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Spontaneous (SP) log

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Correspondence between <b>spontaneous</b> potential (<b>SP</b>) <b>log</b> amplitudes and charac...
Published: 18 October 2011
Fig. 2 Correspondence between spontaneous potential (SP) log amplitudes and characteristic values (μ max , μ min and M) of the petrophysical reservoir model (D, E), changes in the content of clay minerals according to different cement water-holding capacities (C, G). "Conservation principles More
Proceedings Papers

Paper presented at the SPWLA 48th Annual Logging Symposium, June 3–6, 2007
Paper Number: SPWLA-2007-ZZ
... and if mud salinity is different from formation water salinity, dipole layers form along borehole wall, layer boundaries and invasion zone boundaries. The dipole layers produce Spontaneous Potential (SP) in the borehole. So, for long time, well logging analysts have used the SP curve to determine permeable...
Journal Articles
J Pet Technol 63 (05): 83–85.
Paper Number: SPE-0511-0083-JPT
Published: 01 May 2011
... Upstream Oil & Gas chemical composition log analysis breakthrough real-time measurement real time system waterflooding Brine te potential intelligent well inflow mineral surface SP signal gradient spontaneous potential water front reservoir electrode ek potential salinity saturation...
Proceedings Papers

Paper presented at the SPWLA 56th Annual Logging Symposium, July 18–22, 2015
Paper Number: SPWLA-2015-B
... Abstract Spontaneous Potential (SP) and Gamma Ray (GR) logs are often the only measurements available in many old hydrocarbon fields. Reliable coupled petrophysical interpretation of GR and SP logs requires previous accurate quantitative calibration for the effects of shale laminations, water...
Journal Articles
J Pet Technol 24 (02): 151–153.
Paper Number: SPE-3570-PA
Published: 01 February 1972
..., the Spontaneous Potential (SP) Log. As implied by Gillingham, zonal differences between SP logs run in wells while they are shut in and during injection are related to flow rate. This technique has the sensitivity to profile most open-hole or fiber-glass-lined fresh water injection wells, but lacks...
Proceedings Papers

Paper presented at the SPWLA 43rd Annual Logging Symposium, June 2–5, 2002
Paper Number: SPWLA-2002-AAA
... ABSTRACT Formation water resistivity (Rw) is one of the most important parameters in log interpretation. Spontaneous potential or SP logs have been used in Rw calculation, which is especially effective in clean sand. However, when the sand contains clay, the clay interferes with the ion...
Proceedings Papers

Paper presented at the Fall Meeting of the Society of Petroleum Engineers of AIME, October 3–6, 1971
Paper Number: SPE-3637-MS
... be considered for publication in one of the two SPE magazines. Abstract A method of restoring or normalizing the spontaneous-potential (SP) curve in thick fractured formations is presented. The Restored SP is then used to delineate the best drilling locations or recompletion candidates. Two case histories...
Proceedings Papers

Paper presented at the SPWLA 50th Annual Logging Symposium, June 21–24, 2009
Paper Number: SPWLA-2009-65257
... Conventional Spontaneous Potential (SP) measurements are usually affected by many factors such as formation thickness, formation resistivity, mud resistivity, and borehole diameter. Because of these factors, the measured SP values could be much less than the Static SP (SSP) values and thus...
Proceedings Papers

Paper presented at the Permian Basin Oil and Gas Recovery Conference, March 13–15, 1986
Paper Number: SPE-15030-MS
... SPE Members Abstract A new method is presented to determine formation water resistivity (R w) in sandstones. This procedure does not use the Spontaneous Potential (SP) log. Instead formation R w is Potential (SP) log. Instead formation R w is obtained from the overlying shale zones...
Journal Articles
OIJ 2019 (10): 38–41.
Paper Number: OIJ-2019-10-038-041-RU
Published: 01 October 2019
...O. B. Kuzmichev; A. V. Zhonin; Yu. V. Martynova; S. A. Kolomasova The PDF file of this paper is in Russian. In layers of limited thickness and high resistance, the amplitude of the spontaneous potential (SP) logs differs significantly from the amplitude corresponding to the layer of unlimited...
Proceedings Papers

Paper presented at the SPWLA 61st Annual Logging Symposium, June 24–July 29, 2020
Paper Number: SPWLA-5006
... that we used are resistivity, spontaneous potential (SP), elements from nuclear spectroscopy, bulk density, neutron, NMR and, of course, Core_Swt to compare to. The plot at the end of the abstract shows our goal: compare core Sw to log derived Sw_surface so that one compares both log and core at the same...
Proceedings Papers

Paper presented at the Formation Evaluation Symposium, October 27–28, 1955
Paper Number: SPE-583-G
... is frequently used. In very rare cases the expanded scale of 120 in. =100 ft can be recorded. THE SPONTANEOlE I'O'lENTIAL CURVE The SP log (spontaneous or self-potential log), is a record of the naturally-occuring po- tentials measured in the mud at different depths in a drill hole. Usually, the SP log consists...
Proceedings Papers

Paper presented at the SPE Rocky Mountain Regional Meeting, May 11–13, 1988
Paper Number: SPE-17516-MS
... Abstract Water resistivity (Rw) values computed from the spontaneous potential (SP) log frequently yield low values for the Minnelusa formation of the Powder River Basin, Wyoming when compared with Rw values determined directly from water samples. These anomalies arise when conventional SP...
Journal Articles
SPE Res Eng 12 (01): 37–44.
Paper Number: SPE-28577-PA
Published: 01 February 1997
... analyses of produced and extracted water, spontaneous-potential (SP) analyses, and resistivity-log calculations. In calculating water saturations with the Archie equation, it was critical that variations in resident water resistivity be recognized. This paper describes the variations observed and the work...
Journal Articles
J Pet Technol 36 (02): 267–275.
Paper Number: SPE-11093-PA
Published: 01 February 1984
... are not considered. Taking the spontaneous potential (SP) log as an example, we see that it measures correct values only in thick beds, and far enough from bed boun- daries. Calculations based on Esp close to bed boun- daries will be incorrect. If the bed is thin enough, we may not be getting correct calculations...
Proceedings Papers

Paper presented at the SPWLA 28th Annual Logging Symposium, June 29–July 2, 1987
Paper Number: SPWLA-1987-SS
... ABSTRACT In the early days of well logging the Spontaneous Potential (SP) log was used extensively by Interpreters to detect the presence of clean permeable zones and to estimate the potential of hydrocarbon prospects. Unfortunately, in today's modern formation evaluation programs, except...
Journal Articles
Petrophysics 36 (05).
Paper Number: SPWLA-1995-v36n5a3
Published: 01 September 1995
...M-Y. Chen; T.M. Habashy; D.R. Mariana; R.J. Schroeder; M.R. Taherian The complex distribution of electrochemical sources in the borehole environment has historically limited the quantitative interpretation of spontaneous potential (SP) logs. In addition, SP models based on characterizations...
Proceedings Papers

Paper presented at the SPE International Symposium on Formation Damage Control, February 23–24, 2000
Paper Number: SPE-58769-MS
... effects. Electrical currents flow around more resistive zones and smooth the shapes of log curves. Thinner zones typically had even more pronounced decreases in responses. Spontaneous potential (SP) curves have been and can still be significantly attenuated in many zones. Furthermore, SP bed boundaries...
Journal Articles
SPE Form Eval 2 (04): 478–486.
Paper Number: SPE-14281-PA
Published: 01 December 1987
.... The saltwater mud used in wells attenuates the spontaneous potential (SP), and thin beds, clay, low permeability. and variable-invasion profiles distort the SP curve, therefore, the SP is not available for water-resistivity determination. The apparent water-resistivity methods and apparent formation-resistivity...
Journal Articles
Petrophysics 36 (06).
Paper Number: SPWLA-1995-v36n6a2
Published: 01 November 1995
... characterization and resource identification. Subsequent to secondary resource identification, conventional EL and IEL suites (typical of mature fields) are used to delineate potentially productive reservoir limits. This involves superposing contour maps of resistivity, relative spontaneous potential (SP), net...

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