Abstract:

Full-space apparent resistivity formulas and its all-time solution methods are important components in underground transient electromagnetic theory. For the purpose of exploring all-time apparent resistivity solving method in full-space medium, translation algorithm used to solve the problem in half-space was introduced and studied in full-space. Meanwhile, theoretical data, modeling data and measured data were adopted to analyze the validity and precision of translation algorithm in full-space data processing and interpretation. The results indicate that, translation algorithm and conventional all-time solving method have a same theoretical basis, but the former can acquire unique solution which other methods can not do. Furthermore, it achieves a good application effect to adopt the joint interpretation with time cross section plotted by using intercept parameter and apparent resistivity section map. Therefore, translation algorithm used in data processing and interpretation of underground transient electromagnetic method can not only achieve satisfactory applicability and accuracy, but also posses a wider application prospect.

Key words: transient electromagnetic method, all-time apparent resistivity, translation algorithm, full-space, modeling