Compagnie Generale De Geophysique

Institut Francais Du Pe'trole

Gaz De France

Institute Francais Du Petrole

Gaz De France-service National

Storengy

Ifp Energies Nouvelles

Cggveritas Services S.a.

Gdf Suez

Frédéric Huguet

Julien Meunier

Patrick Meynier

The invention relates to a characterization method for characterizing the performance of wells in a stockpile or deposit of compressible fluid, the method comprising the steps of:

Methodology for determining curves of productivity of wells for exploiting underground gas storage and underground natural reservoir of compressible fluids

A device for seismic emission in an underground formation comprising one or more vibrators of any type and method for implementing same. According to a preferred embodiment, each vibrator comprises at least one pillar () of sensitive elements (of piezoelectric type for example) between two end plates or slabs () and a signal generator for applying vibrational signals to the pillar. The pillar () is coated with a protective sheath () and the vibrator is positioned in a well or cavity (W) and embedded in a mass of a solid coupling material () in contact with protective sheath () and the two end plates () over at least part of each of the respective faces thereof, which provides coupling of the vibrator with the surrounding formation. The vibrators can be buried at intervals in relation to one another in a well. Sequential triggering thereof with selected delays allows reinforcement of the waves emitted by the device in a preferred direction. Applications include repetitive seismic monitoring of an underground reservoir during development for example.

Device for seismic emission in an underground formation and method for implementing same

This invention is a method of separating induced microseismicity signals from seismic signals acquired within active seismic monitoring operations carried out in underground zones under development which has application for monitoring of underground hydrocarbon or fluid storage reservoirs. Seismic records are formed from signals emitted by one or more seismic sources controlled by orthogonal signals. In this case, the signals are processed to separate the respective contributions of the at least one seismic source to the signals received and to reconstruct the seismograms equivalent to those that would be obtained by actuating the at least one seismic source separately. The induced microseismicity signals (passive seismic signals) are separated from the seismic signals coming from sources (active seismic signals) essentially by isolating the contribution thereof by comparison with a spectral reference model at the fundamental frequencies emitted and at the respective harmonics thereof, and by reconstructing in the time domain the induced microseismicity signals and the signals coming from the at least one seismic source.

Method for separating microseismic signals from seismic signals emitted by one or several sources

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Fosses, France

Frédéric Huguet