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位场勘探是一种较为成熟的地球物理勘探手段,然而其数据反演中存在的深度分辨率不足问题阻碍了其进一步发展.文章在深入研究位场数据反演理论的基础上,详细分析了位场反演中普遍存在的深度分辨率不足问题,分析了造成这种现象的主要客观原因.研究利用深度分辨率成图技术对给定位场反演问题的深度分辨率进行定量刻画.针对造成分辨率不足的原因提出了几点改进措施:利用离散Picard定理分析问题的适定水平,结合傅立叶系数与奇异值对比图进行合理的噪声剔除;反演计算之前结合DRP技术,给出较为合理的地下剖分方式;合理的数据加权.文章使用理论二维重力模型进行说明,最后将其应用于复杂三维重力模型,试验表明上述措施对于改进位场反演深度分辨率有一定的效果.
Site exploration is a mature geophysical exploration method, however, the problem of insufficient depth resolution in data inversion hinders its further development.Based on the further study of the field data inversion theory, the paper analyzes in detail The common problem of insufficient depth resolution in field inversion is analyzed and the main objective reasons for this phenomenon are analyzed.The depth resolution of a given field is quantitatively described by using depth- The reasons for the lack of resolution are put forward several improvements: the use of discrete Picard theorem analysis of the appropriate level of the problem, combined with the Fourier coefficient and the singular value of the comparison chart for reasonable noise rejection; inversion calculation before combining DRP technology gives a more reasonable Underground subdivision method and reasonable data weighting.The article uses the theoretical two-dimensional gravity model to explain, and finally applies it to the complex three-dimensional gravity model. The experiment shows that the above measures have a certain effect on improving the depth resolution of the field inversion.