【摘要】 通过对岩心、钻井及地震资料的研究,并结合粒度分析及地震相等分析手段,在沾河断陷下白垩统淘淇河组共确定出3种层序界面类型,识别出5个层序界面及4个三级层序。认为淘淇河组属于断陷盆地深陷扩张期—断坳转换期发育的一套沉积地层,从层序SQ1—SQ4断陷陡坡带、凹陷带及缓坡带分别发育冲积扇—扇三角洲、半深湖—深湖—湖底扇、扇三角洲—辫状河三角洲沉积体系,为盆地深陷期沉积产物;在层序SQ3—SQ4断陷陡坡带、凹陷带及缓坡带分别发育扇三角洲、湖泊、辫状河三角洲沉积,为断陷盆地断坳转换期的沉积产物。同沉积断裂的构造活动是控制层序发育及沉积演化的主要因素。综合分析表明,SQ1层序内部烃源岩发育、并具有较好的储集、运移及封盖条件,为研究区最有利的生储盖组合。更多还原

【Abstract】 According to drilling core,bore well,seismic data,particle size analysis and seismic facies analysis,we confirmed three sequence types of the Low Cretaceous Taoqihe Formation in the Zhanhe rift,and identified five sequence boundaries and four three-order sequences.The Taoqihe Formation is a set of sedimentary formation which belonged to the period of basin large expanding and fault sag conversion in the rift basin.The sedimentary system of alluvial fan,half deep lake-deep lake-sublacutrine fan,and fan delta-braid river delta is developed in the acitc region,hollow zone,and slop region,respectively,from SQ1 to SQ2,which was a sedimentary product during the period of the basin large expanding.The sedimentary system of fan delta,lacustrine,and braid river delta is developed in the acitc region,hollow zone,and slop region,respectively,from SQ3 to SQ4,which was a sedimentary product during the period of the fault sag conversion.The tectonic activity of syndeposit fault is the main factor in controlling the development of sequence and sedimentary evolution.By comprehensive analysis,there is not only development of source rock,but also development of preferable reservoir rock,migration and seal condition in the SQ1,which is the favorable area of source-reservoir-caprock assemblages.更多还原