Correlation of geologic logs with spectral methods |
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| Authors: | Byung-Doo Kwon and Albert J Rudman |
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| Institution: | (1) Department of Geology, Indiana University, 47401 Bloomington, Indiana, USA;(2) Korea Research Institute of Geoscience, Seoul, Korea |
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| Abstract: | Spectral studies of geologic logs demonstrate that automatic well—log correlation can be processed more efficiently in the frequency domain. Cross correlation of the power spectra of well logs identifies the direction and degree of thickening of stratigraphic sequences between two wells. Given the stretch, the displacement between logs is computed by correlation processes without relying on iterative procedures. Beginning with digitized log data of unequal lengths, power spectra are computed. The stretch factor between the two logs is observed as a difference in frequency scaling. A transform to logarithmic frequencies converts the spectra to a form that reduces the scaling effect of the frequencies to a simple displacement between the plots. A Lagrange interpolation procedure permits cross correlation of the two spectra with a variable window size. The peak value of the resultant correlation function identifies the displacement between the spectra and this, in turn, permits calculation of the stretch factor. |
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| Keywords: | lithologic correlation spectral analysis |
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