子波一致性校正方法在地震资料处理中的应用——以伊朗Kashan区块为例

Application of a wavelet coherence method data processing-for Iran Kashan block as an example.

在地表条件复杂多变地区的地震勘探中,由于表层结构横向变化大,野外地震资料采集通常采用多种震源的交互施工方式,造成不同震源激发的原始单炮资料品质差异较大。为消除差异,常规处理多采用频率匹配、振幅匹配和反褶积等方法来调整不同震源单炮资料的频率和相位关系,但这种处理方式效率很低,甚至会影响叠前处理的效果。为此,对利用子波一致性校正消除不同震源原始单炮资料品质差异的方法进行了探讨。阐述了, 子波一致性校正方法的基本原理,即以振幅一致性校正为基础,根据反射系数一致性原理,利用Robinson褶积模型,通过相同位置接收不同震源激发得到的2种原始单炮资料的内在关系,设计匹配子波滤波器。伊朗 Kashan区块勘探程度较低,地表条件复杂多变,野外采集采用了可控震源和炸药震源激发方式。在资料处理中,采用了子波一致性校正方法,较好地解决了炸药震源与可控震源激发单炮资料品质差异大的问题。

Alternative sources are usually used for seismic acquisition due to laterally varying surface structure in complex area, which may cause obvious quality difference on raw data. Based on amplitude coherence and Robinson convolution model, wavelet coherence can shape the wavelet consistency of single shot for one source by matching wavelet filter. It is of high computating speed, better stability and good self-adaptability, the quality difference on raw data from by different sources can be removed effectively, the amplitude, frequency and phase of two kinds of raw data tend to be more coherent. This method enables the quality difference to be well removed in data processing for Iran Kashan block.