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Article Dans Une Revue Water Année : 2020

Contribution of Full Wave Acoustic Logging to the Detection and Prediction of Karstic Bodies

Résumé

A 3D seismic survey was done on a near surface karstic reservoir located at the hydrogeological experimental site (HES) of the University of Poitiers (France). The processing of the 3D data led to obtaining a 3D velocity block in depth. The velocity block was converted in pseudo porosity. The resulting 3D seismic pseudo-porosity block reveals three high-porosity, presumably-water-productive layers, at depths of 30-40, 85-87 and 110-115 m. This paper shows how full wave acoustic logging (FWAL) can be used to validate the results obtained from the 3D seismic survey if the karstic body has a lateral extension over several seismic. If karstic bodies have a small extension, FWAL in open hole can be fruitfully used to: detect highly permeable bodies, thanks to measurements of acoustic energy and attenuation; detect the presence of karstic bodies characterized by a very strong attenuation of the different wave trains and a loss of continuity of acoustic sections; confirm the results obtained by vertical seismic profile (VSP) data. The field example also shows that acoustic attenuation of the total wavefield as well as conversion of downward-going P-wave in Stoneley waves observed on VSP data are strongly correlated with the presence of flow.
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Dates et versions

hal-02883337 , version 1 (29-06-2020)

Identifiants

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Jean-Luc Mari, Gilles Porel, Frédérick Delay. Contribution of Full Wave Acoustic Logging to the Detection and Prediction of Karstic Bodies. Water, 2020, 12 (4), pp.948. ⟨10.3390/w12040948⟩. ⟨hal-02883337⟩
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