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通过对延长组烃源岩条件、沉积埋藏—热演化史、储集层特征综合分析,认为三叠系延长组两套优质烃源岩分布面积广,有机质含量高,早白垩世晚期为油气充注期,存在正常式、侧变式、顶生式三种生储盖组合类型。由于延长组烃源岩油气运移动力缺乏浮力作用,油藏主要分布在近生油坳陷的水下分流河道和河口坝砂岩储集层中。
Based on the comprehensive analysis of the source rocks, the burial-thermal evolution history and the characteristics of reservoirs in the Yanchang Formation, two sets of high-quality source rocks of the Triassic Yanchang Formation are widely distributed and have high organic matter content. In the early Cretaceous, Note, there are normal type, side change, top three types of storage and cover combination. Due to the lack of buoyancy in the motive force of hydrocarbon migration in the Yanchang Formation, the reservoirs are mainly distributed in the submarine distributary channel and estuary dam sandstone reservoirs in the near oil depression.