Information-measuring system for investigating by pulsed neutron probing
The structure and operating principle of a system for determining the limits of oil-bearing strata by the pulsed neutron-gamma and oxygen activation logging method are considered. A system for automatically stabilizing the yield of a neutron generator is analyzed. An algorithm for estimating the damping decrement of a flux of thermal neutrons in the region of the borehole space is given. The probing of objects by radioactive radiation is widely used in scientific experiments and in industry, particularly. in borehole geophysics, where there is no direct access to the medium being investigated, e.g., oil and gas bearing strata. For exploring and monitoring oil-bearing deposits pulsed neutron probing using low-frequency (10-400 Hz) pulsed neutron emitters employing the D-T reaction with a yield of fast (14 MeV) neutrons and a flux intensity of (10{sup 8} sec{sup {minus}1})is extremely promising. In hydrogen-containing strata, because of elastic interaction between the neutrons and the hydrogen nuclei. the neutrons are rapidly slowed down to thermal energies. This enables the reaction of radiation capture of thermal neutrons and the activation of oxygen nuclei by fast neutrons to be used to determine the limits of oil-bearing levels.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 244199
- Journal Information:
- Measurement Techniques, Journal Name: Measurement Techniques Journal Issue: 3 Vol. 38; ISSN 0543-1972; ISSN MSTCAL
- Country of Publication:
- United States
- Language:
- English
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