表层模型层析反演静校正在煤田勘探中的应用

Surface Model Tomographic Inversion Static Correction Application in Coal Exploration

基于复杂山区地表剧烈起伏,速度纵、横向变化大的情况,对提高静校正精度以取得良好地震成像效果进行分析研究。无论是假设前提还是实际应用效果,建立在水平折射面假设基础之上折射波静校正方法均不适应。表层模型层析反演根据正演初至时间与实际初至时间的误差来修正速度模型,经反复迭代,最终达到要求的误差精度。不受地表及近地表结构纵横向变化的约束,从而达到提高静校正质量的目的。

Based on the complex mountainous area surface severe ups and downs, big change of vertical and lateral veloc- ity, achieved good seismic imaging, should improve the precision of static correction. Both assumptions and the practical application effect, the horizontal reflection plane assumption refraction static correction method didn＇t adapt. Surface model tomographic inversion based on the beginning of time and the error of the actual first arrival time corrected velocity model, after repeated iterations, eventually achieved the requirements of the error precision. Independent of the horizontal change of the surface and near surface structure, achieved the goal of improving the quality of static correction.