渤海海域黄河口凹陷新近系多油水系统油藏成因分析

Genetic analysis on Neogene multiple oil & water system fault-block reservoirs in the sea area of Yellow River Mouth Sag

为明确同类油田的开发调整方向和潜力目标,以滚动勘探开发为目的,以A油田为例,探讨了黄河口凹陷中央构造脊北端新近系多油水系统油藏成因。储层与油源断层的有效配置是控制该类油气聚集的关键因素。基于已开发油田井震一体化精细地层对比和储层展布研究,细化了储层空间展布,并结合油源断层特征剖析,系统分析了储-断耦合对油气分布的控制作用。首先,油源断裂垂向活动强弱的差异与储层的匹配控制着油气垂向上主要聚集层位;其次,断裂平面发育程度的差异与储层展布的耦合控制着油气在平面上的分布;再次,储-断接触关系影响着油气的富集和赋存规律。

To clarify the development orientation and potential target in the similar fields,taking A oilfield located at the northern end of the central structural ridge of Yellow River Mouth Sag as an example,genesis of Neogene multiple oil water system fault-block reservoirs is systematically researched.The effective matching of sand reservoir and fault connecting source rocks is a key factor that controls hydrocarbon accumulation.The reservoir distribution of A oilfield is studied on the basis of fine stratigraphic classification and reservoir characterization by the integration of well logs and seismic data.Reservoir characterization combined with the analysis of source-connected faults,the controlling effect of reservoir-fault coupling on oil and gas distribution is systematically studied.Firstly,the vertical distribution of hydrocarbon accumulation may be controlled by a ＂coupling＂ between the differences of vertical fault activity and relevant sand reservoir distribution.Secondly,the horizontal distribution of hydrocarbon may be controlled by the ＂coupling＂ between the differences in horizontal fault activity and the abundance of sand reservoir.Finally,the contact patterns of sand reservoir and fault affect the oil and gas accumulation.