Thermal neutron absorption cross sections for igneous rocks: Newberry Caldera, Oregon

Conference · Mon Jan 01 00:00:00 EST 1990

OSTI ID:6623039

Lysne, P

The thermal neutron absorption cross sections of geologic materials are of first-order importance to the interpretation of pulsed neutron porosity logs and of second-order importance to the interpretation of steady-state porosity logs using dual detectors. Even in the latter case, uncertainties in log response can be excessive whenever formations are encountered that possess absorption properties appreciably greater than the limestones used in most tool calibrations. These effects are of importance to logging operations directed at geothermal applications where formation vary from igneous to sedimentary and which may contain solution-deposited minerals with very large cross-section values. Most measurements of cross-section values for geologic materials have been made for hydrocarbon production applications. Hence, the specimen materials are sedimentary and clean in the sense that they are not altered by geothermal fluids. This investigation was undertaken to measure cross-section values from a sequence of igneous materials obtained from a single hole drilled in an active hydrothermal system. 3 refs., 1 fig.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6623039
• Report Number(s): SAND-90-1696C; CONF-901101-13; ON: DE90013399
• Resource Relation: Conference: American Nuclear Society winter meeting, Washington, DC (USA), 11-15 Nov 1990
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
58 GEOSCIENCES
IGNEOUS ROCKS
CROSS SECTIONS
THERMAL NEUTRONS
ABSORPTION
GEOLOGIC FORMATIONS
GEOTHERMAL FLUIDS
HYDROCARBONS
HYDROTHERMAL SYSTEMS
MEASURING METHODS
POROSITY
SEDIMENTARY BASINS
WELL LOGGING
BARYONS
ELEMENTARY PARTICLES
ENERGY SYSTEMS
FERMIONS
FLUIDS
GEOLOGIC STRUCTURES
GEOTHERMAL SYSTEMS
HADRONS
NEUTRONS
NUCLEONS
ORGANIC COMPOUNDS
ROCKS
Geothermal Legacy
150303* - Geothermal Exploration & Exploration Technology- Exploratory Drilling & Well Logging
152002 - Geothermal Data & Theory- Properties of Minerals & Rocks
580000 - Geosciences