Identification of sandstone body types by computer method
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Three sandstone body types—progradational (coarsening upward), aggradational (coarsening downward), and blockν—can be identified by computer using the least-squares method. The basic data are the digital gamma (γ) ray and sonic log data. Other logs such as SP and resistivity (or conductivity) may also be used with minor changes in the computer program. A statistical program to compute the percent of each of these three types in a specified geologic unit was also written and run for several wells in the Beaufort Basin, Canada. An areal mapping of these calculated results shows the features of progradational sedimentation in this area. The percentage of progradational sandstones increases northward in a seaward direction. The amount of sandstones usually decreases in this direction.
Key wordslog interpretation sandstone body least squares
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- Fisher, W. L., Brown, Jr, L. F., Scott, A. J., and McGowen, J. H., 1969, Delta systems in the exploration for oil and gas, a research colloquium; Bureau of Econ. Geol., Univ. of Texas, Austin, Texas.Google Scholar
- Magara, K., 1978, Compaction and fluid migration—practical petroleum geology, Appendix 3-2: Elsevier, Amsterdam, New York, Oxford, 319 p.Google Scholar
- Ruoff, W. A., 1976, A technique for interpreting depositional environments of sandstones from the SP log utilizing the computer, Log Analyst, v. 17, no. 4.Google Scholar
- Saitta, S., and Visher, G. S., 1968, Subsurface study of the southern portion of the Bluejacket-Bartlesville sandstone, Oklahoma, Ed.: G. S. Visher, Oklahoma Geological Society.Google Scholar
- Schlumberger, 1969, Log interpretation principles, Schlumberger, New York.Google Scholar
- Visher, G. S., Saitta, S., and Phares, R. S., 1971, Pennsylvanian delta patterns and petroleum occurrences in eastern Oklahoma, A.A.P.G., v. 55, p. 1206–1230.Google Scholar