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以断坡控砂为指导,结合层序地层分析,综合应用地震和钻井等资料,对西湖凹陷平湖地区平湖组沉积相进行了系统分析,确定了其主要发育的沉积相。扇沉积主要为洪积扇、近岸水下扇和浊积扇,在断陷期早期、中期发育。三角洲沉积主要为辫状河三角洲、扇三角洲,在断陷期中期、晚期发育。潮坪沉积以改造陆源沉积为主,在断陷期早期、中期发育。建立了砂体沉积模式,明确了平湖组各砂层组沉积相展布规律。
Based on the analysis of sequence stratigraphy and the application of seismic data and drilling data, the sedimentary facies of Pinghu Formation in Pinghu area of Xihu Depression are systematically analyzed and the main developed sedimentary facies are determined. The fan deposits are mainly alluvial fans, nearshore subaqueous fans and turbidite fans, which developed in the early and middle stages of fault depression. Delta sediments are mainly braided river delta and fan delta, which developed in the middle and late stages of the rift period. Tidal flat sediments to transform the terrigenous sediments mainly in the early fault phase, the mid-development. The sedimentary model of sand body is established, and the deposition regularity of sedimentary facies in each sand layer of Pinghu Formation is defined.