Radiant energy – Geological testing or irradiation – With sampling
Patent
1988-05-23
1989-07-18
Fields, Carolyn E.
Radiant energy
Geological testing or irradiation
With sampling
250253, G01V 500
Patent
active
048496278
ABSTRACT:
A method for laboratory measurement of lithology factor L related to the photoelectric absorption properties of a rock sample for use in lighology determinations. By definition L=(.sigma..sub.T- .sigma..sub.C)/.sigma..sub.C where .sigma..sub.C is the Compton cross section .sigma..sub.T is the total photoelectric cross section of the sample which includes the binding-energy corrected Compton cross section and the Rayleigh photoelectric cross sections. A low-energy source of gamma radiation sensitive to photoelectric absorption and a high energy source of gamma radiation that has a significantly different sensitivity to photoelectric absorption are employed and the attenuation of radiation from each source is measured. With the low energy source, radiation count rates N.sub.L and N.sub.Lo obtained for measuring attenuated radiation with the sample present and with the sample absent, respectively, and similar count N.sub.H and N.sub.Ho are obtained for the high energy source. Lithology factor L and electron density .rho..sub.e are derived by simultaneously solving a first function of the count rates N.sub.L and N.sub.Lo and a second function of the count rates N.sub.H and N.sub.Ho, wherein each of the functions includes the electron density .rho..sub.e and thickness t of the sample. The high-energy measurements are not necessary if an elemental analysis is performed and measurements of the bulk density and sample thickness are made. Lithology factor L may be transformed into a modified photoelectric factor, P.sub.em by a linear transform chosen such that P.sub.em is identical to the photoelectric factor P.sub.e in pure limestone and sandstone.
REFERENCES:
patent: 3058000 (1962-10-01), Scherbatskoy
patent: 4490609 (1984-12-01), Chevalier
patent: 4628202 (1986-12-01), Minette
Beard William J.
Fields Carolyn E.
Halliburton Logging Services Inc.
LandOfFree
Photoelectric lithology factor and method of measurement does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Photoelectric lithology factor and method of measurement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photoelectric lithology factor and method of measurement will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-174139