Preliminary results for a near surface 3-D seismic survey of a geothermal system in Colorado

Andrew P. Lamb, Kasper Van Wijk, Lee Liberty, Andre Revil, Kyle Richards, Michael Batzle

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

As part of an effort to understand a complicated shallow low-temperature geothermal system in the Arkansas Valley, Colorado, we focused on Chalk Cliff Valley by acquiring a 3-D seismic data with a 240 m2 footprint. In order to optimize a reflection image of the site, we use refraction and wavefield modeling in an initial attempt to interpret the shot gathers. Our results show the bedrock dipping to the south by up to 31, up to 110 m deep at the southern extent of the site. We also find a water table depth of 10 m and present evidence that the saturated sediments are terminating near the northern end of the site where the bedrock is shallowing. We also find that the velocity field may be anisotropic with the refraction model results estimating a 12 percent increase in the N-S direction. Our findings, and particularly the fractured bedrock and a termination of the saturated sediments on the northern end of our study area are consistent with geologic observations and Self-Potential data identifying a localized anomaly associated with up-welling (hot) water. The velocity model will guide reflection imaging to be performed shortly.

Original languageEnglish
Title of host publicationSociety of Exploration Geophysicists International Exposition and 80th Annual Meeting 2010, SEG 2010
PublisherSociety of Exploration Geophysicists
Pages1965-1969
Number of pages5
ISBN (Print)9781617389801
DOIs
StatePublished - 2010
EventSociety of Exploration Geophysicists International Exposition and 80th Annual Meeting 2010, SEG 2010 - Denver, United States
Duration: 17 Oct 201022 Oct 2010

Publication series

NameSociety of Exploration Geophysicists International Exposition and 80th Annual Meeting 2010, SEG 2010

Conference

ConferenceSociety of Exploration Geophysicists International Exposition and 80th Annual Meeting 2010, SEG 2010
Country/TerritoryUnited States
CityDenver
Period17/10/1022/10/10

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