Continuous borehole self-potential measurement^|^mdash;a new approach to characterize hydrological properties of fractured rock

Nishi, Yuji; Ishido, Tsuneo; Negi, Tateyuki

doi:10.3124/segj.61.285

Cited by 2 publications

(2 citation statements)

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“…Both wells maintain stable pressures of about five bars under shut-in conditions, so that flow tests may be carried out by simply opening and closing the wellhead valves. After preliminary experiments in 2005 and 2006 [25], we installed twelve custom-made silver-silver chloride electrodes in each of the two wells in 2007 [26].…”

Section: Outline Of Measurementsmentioning

confidence: 99%

Characterization of Fractured Reservoirs Using a Combination of Downhole Pressure and Self-Potential Transient Data

Nishi

Ishido

2012

International Journal of Geophysics

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In order to appraise the utility of self-potential (SP) measurements to characterize fractured reservoirs, we carried out continuous SP monitoring using multi Ag-AgCl electrodes installed within two open holes at the Kamaishi Mine, Japan. The observed ratio of SP change to pressure change associated with fluid flow showed different behaviors between intact host rock and fractured rock regions. Characteristic behavior peculiar to fractured reservoirs, which is predicted from numerical simulations of electrokinetic phenomena in MINC (multiple interacting continua) double-porosity media, was observed near the fractures. Semilog plots of the ratio of SP change to pressure change observed in one of the two wells show obvious transition from intermediate time increasing to late time stable trends, which indicate that the time required for pressure equilibration between the fracture and matrix regions is about 800 seconds. Fracture spacing was estimated to be a few meters assuming several micro-darcies (10-18 m2) of the matrix region permeability, which is consistent with geological and hydrological observations.

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Section: Outline Of Measurementsmentioning

confidence: 99%

Characterization of Fractured Reservoirs Using a Combination of Downhole Pressure and Self-Potential Transient Data

Nishi

Ishido

2012

International Journal of Geophysics

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“…At the Kamaishi Mine, Nishi et al 10) carried out pressure and SP measurements in two open holes (KF-1 and KF-3) which are drilled nearly horizontally from the wall of one of the tunnels into the surrounding granodiorite body. Both wells maintain stable pressures of about five bars under shut-in conditions, so that flow tests may be carried out by simply opening and closing the wellhead valves.…”

Section: (3) Observations At the Kamaishi Minementioning

confidence: 99%

Application of Self-potential Measurements to Reservoir Engineering

Ishido¹

2010

The 14th International Symposium on Recent Advances in Exploration Geophysics (RAEG 2010)

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A computational tool so called the "EKP-postprocessor" has been developed to calculate space/time distributions of self-potentials caused by electrokinetic coupling resulting from histories of underground conditions (pressure, temperature, vapor saturation, concentration of dissolved species, etc.) computed by unsteady multi-dimensional geothermal reservoir simulations (Ishido and Pritchett, 1999). This forward calculation technique enables us to incorporate self-potential monitoring data into history-matching studies to improve mathematical reservoir models. In addition to history-matching studies, the EKP-postprocessor can be applied to various problems related to subsurface fluid flow in volcanic areas, sedimentary basins, etc. and characterization of the transport properties of reservoir-forming rocks. In this paper, the results of numerical simulation studies using the EKP-postprocessor to appraise the utility of a combination of pressure and self-potential transient data to characterize fractured reservoirs are presented.

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Continuous borehole self-potential measurement^|^mdash;a new approach to characterize hydrological properties of fractured rock

Cited by 2 publications

References 5 publications

Characterization of Fractured Reservoirs Using a Combination of Downhole Pressure and Self-Potential Transient Data

Characterization of Fractured Reservoirs Using a Combination of Downhole Pressure and Self-Potential Transient Data

Application of Self-potential Measurements to Reservoir Engineering

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