Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1998-03-06
2000-11-21
Hannaher, Constantine
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
2502697, G01V 512
Patent
active
061506559
ABSTRACT:
A method for inferring the photoelectric absorption of a formation by directly mapping spectroscopic measurements of gamma rays induced in the formation using a fast neutron source. The mapping is accomplished by creating a polynomial function based on counts of gamma-ray events in the gamma-ray energy spectrum; the coefficients of the polynomial function are determined in known calibration environments, and the value of the polynomial is the inferred photoelectric absorption parameter. The spectroscopic measurements are preferably generated by sorting gamma-ray counts of the gamma-ray spectrum into a plurality of energy-dependent channels, and measuring these gamma-ray energy distributions during different portions of the firing cycle where different types of dominant gamma-ray production reactions occur.
REFERENCES:
patent: 4048495 (1977-09-01), Ellis
patent: 4055763 (1977-10-01), Antkiw
patent: 4297575 (1981-10-01), Smith, Jr. et al.
patent: 4628202 (1986-12-01), Minette
patent: 4810876 (1989-03-01), Wraight et al.
patent: 5900627 (1999-05-01), Odom et al.
L.A. Jaconson, R. Ethridge, and D.F. Wyatt, Jr., "A New thermal Multigate Decay-Lithology Tool," SPWLA 35th Annual Logging Symposium, Jun. 19-22, 1994.
Jeffrey L. Baldwin, Richard M. Bateman, Charles L. Wheatley, "Application of a Neural Network to the Problem of Mineral Identification from Well Logs," The Log Analyst, Sep.-Oct.,1990.
Darwin V. Ellis, "Well Logging for Earth Scientists", Elsevier Science Pub., 1987.
D.C. McCall and J.S. Gardner, "Litho-Density Log Applications in the Michigan and Illinois Basins," SPWLA Twenty-Third Annual Logging Symposium, Jul. 6-9, 1982.
J.H.Fang, C.L. Karr, D.A. Stanley, "Transformation of Geochemical Log Data to Minerology Using Genetic Algorithms," The Log Analyst, Mar.-Apr. 1996.
L.A. Jocobson and D.F. Wyatt, "Elemental Yields and Complex Lithology Analysis from the Pulsed Spectral Gamma Log," The Log Analyst, Jan.-Feb., 1996.
http://www.recsys.com
eural2.htm, "Neural Computing-Inside the Black Box," Oct. 1997, Recognition Systems, Inc.
Bailey Shawn Marie
Odom Richard Charles
Computalog Research, Inc.
Hannaher Constantine
Israel Andrew
LandOfFree
Inferential measurement of photoelectric absorption cross-sectio does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Inferential measurement of photoelectric absorption cross-sectio, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Inferential measurement of photoelectric absorption cross-sectio will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1259655