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针对在四川盆地西北部枯坝场潜伏构造上钻探上三叠统须家河组二段上亚段，于构造高部位产气或为干层，而在构造低部位产大气的情况。据地震和实钻资料，研究了气２物地质特征、沉积环境、区内三角洲前缘水下分流河道砂体形态及岩性圈闭气藏的形成，并采用多种方法的特殊处理，建立了河道砂岩的含气地震响应模式。

PRIMARY DISCUSSION ON OLD CHANNEL LOTHOLOGIC TRAP OF XU-2 UPPER SUBMEMBER OF ZHEBACHANG BURIAL STRUCTURE IN NORTHWEST SICHUAN

??Aimed at the conditions that little acs or dry wells appear at the top of Xu-2 Upper Submember of Upper Traffic Series of Zhebachang burial structure in the northwest pert of Sichuan akin and that gteat gas is drilled in the bottom of the structure,the geological characteristics and depositional environment of the gas reservoir.the sandbody morphology in underwater Shunting channel in delay front in the area and the formation of lithologic trap gas reservoir are studied and treated by several methods in the light of geology and drilling daal to set up a gas bearing seismic response mode.The result shows Xu-2 Upper Submember is the turset zone in the area and the channel sandstone of the submember is the key of obtaining gas.