层析静校正技术在永新地区的应用

The techniques for tomographic static correction applied in Yongxin Area

在表层风化带速度横向变化较大的地区,做好静校正是取得高质量叠加剖面的重要一步,而确定表层低降速带速度是做好层析静校正的关键。常规的折射波方法在复杂近地表条件下很难求得正确的低速带速度和静校正量。实验结果表明,利用层析反演技术可由初至波旅行时结合微测井、小折射等野外调查资料,通过射线追踪方法反演表层低速带速度模型并求得静校正量。实际资料处理结果可看出明显改善了复杂近地表地区叠加剖面的质量。

In the area with complex zone of weathering where the lateral velocity varies greatly, it is important to get correct statics in order to achieve the high-quality stacked sections, and the key to get correct tomographic statics is to acquire accurate velocity for weathering layer. It is difficult to acquire the correct velocity for the weathering layer and the static correction by using the conventional refraction technique when the zone of weathering is complex. Experimental result shows that the tomographic inversion using primary wave travel time incorporated with microlog and mic-refraction data can obtain the near surface velocity model and the static correction values.