提高沙埝—花庄北地震成像质量的针对性处理

Data processing approaches to improve the quality of the processed data from Shanian-Huazhuangbei

沙埝—花庄北地区地震地质条件复杂,尤其是该区目的层火成岩广泛发育,导致目的层地震信号弱,信噪比低,成像困难。在充分分析火成岩产状与地震反射的关系后,提出了通过多方法组合能量补偿、多域去噪、精细速度分析和叠前时间偏移等针对性处理,增强火成岩成像同步增强目标层成像的处理思路。最终处理结果显示:目的层波组层次清晰、层序内幕有效反射增强、不整合清晰可识别、断点清楚,成像质量得到了有效提高。

Igneous rocks are well developed in Shanian-Huazhuangbei. Seismic signals from the target are weak, poor in signal-to-noise ratio, and smearing in imaging. From the investigation of the relationship between occurrence of igneous rock and seismic reflection, we proposed some pertinent data processing methods such as energy compensation concurrently with multiple techniques, denoising in multiple domain, fine velocity analysis, and prestack time migration to improve both the imaging of igneous rock and the target. Processed results show that the events of the target are clear and definite, the reflections in sequence are enhanced, unconformity and faults are recognizable.