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以沉积学、油田地质学等为基础，并且结合钻井、试油及分析化验资料，进行大洼-海外河地区复式油气聚集带的石油地质特征综合评价，分析其成藏模式。结合表明：丰富的油源条件、广泛发育的多套储集体，多种类型圈闭及油气沿大洼断裂带两侧运移的主要指向，使本区具备了油气富集条件；在构造和沉积作用控制下，使大洼－海外河地区各种油气藏在平面上广泛分布，在空间上按不同层次，具有一定成因联系的不同类型油气藏有规律地组合在一起，形成大洼－海外河地区复式油气用集带。
On the basis of sedimentology, oilfield geology, etc., combined with drilling, oil testing and analysis of laboratory data, the comprehensive evaluation of petroleum geology characteristics of the compound oil and gas accumulation belt in Dawa-Outer River region is carried out to analyze the hydrocarbon accumulation pattern. The results show that abundant oil source conditions, widely distributed sets of reservoirs, various types of traps and the major migration of oil and gas along the two sides of the Dawa fault zone make the area have oil and gas accumulation conditions. Under the control of sedimentation, all kinds of oil and gas reservoirs in Dawa-Oversea River Area are widely distributed in the plane, and different types of reservoirs with different genesis and genesis in space are regularly combined to form Dawa-oversea River area with oil and gas collection zone.