【摘要】 分流河道和河口坝砂体是川中—川南地区上三叠统须家河组主要的有利储集砂体。依据露头、岩心、钻井、测井资料设计单一河口坝、河道和叠置河道砂体的地质模型,开展模型正演,得出地震响应模型,并以此指导各种有利砂体在地震资料中的识别,预测了须家河组有利储集砂体的平面展布。河口坝砂体呈底平顶凸的地震反射特征,河道砂体呈顶平底凸的上超充填反射特征,多期叠置河道呈透镜状—波状、具有中强振幅、中低频率的特征,并验证了模型正演所获得的反射特征与地震相和测井相是吻合的。该区河道、河口坝有利储集砂体广泛分布,主要发育在除合1井—合川5井以南、河包场和合川13井以北、通4—岳5井以外的广大地区。更多还原

【Abstract】 The favorable reservoir sandbodies of Xujiahe formation in central Sichuan-south Sichuan region is mouth bar,ground and underwater delta distributary channels.Based on comprehensive study of outcrop,core and logging data,single river channel,single mouth bar and multiple overlapping channels geological models of reservoir sandbodies is proposed.The seismic response characteristics of these models are displayed by means of forward modeling and it is beneficial for identification of different reser-voir sandbodies using seismic data.The distributing of the favorable reservoir sandbodies is furthermore predicted.Underwater delta distributary channels and mouth bar are widely distributed in the areas except south of He 1 well-He 5 well,north of He-baochang and Hechuan 13 well,Tong 4 well-Yue 5 well.更多还原