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目前,国内外普遍利用双侧向测井资料评价裂缝参数。常用的裂缝孔隙模型包括:Sibbit模型、Pezard-Anderson模型、网状模型及三维有限元模型。从原理上对各模型建模条件与方法进行了分析,并对其适用条件进行了总结。Sibbit模型重点考虑了孔隙流体的影响,没有考虑裂缝产状的影响,参数较多,难以准确确定,精度较低;Pezard-Anderson模型适用于近水平及近垂直裂缝孔隙评价,实际地层以发育中、高角度裂缝为主,模型适用性受到限制,精度较低;网状模型适用于网状裂缝发育段的裂缝孔隙评价,精度较高,适用性较强;三维有限元模型可计算任意产状的单条裂缝孔隙度,并给出裂缝产状的判断方法,适用性较强。通过与目标区成像测井解释结果对比,对各种常用模型的适用条件进行了分析与总结,并对裂缝孔隙度进行了评价,取得了较好效果。
At present, the dual-lateral logging data are widely used both at home and abroad to evaluate fracture parameters. Common fracture pore models include: Sibbit model, Pezard-Anderson model, mesh model and three-dimensional finite element model. In principle, the modeling conditions and methods of each model are analyzed, and the applicable conditions are summarized. The Sibbit model mainly considers the influence of pore fluid, and does not consider the effect of fracture yield. It has many parameters, which can not be accurately determined and the accuracy is low. The Pezard-Anderson model is suitable for pore evaluation of near horizontal and near vertical fractures. The actual formation is under development , High-angle cracks, the applicability of the model is limited and the precision is low. The mesh model is suitable for the evaluation of fracture pores in the development stage of mesh fractures with high precision and strong applicability. The three-dimensional finite element model can calculate the arbitrary occurrence Of the single fracture porosity, and to determine the method of judgment of fracture, applicability is strong. By comparing with the interpretation results of imaging logging in the target area, the applicable conditions of various commonly used models are analyzed and summarized, and the fracture porosity is evaluated. The good results are obtained.