AY 地区构造位置位于四川盆地川中古隆起平缓构造区中部，为一南东—北西向倾斜的单斜。 综合 地质、测井等资料，对研究区上三叠统须家河组展开了地震层序地层研究。 研究结果表明，地震同相轴的 上超方向、层序等 T0厚度、下切河谷走向等信息指示了物源区可能位于研究区的南部或东南部。 据薄片 资料的岩屑成分排除了紧邻研究区东南部的泸州古隆起作为物源区的可能性。 推测研究区须家河组物源 区位于研究区南部或东南部的“黔中古陆”或“江南古陆”。 该项研究成果对于四川盆地上三叠统须家河 组的下一步勘探具有指导意义。

AY area which shows a monoclinal structure in the direction of northwest is located in the central part of gentle structure zone, Central Sichuan Basin, Southwest China. This paper carried out seismic sequence research of the Upper Triassic Xujiahe Formation with comprehensive analysis of geological, seismic and well logging data. The result shows that the source of the Xujiahe Formation may be located in the south or southeast of the AY area by means of analyzing onlap direction of seismic event, TWT thickness contour map of seismic sequences and incised valley trend. Sandstone composition data excluded the possibility that Luzhou paleo-uplift become the provenance. We supposed that “Qianzhong ancient land” and “Jiangnan ancient land” may be the source of the Xujiahe Formation in Central Sichuan Basin. This viewpoint gives some hints to the further exploration and prospect of the Xujiahe Formation in Sichuan Basin.