【摘要】 渤海海域凹陷由于资料的限制,其沉积相研究多为宏观的区域性研究,制约了储层的精细解释。基于最新采集的高精度地震三维资料,结合地震地层学、层序地层学、地震沉积学等理论方法,开展渤中凹陷西斜坡BZ3-8区块东营组重点目的层,东二下层序高分辨率井震层序分析及其地震沉积学研究。结果表明,研究区南北两侧具有不同的物源体系和沉积相模式。低水位体系域(LST)和高水位体系域(HST)时期,研究区北部物源均形成扇形、朵形的地震多属性及振幅切片异常,对应于扇三角洲沉积;南部物源均形成NE向展布的条带状地震多属性及振幅切片异常,对应于辫状河三角洲沉积。海进体系域(TST)时期,湖平面快速上升导致扇体不发育,仅在研究区北部局部发育小规模的扇三角洲沉积。东二下层序LST(富砂)-TST(富泥)-HST(富砂)的岩相演化规律,充分反映了经典层序地层学理论层序格架中的地层岩相组合分布规律,对储层和烃源岩的预测具有指示意义。更多还原

【Abstract】 For lack of 3D seismic data and logging data,the previous research of sedimentary facies in the Bohai sea sag were not detailed enough for fine reservoir description.Based on the latest high-resolution three-dimensional seismic data,we carried out the high-resolution well-seismic sequence analysis and seismic sedimentology research for the Lower Ed2 of Dongying Formation in the BZ3-8 Block,western slope of Bozhong Sag.Results show that on the north and the south sides of the study area,there occurred different sediment provenance systems and facies.During LST and HST periods,fan-shaped and flower-shaped seismic multi-attributes and amplitude anomalies dominated in the northern part of the study area,indicating fan-delta deposits,while northeast banded seismic multi-attributes and amplitude anomalies were found in the southern part of the study area,that was interpreted as the braided-river delta deposits.During the TST period with the rapid rise in lake level,small-scale fan deltas remained in the north.The sedimentary facies evolution of the system tracts of the sequence of Lower Ed2,from LST(rich sand),TST(rich mud) to HST(rich sand),reflects a classical distribution pattern of stratigraphic lithofacies in a sequence stratigraphic framework,which is significant to reservoir and source rock prediction.更多还原