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裂缝孔隙度是裂缝有效性评价的重要指标之一,其能否准确计算直接关系到裂缝有效性的评价质量,而裂缝孔隙度评价模型的选择是计算的关键。在前人大量研究基础上,总结出三种裂缝孔隙度评价模型:常规电阻率模型;重构声波时差曲线模型;光电吸收模型。综合评价认为,井壁光滑的情况下可使用特征曲线重构模型和光电吸收截面模型,但电流电阻率模型效果最好。
Fracture porosity is one of the most important indexes in the evaluation of fracture effectiveness. Whether it can accurately calculate the evaluation quality which is directly related to fracture effectiveness, the choice of fracture porosity evaluation model is the key to the calculation. Based on a large number of previous studies, three fracture porosity evaluation models are summarized: the conventional resistivity model; the reconstructed acoustic jet lag curve model; the photoelectric absorption model. According to the comprehensive evaluation, the characteristic curve reconstruction model and the photoelectric absorption cross section model can be used when the borehole is smooth, but the current resistivity model is the best.