Use of surface gravity methods in monitoring subsurface reservoir changes, with case studies at Cerro Prieto, Mexico, and Heber, California
Abstract
Precise gravimetry is useful for monitoring reservoir changes during geothermal production. Temporal gravity changes are due to mass and elevation changes; when leveling accompanies repeated gravity observations, mass and elevation factors are separable, and each can be quantified. Gravity monitoring must be initiated prior to production, since non-geothermal changes are numerous and of large magnitude. Microgal precisions are required, since expected changes are .05-.1 mgal in magnitude, depending on production. State-of-the-art instruments are adequate, but several readings are required. Ongoing studies at Cerro Prieto show no significant changes in two years (confirmed by leveling); similar work has been started at Heber. Precisions range from 8 to 15 microgals for both surveys.
- Authors:
- Publication Date:
- Research Org.:
- California State Univ., Long Beach
- OSTI Identifier:
- 6375178
- Report Number(s):
- CONF-800920-
Journal ID: CODEN: TGRCD
- Resource Type:
- Conference
- Journal Name:
- Trans. - Geotherm. Resour. Counc.; (United States)
- Additional Journal Information:
- Journal Volume: 4; Conference: Geothermal Resource Council annual meeting, Salt Lake City, UT, USA, 9 Sep 1980
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 15 GEOTHERMAL ENERGY; CERRO PRIETO GEOTHERMAL FIELD; GRAVITY SURVEYS; HEBER GEOTHERMAL FIELD; HYDROTHERMAL SYSTEMS; LEVELS; MASS; MONITORING; ENERGY SYSTEMS; GEOPHYSICAL SURVEYS; GEOTHERMAL FIELDS; GEOTHERMAL SYSTEMS; SURVEYS; 150301* - Geothermal Exploration & Exploration Technology- Geophysical Techniques & Surveys
Citation Formats
Grannell, R B. Use of surface gravity methods in monitoring subsurface reservoir changes, with case studies at Cerro Prieto, Mexico, and Heber, California. United States: N. p., 1980.
Web.
Grannell, R B. Use of surface gravity methods in monitoring subsurface reservoir changes, with case studies at Cerro Prieto, Mexico, and Heber, California. United States.
Grannell, R B. 1980.
"Use of surface gravity methods in monitoring subsurface reservoir changes, with case studies at Cerro Prieto, Mexico, and Heber, California". United States.
@article{osti_6375178,
title = {Use of surface gravity methods in monitoring subsurface reservoir changes, with case studies at Cerro Prieto, Mexico, and Heber, California},
author = {Grannell, R B},
abstractNote = {Precise gravimetry is useful for monitoring reservoir changes during geothermal production. Temporal gravity changes are due to mass and elevation changes; when leveling accompanies repeated gravity observations, mass and elevation factors are separable, and each can be quantified. Gravity monitoring must be initiated prior to production, since non-geothermal changes are numerous and of large magnitude. Microgal precisions are required, since expected changes are .05-.1 mgal in magnitude, depending on production. State-of-the-art instruments are adequate, but several readings are required. Ongoing studies at Cerro Prieto show no significant changes in two years (confirmed by leveling); similar work has been started at Heber. Precisions range from 8 to 15 microgals for both surveys.},
doi = {},
url = {https://www.osti.gov/biblio/6375178},
journal = {Trans. - Geotherm. Resour. Counc.; (United States)},
number = ,
volume = 4,
place = {United States},
year = {Mon Sep 01 00:00:00 EDT 1980},
month = {Mon Sep 01 00:00:00 EDT 1980}
}