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山前带、黄土塬等复杂近地表地区已成为目前勘探的重点,因其地表起伏剧烈、高差严重等的现象,近地表建模技术严重影响着静校正的准确性.近地表速度建模的方法有很多,包括层析法,折射法,面波法等,旅行时层析法是目前速度建模的一种准确高效的方法,其基于射线理论,利用地震波旅行时信息来反演地下速度.本文利用初至旅行时层析进行近地表建模,并在起伏异常体模型上进行了近地表建模,模型测试说明了本文中方法在山前带等复杂近地表地区进行静校正等的有效性.
The frontal belt and loess plateau and other complex near-surface areas have become the focus of exploration at present, and the near-surface modeling technology has a serious impact on the accuracy of static correction because of the phenomena of severe surface fluctuation and serious elevation difference. There are many methods, including chromatography, refraction, surface wave method, travel time tomography is an accurate and efficient method of speed modeling, based on the ray theory, the use of seismic travel time to retrieve the information underground Speed.This paper makes use of first-arrival trip-time tomography for near-surface modeling and near-surface modeling on undulating body model, and the model test shows that the method in this paper performs static correction in the complex foreland zone Effectiveness.