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基于目前常用的大地电磁反演方法,通过目标函数中模型约束项构制不同,介绍了OCCAM、Focus、Sharp boundary和Smoothness constrained least-squares等反演算法理论,并结合一维、二维理论模型的反演效果,分析比较了各自的优劣点,在同一误差水平条件下,反演效果依赖于其目标函数的数学表达式.建议在实际工作中根据具体目标任务,结合不同反演算法的优劣点制定反演方案或反演组合来综合解译地质目标体,最后给出实际工作中MT剖面资料的反演解释实例.
Based on the current commonly used method of geomagnetic inversion, the inversion algorithm theory such as OCCAM, Focus, Sharp boundary and Smoothness constrained least-squares is introduced through the structural constraints of the model in the objective function. Combined with the one-dimensional and two-dimensional theoretical models The inversion results are analyzed and compared, and under the same error level, the inversion effect depends on the mathematical expression of its objective function. It is suggested that in practical work, according to the specific objectives and tasks, combined with different inversion algorithms The advantages and disadvantages of the formulation of inversion programs or inversion combination to interpret the geological target body, and finally gives an example of the actual interpretation of the MT section of the data interpretation.