Abstract：Based on interpretation of a great amount of geology data in the West Qaidam Basin, the structure deformation style and structural style of the different stages in Himalaya period have been clearly demonstrated in the paper. With different episodic tectonic evolutions of Western Qaidam Basin, the different structural styles and trap type have been formed in depth. The main tectonic stacking pattern is delineated based on single structure pattern analysis. Further exploration areas have been clarified by analyzing the relationship between oil & gas generation, storage, and trap. The folowing conclusions are obtained：A. The west of Qaidam Basin has been affected by the early, middle, late Himalaya period movements. Mainly with local stretching movement, the early Himalaya movement developed an extensional tectonic style.The middle Himalaya movement developed transpressional structural style. And with horizontal extrusion, the late Himalaya period developed a variety of fauit fold styles. B. Eight styles of structure superposition were concluded by many times of such tectonic movements. The style of inverse structure + syn-sedimentary anticline + fauit-propagated fold has the most advantages in petroleum geological conditions, and it may be the most mature oil & gas exploration area. The style of wedge shaped duplex overthrust + growth ti angle has important instruction meanings for the exploration in Altun piedmont area. Around North Kun and Altun structural zones, the types of thrust fauit of syndeposit + monocline block mountain and thrust fauit of syndeposit + triangular structure are favorable clastic rock reservoir facies belts, and favorable lithological traps. The style of thrust fauit of syndeposit + fauit-propagated old + pop-up structure and paleohigh (ramp) + fauipropagated fold + growth triangle have important practical significance for unconventional reservoir exploration in deep targets, and for lithological reservoir exploration in middle and shallow formations.
