SEQUENCE STRATIGRAPHIC MODELS AND SEDIMENTARY EVOLUTION OF PINGHU AND HUAGANG FORMATIONS IN XIHU TROUGH
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摘要: 应用层序地层学原理,依据钻井地质、地球物理、分析化验等资料,将西湖凹陷主要勘探目的层平湖组和花港组划分出SⅢ1-SⅢ5五个三级层序,并建立了三级层序的层序地层模式,其中SⅢ1、SⅢ2可划分出断坡带型层序地层模式、水下低隆遮挡型层序地层模式和半地堑型层序地层模式、SⅢ3充填补齐型层序地层模式、SⅢ4、SⅢ5坳陷型层序地层模式,分析探讨了层序格架内沉积演化过程与机制及不同层序地层模式的石油地质意义。Abstract: The Pinghu Formation and Huagang Formation in the Xihu Depression are the main targets for ail exploration in this region, They could be divided into five third-order sequences of SⅢ1, SⅢ2, SⅢ3, SⅢ4, SⅢ5, according to subsurface geology, geophysics and laboratory testing data. For the sequences of SⅢ1 and SⅢ2, we proposed three stratigraphic models, i.e. fault terrace, subwater uplift and half graben models. A infilling model was constructed for the sequence SⅢ3, and a downwarp model for the sequences of SⅢ4 and SⅢ5. Sedimentary evolutionary history within the sequence framework was reconstructed, and its implication for petroleum geology discussed.
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Key words:
- Xihu depression /
- sequence stratigraphic models /
- sedimentary evolution /
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