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静校正一直是地震资料处理中的一个关键环节。常规的静校正方法是基于地表一致性假设条件,但效果不明显,本文通过对水平层状介质下的理论静校正量的计算公式推导,分析了实际静校正量与近地表速度、厚度及反射界面深度和接收偏移距之间的关系。基于水平层状介质模型和基岩出露的典型山地模型,比较了理论静校正量和常规方法计算的静校正量之间的差异,阐述了进行非地表一致性静校正的必要性。通过对典型地区的实际资料采用地表一致性静校正方法和非地表一致性静校正方法进行处理后的叠加效果进行分析,结果表明采用非地表一致性静校正方法才能够更好地成像。
Static correction has always been a key aspect of seismic data processing. Conventional static correction method is based on the assumption of surface consistency, but the effect is not obvious. Based on the calculation formula of the theoretical static correction under horizontal layered media, this paper analyzes the relationship between the actual static correction and near surface velocity, thickness and reflection Relationship between interface depth and receive offset. Based on the typical layered model of media and the typical mountain model of bedrock, the difference between the theoretical static correction and the static correction calculated by the conventional method is compared, and the necessity of non-surface consistency static correction is expounded. By analyzing the superposition effect of the actual data of typical areas by the surface-consistent static correction method and the non-surface-consistent static correction method, the results show that the non-surface-consistent static correction method can better image the data.