轴约束重力数据聚焦反演研究

发布时间：2018-07-06 06:31

本文选题：重力数据 + 轴约束　；参考：《中国地质大学(北京)》2015年硕士论文

【摘要】：聚焦反演的根本思想是在反演过程中加入最小体积、最小转动惯量等约束条件,使得反演结果异常集中分布在一定的范围内,从而能够更清晰地反映地质体的密度分界面,更准确的确定异常体大小和位置。本文首先对位场反演方法原理进行基础性研究,实现当前常用的基于光滑约束、深度加权约束的反演算法,实现加入最小体积、最小转动惯量等约束条件时的聚焦反演算法,通过对比聚焦反演与光滑反演的效果,更深入的了解了不同方法反演结果的特点。此外,基于聚焦反演的基本理论,引入深度加权约束,改善了聚焦反演效果,并在最小转动惯量约束聚焦反演的基础上对轴约束聚焦反演进行了深入研究,实现了多轴和有限长轴约束聚焦反演。最后,通过理论模型测试,对比不同轴约束条件下的重力数据聚焦反演结果,从模型剖分大小、约束轴参数、约束轴个数和约束轴长度四个方面研究了轴约束聚焦反演的优点与不足,为能够更合理、有效的使用轴约束重力数据聚焦反演方法提供有力的依据。
[Abstract]:The basic idea of focusing inversion is to add the minimum volume, minimum moment of inertia and other constraints in the inversion process, so that the inversion results are concentrated in a certain range, so that the density interface of the geological body can be reflected more clearly. Determine the size and location of the exception more accurately. In this paper, the principle of potential field inversion method is studied at first, and the inversion algorithm based on smooth constraint and depth weighted constraint is realized, and the focusing inversion algorithm with minimum volume, minimum moment of inertia and other constraints is realized. By comparing the effect of focus inversion and smooth inversion, the characteristics of different inversion results are further understood. In addition, based on the basic theory of focusing inversion, depth weighting constraints are introduced to improve the effect of focusing inversion, and the axial constraint focusing inversion is deeply studied on the basis of minimum moment of inertia constraint focusing inversion. Multi-axis and finite-axis constrained focusing inversion is realized. Finally, through the theoretical model test, the results of gravity data focusing inversion under different axial constraints are compared, and the size of the model and the constraint axis parameters are divided from the model. The advantages and disadvantages of axial constrained focusing inversion are studied from four aspects: the number of constraint axes and the length of constraint axes, which provides a powerful basis for the more reasonable and effective use of axial constrained gravity data focusing inversion methods.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.14

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