Method of determining the water-petroleum interface from the $sup 13$C($gamma$,n)$sup 12$C reaction with the use of a 6 to 8 MeV electron beam

Journal Article · Fri Jun 01 04:00:00 EDT 1973 · At. Energ. (USSR), v. 34, no. 6, pp. 485-487

OSTI ID:4388972

Dorosh, M M; Parlag, A M; Shkoda-Ul'yanov, V A; Danilich, I I; Mazur, V M; Ugrin, A Yu

Oil-bearing strata differ from water-bearing strata in /sup 13/C content. The deuterium content in oil strata exceeds by 50% or more the deuterium content in water strata. Hence a larger yield of photoneutrons is expected from an oil- bearing stratum, especially since the yield of photoneutrons from the /sup 17/O( gamma ,n)/sup 16/O reaction tur ns out to be insignificant. In order to model an encased borehole, measurements were taken on the following mixtures: 70% SiO/sub 2/ + 30% H/sub 2/O (water-bearing stratum) and 70% SiO/sub 2/ + 30% oil (oilbearing stratum), and also on pure water and oil (ratio of compo- nents are given in vol%). The mixtures were placed in a metal tank 42 x 42 x 42 cm. The bremsstrahlung radiation struck the tank from a side covered with 3 cm concrete (2.4 g/cm/sup 3/ density) and an iron sheet 8 mm thick to imitate the steel tube and cement collar. The photoneutrons were registered on a BF/sub 3/ counter which was in the field of scattering of the 6.5 to 8.6 MeV gamma radiation at a distance of 20 cm from the beam axis. With 8.1 MeV gamma rays the neutron yield from the oil-bearing layer exceeded the neutron yield from the water-bearing layer by ~50% for an uncased borehole, and by ~30% for a simulated cased borehole. (SJR)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-29-005135
• OSTI ID: 4388972
• Journal Information: At. Energ. (USSR), v. 34, no. 6, pp. 485-487, Journal Name: At. Energ. (USSR), v. 34, no. 6, pp. 485-487; ISSN AENGA
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

*PETROLEUM-- PROSPECTING
*WELL LOGGING-- PHOTONUCLEAR REACTIONS
CARBON 13
ELECTRON BEAMS
N44420* --Environmental & Earth Sciences--Radiometric Techniques--Soil
PROMPT NEUTRONS
WATER