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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。
Through the study of core, drilling and seismic data, combined with particle size analysis and seismic equivalent analysis, three types of sequence boundary types were identified in the Lower Cretaceous Taoqihe Formation in Zhanhe Fault Depression, and five sequence boundaries And four third-level sequence. It is considered that the Taoqihe Formation belongs to a set of sedimentary strata developed in the fault depression basin during the period of expansion-fault depression transition. Alluvial fan-fan delta, alluvial fan and fan delta are developed from the steep slope belt, sag zone and gentle slope zone of sequence SQ1-SQ4 Deep-lacustrine-lacustrine fan, fan delta-braided river delta sedimentary system, which is the sedimentary product of the basin deep depression. In the steep slope belt, sag zone and gentle slope belt of sequence SQ3-SQ4 faulting, fan delta, lake, The deposition of braided river delta is the sedimentary product of fault-depression transition in the faulted basin. The tectonic activities of synsedimentary faults are the main factors controlling the development of sequence stratigraphy and sedimentary evolution. Comprehensive analysis shows that the source rocks within the SQ1 sequence are well developed and have good reservoir, migration and sealing conditions, which are the most favorable reservoir-cap combination in the study area.