煤系气地震勘探多次波分析及压制策略

Multiple wave analysis and suppression strategy for seismic exploration of coal measures gas

鄂尔多斯盆地北部多次波异常发育,严重影响中深部目标层地震资料的信噪比,给地质解释及煤系气赋存特征研究带来很大的困难。通过分析某研究区的原始资料,结合地层特点,总结了多次波成因、类型和特征,采用多道预测反褶积、高精度Radon变换、F-K滤波的优化组合策略取得了满意的多次波压制效果,提高了目标层地震资料的成像质量。

The abnormal development of multiple waves in the north of Ordos Basin seriously affects the signal-to-noise ratio(SNR) of seismic data in the middle and deep target layer,and brings great difficulties to the study of geological interpretation and gas occurrence characteristics of coal measures.Based on the analysis of the original data of a study area and the characteristics of strata,the genesis,type and characteristics of multiple waves were summarized,and the optimal combination strategy of multi-channel predictive deconvolution,high-precision Radon transform and F-K filtering has obtained the satisfactory multi-wave pressing effect,and the imaging quality of the seismic data of the target layer was improved.