井间地震约束下的高分辨率波阻抗反演方法研究

Study of high-resolution impedance inversion method constrained by crosswell seismic data

井间地震资料频带信息丰富、分辨率高,能够衔接地面地震资料与测井资料。在频带较窄的地面地震资料反演中充分利用井间地震资料的宽频带特征,可以克服常规地震资料反演存在的多解性强和分辨率不高的问题。在基于柯西分布建立地震资料稀疏脉冲反演方法的基础上,引入高频信息丰富的井间地震资料作为反演约束条件,建立井间地震约束下的地面地震高分辨率波阻抗反演目标函数,实现对目标函数的有效求解。实际资料处理表明,井间地震约束下的地面地震波阻抗反演结果与测井曲线吻合较好,并且在保持测井约束反演结果整体特征的基础上提高了反演分辨率,更好地刻画了储层细节特征。

The crosswell seismic data has abundant frequency component information.The resolution of crosswell seismic data is high enough to connect the surface seismic data and the logging data.This feature can be used in the narrow-band surface seismic data inversion to overcome the inherently non-unique problem and the low resolution problem.Taking crosswell seismic data as constraint condition, by using the seismic data sparse spike inversion method based on the Cauchy distribution,the object function of surface seismic highresolution wave impedance inversion was established,and the effective solution of object function was eventually achieved.The actual data processing results show that the surface seismic wave impedance inversion result is matched well with logging data,and the inversion resolution was increased while the overall characteristics of logging constrained inversion result was preserved.Meanwhile,the detail characteristics of reservoir were better described.