波场延拓静校正在复杂地表区的应用及分析

在西部复杂地表地区地震勘探中,近地表剧烈变化引起的静校正问题尤为突出,静校正成为地震资料处理中的一项重要工作。常规的静校正技术均基于地表一致性假设,在复杂地表地区已经不再适用。为了适应复杂地表地区特点,基于非地表一致性假设的波场延拓静校正被提出,相对常规静校正技术具有明显优势。通过模型正演和实际资料处理效果,对比了波场延拓静校正与常规地表一致性静校正方法,并定量地分析了近地表速度模型对波场延拓静校正效果的影响。

Application and analysis of wave field continuation static correction in area with complex surface

In the seismic exploration of the west area with complex surface, the problem of static correction caused by the variation of near surface is particularly prominent, so static correction is an important work in seismic data processing. The conventional static correction techniques are based on the surface consistency hypothesis, which is no longer applicable to the area with complex surface. In order to adapt to the characteristics of area with complex surface, based on non-consistencyhypothesis of surface, the wave field continuation static correction is proposed, theoretical analysis model andapplication of real data show that wave field continuation static correction could adapt to the severe change of the near surface, this method has obvious advantagesrelative to conventional static correction technology.