Fortran Program for Correlation of Stratigraphic Time Series

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Date

1978

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Indiana Geological Survey

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https://hdl.handle.net/2022/16731

Abstract

Automatic (computer) correlation of geophysical logs is complicated by stratigraphic thickening (or stretch) from one area to another. Previous algorithms compute the stretch with repeated crosscorrelations of the original logs. Program SPECOR presented in this report uses crosscorrelation of the power spectra of the logs to identify the stretch factor between logs in one simplified operation. Computations are performed in the frequency intervals transformed to a logarithmic scale. Interpolation is required to obtain equally spaced power spectra. Given the stretch, displacement or lag between wells is computed rapidly by correlation processes, without needing to rely on iterative procedures.

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Keywords

Crosscorrelation process, DFT, Interpolation by DFT, Power spectra, Logarithmic scaling

Citation

Kwon, B. D., Blakely, R. F., and Rudman, A. J., 1978, Fortran program for correlation of stratigraphic time series—part 2, Power Spectral Analysis: Indiana Geological Survey Occasional Paper 26, 50 p., 5 figs.

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This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/2.5/ or send a letter to Creative Commons, 543 Howard Street, 5th Floor, San Francisco, California, 94105, USA.

Type

Technical Report

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Occasional Papers - IGWS