基于常规测井资料的裂缝孔隙度评价模型

The Fracture Porosity Evaluation Model Based on Conventional Logging Data

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 important indices for fracture validity evaluation,which accurate calculation is related to the evaluation quality.Selection of the evaluation model is the key of calculation.Based on a large number of predecessors' studies,three kinds of fracture porosity evaluation models are summarized.They are conventional resistivity model,reconstruction acoustic time curve model and photoelectric absorption model.It is thought through comprehensive evaluation that curve reconstruction model and photoelectricabsorption section model can be used in the condition of smooth side wall,but electrical current resistivity model has best effect.