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在传统电性源瞬变电磁资料解释中,常常采用Bz/T求取视电阻率值,由此带来Bz/T计算全程视电阻率多解性.而Bz随电阻率变化是单值函数,由Bz计算全程视电阻率具有减少多解性的优势.为了研究接地源瞬变电磁B场全程视电阻率,文中首先研究了接地源瞬变电磁法Bz和Bz/T响应值随电阻率的变化特性,然后设计不同的地电模型,采用二分搜索算法对B场全程视电阻率进行计算,结果表明全程视电阻率对电性目标体分辨率高,分层能力强,能较好地反映地电断面的信息;另外,全程视电阻率仅与地层的电性结构有关,与收发距无关,便于野外进行接地源瞬变电磁近源测量.在实际应用中,通过把观测的二次感应电压转换成磁场微分数据,再对磁场微分数据进行积分,求取B场数据,并进而求取视电阻率,取得了较好的应用效果.
In the traditional interpretation of electromagnetic transient electromagnetic source data, often used 求 Bz / T as the apparent resistivity value, resulting in Bz / T calculated throughout the apparent resistivity of the multi-solution. Bz with resistivity changes Is a single-valued function, the calculation of full apparent resistivity by Bz has the advantage of reducing the multi-solution.In order to study the apparent resistivity of the B source transient electromagnetic field B, first studied the grounding transient electromagnetic method Bz and Bz / T response value changes with the resistivity characteristics, and then design different geoelectric model, using binary search algorithm to calculate the full field resistivity B field, the results show that the entire apparent resistivity of the electrical target body resolution, hierarchical ability In addition, the entire apparent resistivity is only related to the electrical structure of the strata and has nothing to do with the transceiver, it is easy for the field to carry out near-field source electromagnetic transient measurement of ground source.In practical applications, By converting the observed secondary induced voltage into magnetic field differential data and then integrating the magnetic field differential data to obtain B field data, and further determining the apparent resistivity, a good application effect is achieved.