基于页岩储层的离散裂缝网络建模技术

Discrete fracture network modeling technology based on shale reservoirs

压裂改造对页岩气的开发必不可少。页岩储层内部高度发育的天然裂缝会对水力裂缝产生影响,天然裂缝的开启与延伸对页岩储层的改造体积有着非常大的影响。因此天然裂缝的合理建模对页岩储层的压裂模拟至关重要。研究了页岩储层天然裂缝建模方法,选择更能体现页岩储层非均质性的离散裂缝网络模型(DFN),并从裂缝来源、裂缝属性分布方面研究了DFN模型的建立,为页岩储层地质模型的精确建立提供了保障。

Fracturing is essential for the development of shale gas. The natural fractures that are highly developed within the shale reservoir will have an effect on the hydraulic fractures,and the opening and extension of the natural fractures will have a significant effect on the stimulated reservoir volume. Therefore,the rational modeling of natural fractures is critical to the fracturing simulation of shale reservoirs. In this work,the modeling method of natural fractures in shale reservoirs was analyzed,and the discrete fractured network model which reflected the heterogeneity of shale reservoir was selected. The establishment of DFN model was studied from the source of fractures and the distribution of fractures. It provided a guarantee to the precise establishment of the reservoir geological model.