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Keywords: thorium
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Proceedings Papers

Paper presented at the SPWLA 58th Annual Logging Symposium, June 17–21, 2017
Paper Number: SPWLA-2017-U
... involves point-based ternary diagrams and the results are not easily presented in a depth based log. Colour cubing is a technique for turning the portion of the total gamma ray signal that is due to potassium, uranium, and thorium into distinct and meaningful colour patterns. Colour cubing uses the red...
Proceedings Papers

Paper presented at the SPWLA 35th Annual Logging Symposium, June 19–22, 1994
Paper Number: SPWLA-1994-K
... to 2 x 12 have been rtudied md 8re reported here. Another important feature in the uw of the Monte Carlo - Library Lesrt-Squaru (MCLLS) rpprosch which 8llowr the ealculstion (by Monte Culo) of individual library rpectrr for the three natural r8- dioactivitiu @K, urenium, rend thorium. Tti fee ture...
Proceedings Papers

Paper presented at the SPWLA 35th Annual Logging Symposium, June 19–22, 1994
Paper Number: SPWLA-1994-ZZ
... and prolonged subaerial weathering. However, this ironstone is locally characterized by extremely high gamma-ray values caused by high thorium concentrations. The thorium enrichment is additional evidence for the derivation of the iron oolites from bauxitic- laterite weathering products of nearby sourcelands...
Proceedings Papers

Paper presented at the SPWLA 32nd Annual Logging Symposium, June 16–19, 1991
Paper Number: SPWLA-1991-Y
..., and improved log quality control. The new natural gamma ray sonde also incorporates a technique that enables a direct measurement of potassium in the borehole and compensation for heavy mud effects. Artificial Intelligence thorium spwla 32nd correction log analysis detector gamma ray elemental...
Proceedings Papers

Paper presented at the SPWLA 25th Annual Logging Symposium, June 10–13, 1984
Paper Number: SPWLA-1984-W
... displays the thorium and uranium concentrations in ppm, the potassium concentration in percent and the gross gamma count in API units. The pulse height spectra are continuously recorded on magnetic tape during the logging operation and can be played back in post-processing to yield more sophisticated...
Proceedings Papers

Paper presented at the SPWLA 23rd Annual Logging Symposium, July 6–9, 1982
Paper Number: SPWLA-1982-K
... concentrations were observed from 0.4% to 7.2%, while the uranium concentration varied from 0.2 ppm to 45 ppm, and thorium concentration ranged from 0.4 ppm to 11 ppm. Several logs from wells which had core data were examined to compare the responses of commercially available natural gamma ray logging systems...
Proceedings Papers

Paper presented at the SPWLA 23rd Annual Logging Symposium, July 6–9, 1982
Paper Number: SPWLA-1982-G
... thorium quartz detection log analysis potassium feldspar gamma ray heavy mineral interpretation neutron mica mineral Indicator global interpretation porosity Symposium Crossplot ng log kaolinite correction Feldspar SPWLA TWENTY-THIRD ANNUAL LOGGING SYMPOSIUM, JULY 6-9, 1982 ,ma...
Proceedings Papers

Paper presented at the SPWLA 22nd Annual Logging Symposium, June 23–26, 1981
Paper Number: SPWLA-1981-M
... ABSTRACT Calibration techniques are presented for spectral logging of 40K, 214Bi (a decay product of uranium), and 208Tl (a decay product of thorium) using scintillation detectors. Methods of correcting field data for steel casings and water in boreholes are described along with typical...
Proceedings Papers

Paper presented at the SPWLA 21st Annual Logging Symposium, July 8–11, 1980
Paper Number: SPWLA-1980-Q
... ABSTRACT The Natural Gamma Ray Spectrometry Tool (NGS) detects naturally occurring gamma rays of various energies emitted from a formation. Amounts and types of elements present are determined by how the formation was deposited and what has happened to it since deposition. Thorium, uranium...
Proceedings Papers

Paper presented at the SPWLA 21st Annual Logging Symposium, July 8–11, 1980
Paper Number: SPWLA-1980-O
... hypotheses of uranium mineralization there. Raw log data were converted to concentrations of potassium (K), uranium (eU), and thorium (eTh), then the data were block averaged over 25-foot intervals to obtain mean concentrations. Based on the resultant values, slice maps were constructed by contouring...
Proceedings Papers

Paper presented at the SPWLA 20th Annual Logging Symposium, June 3–6, 1979
Paper Number: SPWLA-1979-GG
... in commercial service. The probe contains an intrinsic germanium detector and a 4000 channel multichannel analyzer. Because all data is transmitted digitally over standard logging cable, there is no loss of resolution or signal deterioration in transmission. log analysis disequilibrium problem thorium...
Proceedings Papers

Paper presented at the SPWLA 20th Annual Logging Symposium, June 3–6, 1979
Paper Number: SPWLA-1979-EE
... ABSTRACT Experimentally determined factors are presented that correct spectral gamma-ray logs for the effects of varying borehole fluid and casing attenuation. These corrections are for gamma-ray spectra from the naturally radioactive isotopes of potassium (K), uranium (U), and thorium (Th...
Proceedings Papers

Paper presented at the SPWLA 20th Annual Logging Symposium, June 3–6, 1979
Paper Number: SPWLA-1979-P
... reservoirs to their fullest extent. Several conclusions were drawn about the applications and interpretations that should be applied to this log. log analysis concentration shale Upstream Oil & Gas thorium log analyst gamma ray radioactive element potassium radioactivity Spwla Twentieth...
Proceedings Papers

Paper presented at the SPWLA 20th Annual Logging Symposium, June 3–6, 1979
Paper Number: SPWLA-1979-X
... ABSTRACT This paper describes a system designed to measure the concentrations of potassium, uranium, and thorium in boreholes. The system is divided into a linear pulse processing subsystem that consists of the probe and part of the surface electronics, and a digital recording subsystem. Gamma...
Proceedings Papers

Paper presented at the SPWLA 20th Annual Logging Symposium, June 3–6, 1979
Paper Number: SPWLA-1979-FF
... ABSTRACT The effect of borehole formation parameters on spectral gamma-ray probe response has been calculated from radiation theory. Results are presented for the effect of formation bulk density and composition on the gamma-ray spectra from potassium, uranium, and thorium. Experimentally...
Proceedings Papers

Paper presented at the SPWLA 17th Annual Logging Symposium, June 9–12, 1976
Paper Number: SPWLA-1976-H
... technique, with a [Na 11 - thallium activated detector, for quantitative determination of uranium thorium and potassium in formations encountered in bore holes. The geological applications of this log have been based on laboratory work carri-d out to define the geochemical cycle of the naturally radioactive...
Proceedings Papers

Paper presented at the SPWLA 17th Annual Logging Symposium, June 9–12, 1976
Paper Number: SPWLA-1976-DD
.... Natural gamma rays originate from the radioactive isotope of Potas - sium and the radioactive elements of the Uranium and Thorium series. Each of these three groups of elements (Potassium, Uranium, Thorium) contributes its distinctive spectrum to that of the formation in proportion to its abundance. Thus...
Proceedings Papers

Paper presented at the SPWLA 16th Annual Logging Symposium, June 4–7, 1975
Paper Number: SPWLA-1975-O
... of the three most common sources of natural radioactivity, the uranium and thorium series and potassium-40. This is accomplished through spectral stripping processes and a more sophisticated computer panel. A number of additional logs have been run, several of these being supported with quantitative core...

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