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THE AUTOMATIC FITTING OF A RESISTIVITY SOUNDING BY A GEOMETRICAL PROGRESSION OF DEPTHS *
Author(s) -
MARSDEN D.
Publication year - 1973
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.1973.tb00027.x
Subject(s) - electrical resistivity and conductivity , computation , depth sounding , interpretation (philosophy) , geology , convolution (computer science) , mineralogy , matching (statistics) , gemology , algorithm , geometry , mathematics , engineering geology , statistics , computer science , artificial intelligence , engineering , electrical engineering , paleontology , oceanography , volcanism , artificial neural network , tectonics , programming language
A bstract The problem of interpretation of geoelectrical resistivity soundings has been studied and a compromise method of interpretation developed. A simple depth sequence of increasing bed thickness is taken and resistivities assigned to the various layers so that a good fit is obtained to the observed apparent resistivity curve. An initial estimate of the resistivities is made by a direct method but the model is then altered to give an improved fit by the indirect method of curve matching. The whole method is computerized and input data to the computer program consists of spacings and apparent resistivities. The method is extremely rapid, about one third of the computation time is devoted to obtaining the resistivity transform by the method of convolution. A normal type of solution, incorporating additional information if necessary, can also be obtained.