Title:

The Self-Potential Response During Hydraulic Fracturing of Sierra Granite

Authors:

Jeffrey R. Moore, Steven D. Glaser

Key Words:

self potential, hydraulic fracturing

Conference:

Stanford Geothermal Workshop

Year:

2006

Session:

Geophysics

Language:

English

Paper Number:

Moore

File Size:

112KB

View File:

Abstract:

The self-potential (SP) response during hydraulic fracturing of intact Sierra granite specimens was investigated in the laboratory. Excellent correlation of injection pressure and SP suggests that the SP response is created primarily by electrokinetic coupling. For low injection pressures the variation of SP and pressure drop is linear indicating a constant coupling coefficient (Cc). However, for injection pressures >2MPa the Cc increases with pressure by nearly 80% in an exponential trend. The increasing Cc is likely related to increasing permeability at high pore pressures due to dilatancy of micro-cracks.


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