碳酸盐岩裂缝性油藏双重介质渗流表征研究

Study on Dual Media Seepage Characterization of Carbonate Fractured Reservoir

F油田是渤海地区最大的碳酸盐岩裂缝性油田,依据目前的地震预测资料和地质模式认识已不足以准确地对其裂缝渗流特征进行定量描述,油田储量动静矛盾突出。为解决此问题,综合潜山钻井、测井、地震等静态资料对F油田碳酸盐岩潜山储层进行了划分,并通过双重介质模型分析影响油田储量动静矛盾的主控因素。首先,通过驱替敏感性三维数模分析,进一步认识储层裂缝的分布情况;其次,结合地震预测和地质模式,将合理的数模参数调整转化为确定性裂缝建模约束条件,通过多轮次地质模型与数值模拟往复反馈研究对裂缝渗流非均质性进行准确刻画。在此基础上,总结了不同储层的开发特征及见水规律,设计了油田开发优化方案。

F Oilfield is the largest carbonate fractured oilfield in Bohai Sea.Relying on the current seismic prediction and geological model,it is difficult to accurately and quantitatively describe the fracture seepage characteristics,resulting in prominent dynamic and static contradictions in the oilfield.Based on the static data of buried hill drilling,logging and seismic,the classification of carbonate buried hill reservoir types is discussed in F Oilfield,and the main controlling factors affecting the dynamic and static contradiction of reserves are analyzed through the dual medium model.Firstly,through the three-dimensional numerical simulation analysis of displacement sensitivity,the distribution of reservoir fractures is further understood.Secondly,combined with seismic prediction and geological model,the reasonable adjustment of mathematical model parameters is transformed into deterministic constraint conditions for fracture modeling,and the heterogeneity of fracture seepage is accurately characterized through multiple rounds of geological model and numerical simulation reciprocating feedback research.On this basis,the development characteristics and water breakthrough laws under different types of reservoir models are summarized to guide the optimization of the development plan of F Oilfield.