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UP: Umweltphysik

UP 7: Hydrosph
äre und Boden I

UP 7.6: Fachvortrag

Montag, 22. März 2004, 15:30–15:45, HS 020

Observation, Modelling and Use of Short Term Signals in Pump Induced Near Surface Tilt — •Marcus Fabian¹ and Hans-Joachim Kümpel² — ¹Fachrichtung Angewandte Geophysik, Universität Bonn, Nussallee 8, 53115 Bonn — ²GGA Institut, Stilleweg 2, 30665 Hannover

Subsidence is frequently reported from locations above pumped reservoirs. Tiltmeters installed at shallow depths are able to detect the related tilt signals. We present observations of short term tilt and well head responses that showed non-monotonous transient signals induced by monotonous pumping. Modelling on the basis of poroelasticity has revealed that the transient signals can be used for a fast determination of subsoil parameters. Especially near surface tilt is sensitive to changes of the poroelastic parameters in deeper layers. Therefore, tilt monitoring above pumped reservoirs appears to be useful for controlling the reservoir quality and prevent overexploitation. With clusters of tiltmeters installed at shallow depths the pump induced surface deformation field spreading out in the surroundings of production wells can be imaged. Such observations allow a localization of buried heterogeneities and might be used to reduce ambiguities from hydrologic, seismic or electric surveying.