The study on the reservoir forming conditions, including hydrocarbon origin, structure location, reservoir physical property, sand body thickness, and so on, of the discovered hydrocarbon reservoirs in the Pubei\|Putaogou and Honglian oil fields in the west of Tuha basin, reveals that the sand body which approaches to the hydrocarbon generating centre and oil sources fault, best allocation to structure, good physical property and thin thickness are the main controlling factors for the formation of lithologic hydrocarbon reservoirs. The key factors for reservoirs being far away from hydrocarbon kitchen are oil sources fault and thin and good physical property sand layer located in the limb of structure. The key factors for reservoirs in the hydrocarbon kitchen is good physical property sand layer located in the slope of structure. We summarized two lithologic hydrocarbon reservoir distribution pattern that are distal-source structure limb lithologic hydrocarbon reservoir and inner\|depression uplift slope lithologic hydrocarbon reservoir. The Upper Jurassic delta front sand body in the Pubei and Honglian areas, and the Sanjianfang Formation delta front sand body in high place of structure in the Putaogou area are the most important exploration targets.