Exploration in the Minnelusa Sandstone using a digital well log database

  • Daniel E. Shier
Article
  • 36 Downloads

Abstract

The Pennsylvanian Minnelusa Sandstone is one of the most prolific oil producing formations in the Powder River Basin of Wyoming. Virtually all petroleum accumulation is in stratigraphic traps, with much production from paleotopographic highs beneath a regional unconformity. Oil is trapped in dune sands. Both thickness of sandstones and their cementation vary greatly over short distances. The exploration area comprises 60 townships and 3400 wells. About 95% of the wells have sonic γ ray logs. The database includes cartographic data, formation, and zone tops picked by a single geologist, and normalized γ ray and sonic logs. Great emphasis is placed on data quality. Newly released logs are added monthly. This database provides the exploration geologist with a new way of doing subsurface interpretation. Free from demands of gathering and tabulating basic data, the geologist is able to do more creative work. A new and original concept—one that would take several person-months of manual effort to work out—can be mapped out and evaluated in less than a week.

Keywords

Minnelusa digital well log database 

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References

  1. Doveton, J. H. and E. Bornemann, 1981, Log normalization by trend surface area analysis: The Log Analyst, v. 22, no. 4, p. 3–9.Google Scholar
  2. Lang, W. J., Jr., 1980, SPWLA ad hoc calibration committee report: Porosity log calibrations: Log Anal., v. 21, no. 2, p. 14–19.Google Scholar
  3. Neinast, B. S. and C. C. Knox, 1973, Normalization of well log data: Professional well log analysts, 14th Annual Symposium Paper I.Google Scholar
  4. Shier, D. E., 1982, Digital well log data—An exploration tool of the 1980's: Oil Gas Jour., March 8, p. 206–228.Google Scholar

Copyright information

© Plenum Publishing Corporation 1985

Authors and Affiliations

  • Daniel E. Shier
    • 1
  1. 1.GoldenUSA

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