SP Monitoring during the hydraulic fracturing using the TG-2 well

Kawakami, Noriaki; Takasugi, Shinji

doi:10.3997/2214-4609.201409783

Cited by 11 publications

(10 citation statements)

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“…Grinat et al [2004] monitored the surface SP response during field stimulations at a depth of 3790 m but observed no correlation between the SP anomalies and injection events. Finally, Kawakami and Takasugi [1994] and Marquis et al [2002] reported surface SP data during hydraulic stimulation of deep hot dry rock geothermal reservoirs, demonstrating good correlation between the temporal SP variation and injection pressure and flow rate. Surface anomalies up to 40 mV correlated to both injection and flow‐back events.…”

Section: Introductionmentioning

confidence: 84%

“…Surface anomalies up to 40 mV correlated to both injection and flow‐back events. Kawakami and Takasugi [1994] also reported the spatial surface SP variation but did not mention the orientation of the induced fracture or whether a correlation to fracture geometry was evident. We have undertaken a research program to monitor the spatial and temporal SP response during hydraulic fracturing in the laboratory and to investigate the origins of these signals.…”

Section: Introductionmentioning

confidence: 99%

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Self‐potential observations during hydraulic fracturing

Moore¹,

Glaser²

2007

J. Geophys. Res.

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[1] The self-potential (SP) response during hydraulic fracturing of intact Sierra granite was investigated in the laboratory. Excellent correlation of pressure drop and SP suggests that the SP response is created primarily by electrokinetic coupling. For low pressures, the variation of SP with pressure drop is linear, indicating a constant coupling coefficient (Cc) of À200 mV/MPa. However, for pressure drops >2 MPa, the magnitude of the Cc increases by 80% in an exponential trend. This increasing Cc is related to increasing permeability at high pore pressures caused by dilatancy of microcracks and is explained by a decrease in the hydraulic tortuosity. Resistivity measurements reveal a decrease of 2% prior to hydraulic fracturing and a decrease of $35% after fracturing. An asymmetric spatial SP response created by injectate diffusion into dilatant zones is observed prior to hydraulic fracturing, and in most cases this SP variation revealed the impending crack geometry seconds before failure. At rupture, injectate rushes into the new fracture area where the zeta potential is different than in the rock porosity, and an anomalous SP spike is observed. After fracturing, the spatial SP distribution reveals the direction of fracture propagation. Finally, during tensile cracking in a point load device with no water flow, a SP spike is observed that is caused by contact electrification. However, the time constant of this event is much less than that for transients observed during hydraulic fracturing, suggesting that SP created solely from material fracture does not contribute to the SP response during hydraulic fracturing.

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Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Self‐potential observations during hydraulic fracturing

Moore¹,

Glaser²

2007

J. Geophys. Res.

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“…The recorded signals are composed by in situ signals and telluric currents, which correspond to the main source of noise in addition to cultural activity (50 Hz and harmonics). For monitoring purposes, the removal of cultural noise and telluric currents can be accomplished by filtering the SP measurements using the magnetic variations recorded with a magnetometer and a reference station for the self-potential survey (Kawakami and Takasugi, 1994).…”

Section: Further Improvements In Estimating the Water Table With Selfmentioning

confidence: 99%

Estimation of the water table throughout a catchment using self-potential and piezometric data in a Bayesian framework

Linde

Revil

Bolève

et al. 2007

Journal of Hydrology

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“…Corrections can be accomplished, for example, by filtering the self‐potential measurements with specific filters based on the magnetic variations recorded with a magnetometer and a reference station for the self‐potential survey. Kawakami and Takasugi [1994] have shown that such a procedure reduced the noise due to telluric currents from 30 mV to 3 mV.…”

Section: Sensitivity Of Electrographymentioning

confidence: 99%

Principles of electrography applied to self‐potential electrokinetic sources and hydrogeological applications

Revil

Naudet

Nouzaret

et al. 2003

Water Resources Research

171

160

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[1] The electrical potential field passively recorded at the ground surface of the Earth (and termed self-potential) can be analyzed to determine the shape and the depth of the piezometric surface. The coupling between hydraulic flow and electrical current density is electrokinetic in nature. The electrokinetic coupling coefficient entering into the integral equation relating the depth of the water table to self-potential signals is analyzed for various types of porous materials. It is simply related to the electrical conductivity of the pore water. In steady state conditions each element of the water table can be seen as an elementary dipole with an inclination locally perpendicular to the water table and strength proportional to the water table elevation. Then, we propose three methods to obtain the shape and range of possible depths of the water table from the study of the selfpotential distribution recorded at the ground surface. The nonuniqueness of the solution is removed if one knows either the electrokinetic coupling coefficient or the water table at one location and under the assumption of the spatial homogeneity of the electrokinetic coupling coefficient. Two field cases are discussed to show the success of the proposed methods for estimating the shape and depth of the water table at two different scales of investigations. They concern the study of self-potential signals associated with the shape of the water table in the vicinity of a pumping well and in the flank of the Kilauea volcano.INDEX TERMS: 1832 Hydrology: Groundwater transport; 5109 Physical Properties of Rocks: Magnetic and electrical properties; 5139 Physical Properties of Rocks: Transport properties; 5114 Physical Properties of Rocks: Permeability and porosity; KEYWORDS: self-potential, hydraulic charge, water table, electrokinetic, streaming potential, tomography Citation: Revil, A., V. Naudet, J. Nouzaret, and M. Pessel, Principles of electrography applied to self-potential electrokinetic sources and hydrogeological applications, Water Resour.

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SP Monitoring during the hydraulic fracturing using the TG-2 well

Cited by 11 publications

References 0 publications

Self‐potential observations during hydraulic fracturing

Self‐potential observations during hydraulic fracturing

Estimation of the water table throughout a catchment using self-potential and piezometric data in a Bayesian framework

Principles of electrography applied to self‐potential electrokinetic sources and hydrogeological applications

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