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塔里木库车幼陷的盐下含油气构造是“西气东输”工程的资源基础。盐下含油气构造的地震勘探面临盐上复杂地层倾角大、地表起伏剧烈、地层物性差异大和巨厚膏盐层屏蔽影响造成的一些严重问题，如地震资料信噪比低、静校正问题突出、成像困难等，直接影响了盐下含油气构造的勘探成功率；针对这些问题，在勘探中形成了一套有效的采集、处理、解释技术，如精细的表层结构调查技术、因地制宜的观测系统设计、配套的静校正技术、有效的叠前深度偏移和构造建模技术等，应用这套技术有效地解决了该区盐下含油气构造的勘探问题，发现了一批大中型盐下含油气构造；所提出的这套勘探技术思路对类似地区的勘探具有重要的借鉴价值。

Key Techniques of Seismic Exploration for Subsalt Oil & Gas Structure in Kuche Sag

??Sub salt oil gas structures are the main gas source for the project of "West-East Gas Transmission" engineering.The seismic exploration of sub salt oil gas structures faces some severe problems caused by big dip of the overlying formations,strong up and down of the surface,great variance of the formation physical characteristics and shielding effects of the thick gyps salt beds.The problems include the signal/noise ratio low,the static correction troublesome,and the imaging locating difficult,etc.which influence the success rate of sub salt oil gas structure exploration directly.Aiming to the problems,the effective techniques for acquisition,processing and interpretation of seismic data have been developed,such as the fine survey technique of surface structures,the layout design in line with local conditions,the matching technique of static correction,the effective pre stack depth migration and the structure modeling technique,etc.Applications of the above mentioned techniques have properly solved the problems for sub salt oil gas structure exploration and found several big or medium size sub salt oil gas structures in this area.The exploration ideas are useful to the similar areas.