【摘要】 针对煤层气藏储层天然裂缝发育,采用DFN离散裂缝网络模型的裂缝性储层建模方法和思路。以沁端区块煤层气藏为例,首先,建立了煤层气藏三维构造模型,在构造模型的基础上,利用序贯高斯随机建模方法,建立了煤层气藏基质属性模型,为裂缝模型的建立与离散粗化奠定基础。然后,以测井解释的裂缝密度、长度、倾角、方位等统计数据为基础,在地震裂缝预测的属性体约束条件下,建立全区裂缝密度分布模型。最后,以裂缝密度分布模型为控制条件,利用离散裂缝网络技术(discrete fracture network,DFN),建立了沁端区块煤层气藏离散裂缝网络模型及其裂缝孔隙度、渗透率等属性模型。通过对模型的验证分析,认为该模型能客观真实地反应煤层气藏储层天然裂缝的几何特征和分布形态,为该区块煤层气藏数值模拟提供了地质基础和依据。更多还原

【Abstract】 For CBM reservoir,natural fracture development,an approach of Discrete Fracture Network( DFN)model of fractured reservoir is used. For the CBM reservoir of Qinduan block as an example,first of all,the CBM reservoir three-dimensional structure model is established,on the basis of the model,using sequential gauss random modeling method,established the matrix attribute model of CBM reservoir,for laying a foundation for establishment and discrete crack model of coarsening. Then,in order to well logging interpretation of fracture density,length,angle,azimuth and other statistical data as the foundation,the seismic fracture prediction attributes constraint conditions,the distribution of fracture density model is set up. Finally,fracture density distribution models as constraint conditions,the use of Discrete Fracture Network( DFN) technology,establish the CBM reservoir in this end block discrete fracture network model and the model of the fracture porosity,permeability and other properties. Through validation of the model analysis,think that this model can objectively fairly reflect the geometrical characteristics of the natural fracture and CBM reservoir distribution pattern for the blocks in CBM reservoir numerical simulation provides a geological foundation and basis.更多还原