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基于褶积模型的波阻抗反演技术 ,由于受地震子波带限性质的影响 ,对反演结果的高频信息不能进行合理的约束。要想反演出比较准确的波阻抗高频信息 ,必须施加合理的约束条件。利用测井资料与层位解释结果构造的常规约束条件 ,在井点是可靠的 ,但横向离开井点一定距离后 ,约束条件的误差就会很大 ,从而导致约束反演结果的错误。本文从约束反演方法的模型试算出发 ,提出的以声波测井资料的最大和最小速度、速度包络、中值滤波及速度差结合作为约束条件的新方法 ,可以有效地降低噪声对反演结果的影响 ,减少解的非唯一性 ,提高井点以外地震资料反演结果的可信度。
Based on the convolution model of wave impedance inversion technology, due to the nature of the seismic wavelet band limit, the high frequency information of inversion results can not be reasonably constrained. In order to reverse the high-frequency information of wave impedance, we must impose reasonable constraints. Conventional constraints constructed by well logging data and horizon interpretation results are reliable at well points. However, when the horizontal distance from the well point is a certain distance, the error of the constraint conditions will be large, resulting in errors in the constraint inversion results. In this paper, based on the model test of constrained inversion method, a new method that combines the maximum and minimum velocities of sonic logging data, velocity envelope, median filtering and velocity difference is taken as a constraint to effectively reduce the noise The effect of the results, reduce the non-uniqueness of the solution and improve the credibility of the inversion results of seismic data beyond the well point.