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Focused gamma ray density logging

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Proceedings Papers

Paper presented at the SPWLA 59th Annual Logging Symposium, June 2–6, 2018
Paper Number: SPWLA-2018-G
... ABSTRACT Formation bulk density is classically measured by irradiating the formation with gamma rays emitted by a 137 Cs source, and counting the Compton scattered photons returning to the gamma ray detectors in the well logging instrument. For at least three decades, service companies...
Journal Articles
Petrophysics 59 (05): 565–587.
Paper Number: SPWLA-2018-v59n5a1
Published: 01 October 2018
... 9Schlumberger, 1325 S. Dairy Ashford Rd., Houston, TX 77077 USA; rstewart5@slb.com ABSTRACT Formation bulk density is classically measured by irradiating the formation with gamma rays emitted by a 137Cs source, and counting the Compton scattered photons returning to the gamma-ray detectors in the well-logging...
Journal Articles
Petrophysics 54 (02): 91–103.
Paper Number: SPWLA-2013-v54n2-A2
Published: 01 April 2013
..., and deployment procedures. The well logging industry has been seeking an alternative to the radioisotope-based technology for years; some of these alternatives have focused on finding a way to "make do" without a density measurement. However, the industry standard technique of comparing neutron and density...
Proceedings Papers

Paper presented at the SPWLA 53rd Annual Logging Symposium, June 16–20, 2012
Paper Number: SPWLA-2012-082
... was prepared for presentation at the SPWLA 53rd Annual Logging Symposium held in Cartagena, Colombia, June 16-20, 2012. ABSTRACT Bulk density is among the most critical formation parameters for geoscientists. Traditional acquisition technology employs a radioisotope ( 137 Cs) as a source of gamma rays...
Journal Articles
J Pet Technol 37 (06): 1035–1040.
Paper Number: SPE-12477-PA
Published: 01 June 1985
... and the surrounding area and is focused upward toward the detector. Fig. 2 shows a schematic of the tool configuration. Some of the gamma rays are scattered back to the detector. The number of gamma rays returning to the detector is an indication of the density of the material through which they traveled. High...
Journal Articles
Petrophysics 52 (05): 357–368.
Paper Number: SPWLA-2011-v52n5a3
Published: 01 October 2011
... presents serious challenges because of its unique properties, including high gamma ray radioactivity, low hydrogen index, high density, and high thermal neutron cross section. Efforts have been made by service providers to characterize their logging tools and to compensate for the effects of potassium...
Proceedings Papers

Paper presented at the SPWLA 28th Annual Logging Symposium, June 29–July 2, 1987
Paper Number: SPWLA-1987-A
... ABSTRACT A new MWD gamma ray tool using high density material to focus detection of radioactivity in both the upper and lower sections of the borehole has been developed. In addition to formation correlation capability, the focusing characteristic of the gamma detector allows detection...
Journal Articles
Petrophysics 30 (05).
Paper Number: SPWLA-1989-v30n5a1
Published: 01 September 1989
...D.A. Christoffel; J.R. Kayal Density, gamma-ray, neutron, sonic, caliper, resistance, self-potential, and focused-resistivity logging were carried out for lignite coal evaluation in the Southland lignite region. The most useful logs for identification and location of the coalseams were density...
Proceedings Papers

Paper presented at the SPE Unconventional Gas Technology Symposium, May 18–21, 1986
Paper Number: SPE-15208-MS
... analysis is performed on approximately fifty plugs. Logging services include dual induction spherically focused, long spaced sonic , litho- density, compensated neutron, electromagnetic propagation, micro-log, natural gamma ray spectroscopy, induced gamma ray spectroscopy, and stratigraphic high resolution...
Proceedings Papers

Paper presented at the SPWLA 51st Annual Logging Symposium, June 19–23, 2010
Paper Number: SPWLA-2010-99345
... encounters serious challenges because of its unique mud properties, including high gamma ray radioactivity, low hydrogen index, high density, and high thermal neutron cross section. Efforts have been made by logging service providers to characterize their tools and to compensate for the effects of potassium...
Proceedings Papers

Paper presented at the SPE/AAPG/SEG Unconventional Resources Technology Conference, August 1–3, 2016
Paper Number: URTEC-2431773-MS
... logging, the Marcellus in this part of PA is composed of three distinct lithofacies (Basal, Middle and Upper zones), easily recognized by their petrophysical rock properties such as Spectral Gamma Ray response (Uranium content), TOC, bulk density, porosity and gas saturation. Logging was conducted...
Proceedings Papers

Paper presented at the Offshore South East Asia Show, February 9–12, 1982
Paper Number: SPE-10464-MS
... Identification Log (FIL) an even the strike of the fracture system could be estimated. – The Gamma Ray or the Natural Gamma Ray Spectroscopy tool could show abnormal high radioactivity levels explained by deposition of Uranium salts in the fractures. – The Pe Curve of the Lithodensity tool can...
Journal Articles
Petrophysics 54 (02): 113–127.
Paper Number: SPWLA-2013-v54n2-A4
Published: 01 April 2013
... ability to address these challenges. This paper focuses on the challenges and solutions to providing meaningful gamma-gamma density logs. Formate muds affect density logs in three ways. First, potassium in the mud generates gamma rays that increase count rates, but that effect is small. Second, gamma...
Proceedings Papers

Paper presented at the SPE Unconventional Gas Conference, February 23–25, 2010
Paper Number: SPE-131767-MS
... of predicting the volume of low density high gamma ray organic material (kerogen) as a guide to understanding the deposition of the shales. Subsequently, work focused on not only calculating the density of upper Devonian shales, but applying a correction to the density and neutron logs to correct them...
Proceedings Papers

Paper presented at the SPWLA 53rd Annual Logging Symposium, June 16–20, 2012
Paper Number: SPWLA-2012-119
... these challenges. This paper focuses on the challenges and solutions to providing meaningful gamma-gamma density logs. Formate muds affect density logs in three ways. First, potassium in the mud generates gamma rays that increase count rates, but that effect is small. Second, gamma-scattering and gamma-absorption...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, September 21–24, 1980
Paper Number: SPE-9467-MS
... density. The natural gamma system uses a large crystal to gain needed statistical quality from the gamma ray flux found in coal operations. The single arm caliper decentralizes the tool for the benefit of the density system and produces a continuous linear measurement of hole size. Hole conditions shown...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, September 24–26, 2018
Paper Number: SPE-191674-MS
... pore space, rock matrix, and organic matters in this formation, and create 3D pore network models from core samples; and (c) to identify the geological and engineering sweet-spot along vertical wellbore. For well log interpretation, we obtained Gamma Ray (GR), spectral GR, neutron, density...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, March 26–28, 2013
Paper Number: IPTC-16926-Abstract
... reservoir thickness. In emerging play areas, legacy wireline logging measurements such as Resistivity, Gamma Ray, Density, and Sonic are often the primary source of rock property information. Core measurements are limited or not available, and quality information on TOC and mineralogy may be sparse...
Proceedings Papers

Paper presented at the 8th World Petroleum Congress, June 13–18, 1971
Paper Number: WPC-14237
... the last World Petroleum Congress several combination tools were developed to record more quickly the logs required for modern interpretation techniques. Combinations include: induction-spherically focused resistivity-acoustic-SP-gamma ray logs, and neutron-density-gamma ray-caliper logs. Other new tools...
Proceedings Papers

Paper presented at the SPE Russian Oil and Gas Exploration and Production Technical Conference and Exhibition, October 16–18, 2012
Paper Number: SPE-162114-MS
... and neutron-gamma density recorded using a PNG without a chemical radioactive source. well logging upstream oil & gas sngd measurement resolution positive comparison log analysis detector radioisotope-free formation evaluation shale operation gamma ray neutron porosity quality indicator...

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