弯曲波反演渗透率方法研究

On Inversion Method of the Flexural Wave Permeability

渗透率是储层有效性评价的重要表征。分析了利用弯曲波反演渗透率的理论基础。以各向同性饱和流体孔隙介质充液井孔中声场传播理论为基础,通过正演计算得到弯曲波的衰减,结合实测弯曲波衰减,通过最小二乘法实现了地层渗透率的反演,并给出利用弯曲波反演渗透率的8个处理步骤。对实际测井资料的反演结果表明,弯曲波反演的渗透率曲线与岩心和常规曲线反映的储层性质吻合,和其他渗透率结果具有较好的一致性,其结果能满足现场工程的应用。

Permeability is an important parameter of reservoir evaluation and characterization of reservoir effectiveness evaluation.Analyzed is the theoretical basis using the flexural wave to do formation permeability inversion.Based on the wave-field propagation theory of the isotropic saturated porous media in a fluid-filled borehole,flexural wave attenuation is obtained by forward modeling calculation.And the formation permeability inversion combining with the measured flexural wave attenuation is carried out by the least squares method.The paper splits inversion process of the flexural wave permeability into eight steps.The inversion results to the field data show that permeability curve obtained from the flexural wave inversion are consistent with that from cores and conventional curves reflecting the reservoir properties,in addition,the permeability and other results also have good consistency,and the result can meet the engineering applications.