Abstract
In order to characterize a geothermal reservoir crack, dynamic response of a reservoir crack with fluid leakage along the crack periphery is studied by using a penny-shaped fluid-filled crack in an elastic medium, i.e. a rock mass. Fracture characterization method is derived from dynamic response of the crack. Peak frequencies derived from our crack model are a function of crack radius, aperture, and so on. We characterize reservoir crack by finding a combination of these parameters which minimize the difference between observed peak frequencies in the real field and calculated peak frequencies. Using this characterization method, we could characterize reservoir crack in Higashi-Hachimantai field. Crack radius is around 40 m and aperture is less than 1 mm. These results well accord with those estimated from the field experiments based on different discipline.
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