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New neutron log for small scale variations in carbon/oxygen ratio

Valković, Vladivoj; Sudac, Davorin; Nađ, Karlo; Obhođaš, Jasmina (2015) New neutron log for small scale variations in carbon/oxygen ratio. IEEE Transaction on Nuclear Science, 62 (2). pp. 407-414. ISSN 0018-9499

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The aim of the research reported here is the development of a methodology for the measurement of small scale variations in chemical elements concentrations, in particular of carbon to oxygen ratio. Knowledge of the C/O ratio is of importance to many problems in various fields. Here we single out the application in obtaining important information about the oilfields. The most fundamental reservoir parameters-oil, gas and water content-are critical factors in determining how each oilfield should be developed. It is well established that carbon to oxygen ratio log yields accurate and repeatable data that can be used to identify and monitor reserves depletion. Recent improvements in neutron generator and gamma detector technologies resulted in small devices which allowed through-tubing measurements. Although the ratio of carbon and oxygen yields is a measure of the amount of oil around the tool it should be realized that a carbon signal can originate from several sources including the borehole, the cement behind the casing, the formation rock and the formation fluid. In order to evaluate these contributions individually we are proposing the modification of the neutron generator by insertion of segmented associated alpha particle detector. From the measurement of neutron time of flight spectra (alpha particle detector-start signal ; gamma ray detector-stop signal) it would be possible to determine the location of gamma-ray production voxel and in such a way to determine radial variations in chemical elements concentrations, in particular of C/O ratio.

Item Type: Article
Additional Information: © © 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Uncontrolled Keywords: carbon; carbon/oxygen ratio; gamma ray spectra; neutrons; oil fields; oxygen; small scale variations
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Experimental Physics
Project titleProject leaderProject codeProject type
Razvoj i primjene nuklearnih analitičkih metoda-Jasmina Obhođaš098-0362975-2881MZOS
Depositing User: Kristina Ciglar
Date Deposited: 03 Nov 2016 12:21
DOI: 10.1109/TNS.2015.2390671

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