The degree of exploration in deep zones belowthe third member of Shahejie Formation in Lengjia-Leijia area is low. Based on the fine seismic structural interpretation and sedimentology study, the available data fromthe study area and adjacent areas are used to analyze the formation conditions of the deep reservoirs. The result shows that the NE main fault controls the regional structure and depositional patterns in Lengjia-Leijia area, which affects the oil and gas migration and accumulation, and the oil geological condition in the deep strata is favorable. There developed two sets of high quality source rocks in the third and fourth members of Shahejie Formation in Chenjia sub-depression, with an organic hydrocarbon generation intensity greater than 500×10⁴ t/km², which provides abundant oil sources for the surrounding areas. Favorable reservoir rocks exist in the forth member and lower third member of Shahejie Formation, Mesozoic and Archean, and good regional seals developed well in the middle section of the third member of Shahejie Formation. There are various traps, favorable oil and gas migration and accumulation conditions and great exploration potential. However, the factors affecting the reservoir formation are complex and there exist compound reservoirs. It is suggested that the next promising exploration targets should be primarily centered on the hill and lithologic reservoirs.