渤海湾盆地黄河口凹陷新近系油气富集模式与成藏主控因素定量评价

长期以来油气成藏定量研究是油气勘探研究的难点。文章基于三维地震、测井以及录井等资料，对渤海湾盆地黄河口凹陷新近系油气成藏条件、富集模式和成藏主控因素进行了系统研究。指出黄河口凹陷新近系油气主要富集在走滑反转带和断隆带两类构造单元，具有两种不同的成藏模式。其中，走滑反转带新近系的油气运移能力受油源断层的活动强度和古近系区域盖层厚度共同控制；断隆带新近系油气运移的能力受仓储层的输导脊和切仓断裂共同控制。并建立了两类不同成藏模式下表征油气输导能力的定量模型和公式。进一步指出，新近系构造-岩性圈闭在具备供烃条件时，其成藏规模仍受到“断-砂”接触程度的控制。砂体与油源断层的总接触面积越大，其内部油气充满度一般越高。

Quantitative evaluation of hydrocarbon accumulation pattern and the controlling factors in the Neogene of Huanghekou Sag,Bohai Bay Basin

The quantitative study on hydrocarbon accumulation has always been a thorny problem in hydrocarbon exploration.In combining with a series of analyses including 3D seismic and logging data, we carry out a comprehensive study focusing on the setting and pattern of, as well as factors controlling hydrocarbon accumulation in the Neogene of Huanghe-kou Sag.The results show that the hydrocarbons mainly enrich in inverted strike-slip and faulted uplift structural belts, demonstrating two distinct accumulation patterns.The hydrocarbon migration of the Neogene in the strike-slip inverted belt is controlled jointly by the activity intensity of source rock-rooted fault and regional seal thickness in the Paleogene; while that of the Neogene in the faulted uplift belt is controlled jointly by the transporting ridges and late faults cutting through the reservoir.Further, the quantitative evaluation model and formulae characterizing the hydrocarbon migration capacity under the two accumulation patterns are established.In addition to the hydrocarbon oil source conditions, the scale of hydrocarbon accumulation is also controlled by the contact area between fault and sand body.The larger the total contact area between sand bodies and source rock-rooted faults, the higher the fill factor of the reservoir will generally be.