低孔隙度低渗透率储层弯曲波影响因素分析及渗透率反演

Influence Factors Analysis of Flexural Wave and Permeability Inversion in Low Porosity and Low Permeability Reservoir

低孔隙度低渗透率储层有效性受多种因素影响。利用数值模拟方法,分析了渗透率对低孔隙度低渗透率储层弯曲波中心频率影响,以及低孔隙度低渗透率储层条件下利用弯曲波频移进行渗透率反演的可行性。建立了利用最小二乘法通过弯曲波频移反演储层渗透率的方法,并对实际资料进行了处理。处理结果表明,通过弯曲波频移进行渗透率反演结果与岩心分析、核磁共振等方法获取渗透率有较好的一致性,对裂缝产生渗透性也有较好的反映。

The effectiveness of low porosity and low permeability reservoir is influenced by many factors.Based on numerical simulation, the center frequency variation of flexural wave with different permeabilities is calculated, and the feasibility of permeability inversion using flexural wave frequency shift is analyzed.Furthermore, a new permeability inversion algorithm using flexural wave frequency shift by least square method is established, and is also applied to actual well logging data processing.The result shows that the permeability inverted by flexural wave frequency shift is consistent with that measured by core test and processed by NMR well logging data, and indicates fractures well.