Investigation of the effects of dipping layers on the electrical sounding curves and their interpretation

Category Geophysic
Group GSI.IR
Location 23th symposium on geosciences
Holding Date 05 May 2008

Abstract:
      Usual methods and available computer software for interpretation of electrical sounding data can be used only if we have horizontal, homogeneous layers and sharp interfaces between the layers. If the layers are dipping (i.e. their dips exceeds 10 degrees), the major developed interpretational methods and available computer software will not be applicable. In this paper, the effects of dipping layers on the apparent resistivity sounding responses are studied and the method of interpretation is investigated on the basis of obtained mathematical relations for the case.
   There are several difficulties in the interpretation of apparent resistivity sounding data obtained from dipping layered earth. The case generally is not interpretable due to the complexity. However, simplified cases of dipping layered earth models, such as the dipping two-layer earth case presented in this paper, can be interpreted. For this, first the electric potential and then the apparent resistivity parameters are extracted from related mathematical relations. Consequently, master curves and computer programs for interpretation in such cases can be generated. Due to different cases of dipping layers in nature, modeling and analysis of the problem is not generally possible.

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