【摘要】 利用层序地层学、沉积学原理和方法,在充分使用露头、钻井(测井)和地震资料的基础上,对焉耆盆地博湖坳陷下侏罗统八道湾组进行了层序划分和沉积体系构成样式的研究。建立了焉耆盆地博湖坳陷下侏罗统八道湾组的层序地层格架,将其划分为3个三级层序,它们的层序构成样式主要受控于南部盆缘断裂和坳陷中部的种马场低凸起。种马场古隆起在此时期起到了分割南北沉积分区的作用。每个三级层序由以种马场低凸起为间隔的两个南厚北薄的箕状坳陷沉积构成,低位体系域砂体和高位体系域相对发育,湖扩体系域厚度较薄。在沉积体系构成上以三角洲-湖湾沼泽相的浅水沉积为主,湖泊水体深度不大且分布范围有限。在研究区识别出了南北两大物源体系,即北部主要以辫状河三角洲沉积为主,南部主要以扇三角洲沉积为主。更多还原

【Abstract】 Based on the application of outcrops,well logs,and seismic data,and the principle and method of sequence stratigraphy and sedimentology sequence framework of Badaowan Formation(Jurassic) in Bohu Depression of Yanqi Basin,the architectural styles of sedimentary components were studied.Badaowan Formation(Jurassic) was divided into three 3-order sequences.The style of each sequence was controlled by fault activity of basin border and Zhongmachang low uplift.Zhongmachang paleolift partitioned south sedimentary zone from north zone in this period.Each of the 3-order sequences was constituted by two dustpan shape depressions with steep slope in the south and gentle slope in the north,which was partitioned by Zhongmachang paleolift.LST(lowstand system tract) and HST(highstand system tract) comparatively developed,and the EST(expansion system tract) thickness was thin.The main sedimentary facies are delt-bay swamp facies with shallow and limited water.Southern and northern sedimentary source systems are identified.The northern one mainly develops braided river delta sediments while the southern one mainly develops fan delta sediments.更多还原