山前复杂带三维地震资料处理技术探讨

PROCESSING TECHNIQUE DISCUSSIONS FOR 3D SEISMIC DATA IN FOOTHILL COMPLEX BELT

通过对山前复杂带三维地震资料的特点和处理难点的实例分析,认为地震资料处理的每个环节均不能采取单一技术、一步到位的方法,而应采用逐步逼近的方法去解决问题。要先将复杂的问题分割,针对各个处理环节中的难点,以技术理论和适用条件为基础进行反复试验,总结出适应山前复杂带资料特点的处理技术,并分步实施、组合使用。为此,在对山前复杂带三维资料处理中的问题进行讨论的基础上,对三维分步静校正、组合去噪、串联反褶积、三维DMO和三步法串联偏移等技术进行综合应用,实践证实取得了比较好的效果。

By dealing with the case studies, the paper analyzed the characteristics and difficulties of the 3D seismic data acquired in foothill complex belt, and proposed that the stepwise approach other than a single technique should be applied during the seismic data processing. First, we should divide the complex problems into several parts, then, aimed at the difficulties in each processing cycle, perform repeated tests on the basis of the technical theory and application conditions; then conclude the processing techniques that are suitable for the characteristics of the seismic data in foothill complex belt, moreover, these techniques should be implemented stepwise, and should be combined and applied. On the basis of the discussions on the problem of 3D seismic data processing in pediment complex belt, the paper implemented the integrative application of such techniques as 3D stepwise static correction, simultaneous noise attenuation technique, cascading deconvolution, 3D DMO and three-pass cascading migration and so on, the real data application indicates that this method has gained relatively good results.