关 键 词：构造层序 二元体系域 沉积充填响应 须家河组 川西前陆盆地 

分 类 号：P624.6[天文地球—地质矿产勘探]