储集层多尺度裂缝高效数值模拟模型

针对储集层复杂裂缝多尺度特征与现有裂缝数值模拟方法不匹配的问题，建立了多尺度裂缝高效数值模拟三重介质混合模型。模型对多尺度裂缝进行分级处理，对导流能力强、跨度广的大尺度裂缝，采用离散裂缝模型进行显性表征；对导流能力较弱、跨度窄的中尺度和小尺度裂缝，采用传统连续介质模型分别进行双重介质等效和基质增强等效，并提出一套与非结构化网格相适应的形状因子、裂缝孔隙度和渗透率的属性等效方法。基于商业模拟器及矿场实际井资料验证了模型的可靠性。数值模拟结果表明，模型能有效模拟多尺度复杂缝网发育的储集层，与传统连续介质模型和离散裂缝模型相比，模拟效率能大幅提高，同时具有较高的模拟精度。

An effective numerical simulation model of multi-scale fractures in reservoir

In consideration of the mismatching between multi-scale feature of complex fractures in reservoir and their current numerical simulation method, an efficient triple-medium hybrid model for multi-scale fracture was proposed to classify multi-scale fractures. With high conductivity and wide span, the large-scale fractures were explicitly characterized by discrete fracture model, while the meso-scale and small-scale fractures featured with low conductivity and narrow span were upscaling to dual-medium grid and matrix grid through traditional continuum medium model respectively. Moreover, a property equivalent method of shape factor, fracture porosity and permeability in accordance with unstructured grid was put forward. The model reliability was validated by commercial simulators and actual well data of the field. The results show that the model can effectively simulate the reservoir with multi-scale complex fracture. By contrast with both traditional continuous medium model and discrete fracture model, the hybrid model can improve simulation efficiency greatly and remain a high accuracy as well.