Estimating fracture parameters from p-wave velocity profiles about a geothermal well

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Description

The feasibility of locating fracture zones and estimating their crack parameters was examined using an areal well shoot method centered on Utah State Geothermal Well 9-1, Beaver County, Utah. High-resolution travel time measurements were made between a borehole sensor and an array of shot stations distributed radially and azimuthally about the well. Directional velocity behavior in the vicinity of the well was investigated by comparing velocity logs derived from the travel time data. Three fracture zones were identified form the velocity data, corroborating fracture indicators seen in other geophysical logs conducted in Well 9-1. Crack densities and average crack aspect ... continued below

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Pages: 164

Creation Information

Jenkinson, J.T.; Henyey, T.L.; Sammis, C.G.; Leary, P.C. & McRaney, J.K. December 1, 1981.

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Description

The feasibility of locating fracture zones and estimating their crack parameters was examined using an areal well shoot method centered on Utah State Geothermal Well 9-1, Beaver County, Utah. High-resolution travel time measurements were made between a borehole sensor and an array of shot stations distributed radially and azimuthally about the well. Directional velocity behavior in the vicinity of the well was investigated by comparing velocity logs derived from the travel time data. Three fracture zones were identified form the velocity data, corroborating fracture indicators seen in other geophysical logs conducted in Well 9-1. Crack densities and average crack aspect ratios for these fracture zones were estimated using a self-consistent velocity theory (O'Connell and Budiansy 1974). Probable trends of these fracture zones were established from a combination of the data from the more distant shot stations and the results of a gravity survey. The results of this study indicate that the areal well shoot is a potentially powerful tool for the reconnaisance of fracture-controlled fluid and gas reservoirs. Improvements in methodology and hardware could transform it into an operationally viable survey method.

Physical Description

Pages: 164

Notes

NTIS, PC A08/MF A01.

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  • Other Information: Portions of document are illegible

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  • Other: DE82014291
  • Report No.: DOE/ID/12068-T1
  • Grant Number: FC07-79ID12068
  • DOI: 10.2172/5349214 | External Link
  • Office of Scientific & Technical Information Report Number: 5349214
  • Archival Resource Key: ark:/67531/metadc1067314

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  • December 1, 1981

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • March 28, 2018, 1:17 p.m.

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Jenkinson, J.T.; Henyey, T.L.; Sammis, C.G.; Leary, P.C. & McRaney, J.K. Estimating fracture parameters from p-wave velocity profiles about a geothermal well, report, December 1, 1981; United States. (digital.library.unt.edu/ark:/67531/metadc1067314/: accessed November 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.