| Abstract: | The FORTRAN algorithm described in this report was developed for applying corrections to normal resistivity logs of any electrode spacing for the effects of drilling mud of known resistivity in boreholes of variable diameter. The corrections are based on Schlumberger departure curves that are applicable to normal logs made with a standard Schlumberger electric logging probe with an electrode diameter of 8.5 cm (3.35 in). The FORTRAN algorithm has been generalized to accommodate logs made with other probes with different electrode diameters. Two simplifying assumptions used by Schlumberger in developing the departure curves also apply to the algorithm: (1) bed thickness is assumed to be infinite (at least 10 times larger than the electrode spacing), and (2) invasion of drilling mud into the formation is assumed to be negligible.
* The use of a trade name does not necessarily constitute endorsement by the U.S. Geological Survey. |
| Genre: | USGS Numbered Series |
| ProdID: | 11069 |
| Citation Author: | Scott, James Henry |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | 12 leaves ;27 cm.; (13 p. - PGS) |
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| Citation Publisher: | U.S. Geological Survey, |
| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 78-669 |
| Citation Search Results Text: | A FORTRAN algorithm for correcting normal resistivity logs for borehole diameter and mud resistivity; 1978; OFR; 78-669; Scott, James Henry |
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| Citation Year: | 1978 |
| Type: | citation/reference |
| Text: | A FORTRAN algorithm for correcting normal resistivity logs for borehole diameter and mud resistivity; 1978; OFR; 78-669; Scott, James Henry |
| URL (THUMBNAIL): | http://pubs.usgs.gov/of/1978/0669/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/of/1978/0669/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, |
