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为了揭示饶阳凹陷沙河街组沙三下亚段层序地层特征及沉积演化规律,在区域沉积背景分析基础上,利用岩心、测井及地震资料,建立沙三下亚段层序地层格架,并对沉积演化规律进行了研究.认为沙三下亚段为一个完整的三级层序,可划分为低位、湖侵和高位3个体系域,主要发育辫状河三角洲、扇三角洲和湖泊等3种沉积相类型,辫状河三角洲发育于断陷西部缓坡带,扇三角洲发育于断陷东部陡坡带,湖泊发育于断陷中部.低位域、高位域时期辫状河三角洲、扇三角洲规模较大,储集体发育,湖侵域时期湖盆扩张,烃源岩发育.结果表明:高位域时期的水下分流河道储层物性最好,为Ⅰ类有利区;低位域时期的水下分流河道、席状砂储层物性次之,为Ⅱ类有利区,此类砂体与湖侵域烃源岩形成有利的生储盖组合,是下步勘探的有利方向.
In order to reveal the characteristics of sequence stratigraphy and sedimentary evolution of the Shahejie Formation in the Lower Reaches of Shahejie Formation in Raoyang Sag, based on the analysis of regional sedimentary background, the core sequence, log and seismic data were used to establish the sequence stratigraphic framework , And studied the sedimentary evolution law.It is considered that the Lower 3rd Member of Shahejie Formation is a complete third-order sequence, which can be divided into three lowstands, lakeshore and upperstands, mainly composed of braided river delta, fan delta and lake The braided river delta developed in the gentle ramp zone of the west of the fault depression, the fan delta developed in the steep slope zone in the east of the fault depression, and the lake developed in the central part of the fault depression. The braided river delta and fan delta in the low- And the reservoirs developed.The lake basin expanded and the source rocks developed during the period of lake invasion.The results show that the reservoir properties of underwater distributary channel reservoirs in the high stage are the best, The second is the class II favorable zone, followed by the formation of a favorable reservoir-cap combination with the source rocks of the lake intrusion, which is the favorable direction for further exploration.