Neutron absorption measurement of cores

Conference · Sun Feb 01 04:00:00 EST 1987 · AAPG Bulletin (American Association of Petroleum Geologists); (USA)

OSTI ID:5285526

Stufflebeme, G; Tittle, C W; Skopec, R A ^[1]

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1. Gearhart Industries, Inc., Fort Worth, TX (USA)

The first commercial adaptation of a steady-state system for measuring the thermal-neutron-absorption cross section of core samples and liquids uses certain improvements, including smaller (200 cm{sup 3}), and dry as well as water-saturated samples. The core samples can be solid or crushed. The method is fast and accurate. Data on reproducibility and system performance will be presented. Measuring the neutron-absorption cross section can be important for two reasons. The first (and more important) reason is to correct log anomalies. The presence of certain elements such as boron or chlorine, which have large absorption cross sections, can lead to faulty log values. Obtaining a correct measurement for the absorption cross section samples helps determine water saturation from pulsed neutron logs since some uncertainty is removed in its calculation. The presence of elements with large absorption cross section also leads to poor porosity values from compensated neutron logs. The ability to measure the neutron-absorption cross section also helps calibrate the compensated neutron logging tool using samples from the tool's test well. Tool measurements can then be compared with laboratory measurements.

• OSTI ID: 5285526
• Report Number(s): CONF-8703189--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (USA) Journal Volume: 71:2
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
BORON
CHLORINE
CROSS SECTIONS
DRILL CORES
ELEMENTS
EXPLORATION
GEOLOGIC DEPOSITS
HALOGENS
MEASURING METHODS
MINERAL RESOURCES
NEUTRON LOGGING
NEUTRON-GAMMA LOGGING
NONMETALS
PETROLEUM DEPOSITS
RADIOACTIVITY LOGGING
RESOURCES
SEMIMETALS
TRACE AMOUNTS
WELL LOGGING