Coutrol Factors of Oil and Gas Enrichment and Exploration Direction in Mesozoic of Jingchuan Area in Eerdiosi Basin

Jingchuan area, located in southeast of Eerduosi basin, have experienced multistage and multi - type depositional evolution including lake facies of Yanchang stage in Late Triassic. fluviaI and paludal facics in Jurassic and nuvial and lake facies in Cretaceous.Mesozoic. with several sets of favorable oil sources and reservoir rocks, havc large exploration potential. Thestructure was high in the west and low in the cast inIndo - Chinese epoch, while it was low in the west and high in thc east (south), this structural inversion controlled the direction of oil and gas migration and accumulation later. The oil sources and effective reservoirs in this area were the important factors resulting in the formation of oil and gas pools. Combination of favorable sedimentary facies zones (sandbodies) with structural high is the main basis for area and well location selection. Exploration direction is selecting the favorable NW -SE oil and gas accumulation zone as the main exploration area and layer Chang 6 as the main target and focusing on search for structural-lithologic combination oil pools.