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Keywords: capture cross section
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Proceedings Papers
Paper presented at the SPWLA 58th Annual Logging Symposium, June 17–21, 2017
Paper Number: SPWLA-2017-IIII
... will be illustrated with changes in apparent porosity that are determined using different assumptions. With this information, an analyst will have a better understanding of how to implement temperature and pressure corrections more successfully. log analysis capture cross section borehole Symposium spwla...
Proceedings Papers
Paper presented at the SPWLA 58th Annual Logging Symposium, June 17–21, 2017
Paper Number: SPWLA-2017-UUUU
... and it contains a D-T neutron source, four gamma detectors arranged in a ring with 90 degree between two of them and a He-3 detector whose spacing is further than gamma detectors spacing. In addition, a new kind of proppant which contains Gd 2 O 3 with extremely high thermal neutron capture cross section...
Proceedings Papers
Paper presented at the SPWLA 57th Annual Logging Symposium, June 25–29, 2016
Paper Number: SPWLA-2016-J
... and resistivity) and few modern logs by comparing measured pulsed neutron capture cross section (sigma) logs to calibrated forward-modeled sigma log response curves for a rock system containing sand and shale, and porosity containing oil, gas, or water. Key for the modeling was a good representation of the shale...
Proceedings Papers
Paper presented at the SPWLA 52nd Annual Logging Symposium, May 14–18, 2011
Paper Number: SPWLA-2011-YYY
... fluid, and formation. The capture events produce gamma rays that are detected by the tool and placed into a time spectrum, i.e., gamma ray counting rate as a function of elapsed time. From the information contained in the time spectrum, we are able to determine the thermal neutron capture cross section...
Proceedings Papers
Paper presented at the SPWLA 51st Annual Logging Symposium, June 19–23, 2010
Paper Number: SPWLA-2010-47349
... machine learning well logging log analysis detector Upstream Oil & Gas variation Simulation CPU time spwla 51 Artificial Intelligence capture cross section thinly-bedded formation Symposium PNC log neutron synthetic case pnc measurement boundary saturation borehole FSF...
Proceedings Papers
Paper presented at the SPWLA 48th Annual Logging Symposium, June 3–6, 2007
Paper Number: SPWLA-2007-N
... a volumetric response model in the fracture stimulated reservoir. The anomalies observed in the formation capture cross section (sigma) can be a large calculated change in the reservoir saturation, making use of the logs difficult. An explanation could lie in the substantial volume fraction of proppants just...
Proceedings Papers
Paper presented at the SPWLA 45th Annual Logging Symposium, June 6–9, 2004
Paper Number: SPWLA-2004-H
..., such as the macroscopic capture cross section Sigma of the rock matrix. A significant limitation of the open hole/cased hole neutron overlay method is accounting for temperature variation over time. Ultimately, the accuracy of calculated steam saturations directly impacts the accuracy of remaining/residual oil estimates...
Proceedings Papers
Paper presented at the SPWLA 45th Annual Logging Symposium, June 6–9, 2004
Paper Number: SPWLA-2004-F
... displacement. Examples showing what actually happened after fifteen years compared to what was predicted ten years ago with only five years of monitoring are covered. An approach for continued monitoring for the next five to ten years is also presented capture cross section Monitoring Project fluid...
Proceedings Papers
Paper presented at the SPWLA 40th Annual Logging Symposium, May 30–June 3, 1999
Paper Number: SPWLA-1999-M
... ABSTRACT Pulsed neutron capture (PNC) logs have been in routine use for decades for the measurement of formation capture cross section. The measurement is robust, accurate, and statistically precise. However, borehole and diffusion effects on the measurement are difficult to characterize...
Proceedings Papers
Paper presented at the SPWLA 39th Annual Logging Symposium, May 26–28, 1998
Paper Number: SPWLA-1998-JJJ
... of functional relationship between count rates and gas saturation. Several cross plots for the same range of porosity and connate water saturation, e.g. formation capture cross section (SIGM), total selected near detector counts (TSCN), total selected far detector counts (TSCF), the capture cross section...
Proceedings Papers
Paper presented at the SPWLA 38th Annual Logging Symposium, June 15–18, 1997
Paper Number: SPWLA-1997-L
... ABSTRACT Pulsed neutron capture technology is a well-established methodology in the oil and gas industry. Measurement of formation capture cross section (sigma) has been used for decades in the estimation of fluid saturation, primarily in cased hole environments. The stand-alone applications...
Proceedings Papers
Paper presented at the SPWLA 37th Annual Logging Symposium, June 16–19, 1996
Paper Number: SPWLA-1996-OO
... methods which are currently available for measuring SOR. log analysis lil technique input parameter Upstream Oil & Gas accuracy BHGM evaluation well logging Brine porosity Symposium reservoir capture cross section Sorw oil saturation saturation Standard Deviation determination...
Proceedings Papers
Paper presented at the SPWLA 36th Annual Logging Symposium, June 26–29, 1995
Paper Number: SPWLA-1995-A
... in a borehole-casing-formation environment. This yields a predicted y-count rate at the detec- tor which can be compared with the count rate ac- tually recorded. Via this approach it is possible to extract the thermal neutron capture cross section of the formation. In order to validate our model we show...
Proceedings Papers
Paper presented at the SPWLA 35th Annual Logging Symposium, June 19–22, 1994
Paper Number: SPWLA-1994-M
... of this tool is generally similar to the earlier TMD tool. Extensive characterization in laboratory formations confirms this observation. detector lithology indicator Symposium well logging capture cross section Symposium Transaction log analysis decay curve borehole characterization Jacobson...
Proceedings Papers
Paper presented at the SPWLA 34th Annual Logging Symposium, June 13–16, 1993
Paper Number: SPWLA-1993-DDD
... to the intrinsic capture cross section of the formation matrix. Equal amounts of thermal neutron absorbers affect the dolomite response more than the limestone response, despite the similarity in the response of the two formations with no absorbers. Formation salinity effect is also related to the matrix capture...
Proceedings Papers
Paper presented at the SPWLA 31st Annual Logging Symposium, June 24–27, 1990
Paper Number: SPWLA-1990-E
... and into the bore- hole and formation. This effect produces a markedly different neutron distribution than that of a typical wireline neutron porosity tool. The iron in the collar also has a relatively large thermal neutron capture cross section and radiates multiple gamma rays per capture, resulting in high...
Proceedings Papers
Paper presented at the SPWLA 31st Annual Logging Symposium, June 24–27, 1990
Paper Number: SPWLA-1990-OO
... Symposium. June 2627.1990 00 thermal neutron capture cross section from the elemental cross sections. Typical C, values based only on measurable elements were 8.0 to 8.3 cu. If all the elements reported below detection limit were assumed present at detection limit, Ema would typically be 8.6 to 8.9 cu...
Proceedings Papers
Paper presented at the SPWLA 31st Annual Logging Symposium, June 24–27, 1990
Paper Number: SPWLA-1990-Q
... corrections, a pulsed neutron capture (PNC) lifetime measure- ment provides, at best, a good approximation to intrinsic thermal neutron capture cross section (Ci,t). Our industry has recognized for years that Clog values are affected by environmental factors other than Ch,. Although logging system designers...
Proceedings Papers
Paper presented at the SPWLA 29th Annual Logging Symposium, June 5–8, 1988
Paper Number: SPWLA-1988-TT
... are also included. The monitoring of water movement has been attempted by the use of repeat cased-hole pulsed-neutron logs. The capture cross section of Prudhoe Bay formation oil and water provides limited dynamic range in measured sigma from oil and water bearing sands. This limited environment for pulsed...
Proceedings Papers
Paper presented at the SPWLA 28th Annual Logging Symposium, June 29–July 2, 1987
Paper Number: SPWLA-1987-U
... of the method is that the measured cross section is the intrinsic formation capture cross section, and its value is independent of the borehole fluid. Analysis of the decay curve by this method makes the result independent of tool design features such as neutron burst width, counting gate widths and counting...
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