Tomographic imaging of a carbonate core using different ultrasonic seismic sources at the laboratory scale : piezoelectric vs point-like pulsed-laser

Chengyi Shen (1) , Daniel Brito (1) , Julien Diaz (2) , Clarisse Bordes (1) , Jean Virieux (3) , Stephane Garambois (3)

1 LFCR - Laboratoire des Fluides Complexes et leurs Réservoirs
2 MAKUTU - Modélisation et simulation de la propagation des ondes fondées sur des mesures expérimentales pour caractériser des milieux géophysiques et héliophysiques et concevoir des objets complexes
3 ISTerre - Institut des Sciences de la Terre

Carbonate rocks are of particular interest in exploration geophysics due to the prosperity of carbonate reservoirs in oil & gas industry. Such rocks are generally heterogeneous, anisotropic, porous and fractured, with complicated sedimentary compositions. Imaging their petrophysical properties can therefore be challenging with classical techniques. We propose here to proceed to the V p seismic tomographic imaging of a circular section of a carbonate core of diameter 10.7 cm based on the first arrival travel times of seismic waves. A point-like pulsed-laser and a piezoelectric transducer are alternatively used as seismic sources and a laser vibrometer records the travelling waves at the periphery of the carbonate core. V p images obtained with both sources are then analyzed and compared to an X-ray CT-scan tomography.

Domaines: Géophysique [physics.geo-ph]

Chengyi Shen, Daniel Brito, Julien Diaz, Clarisse Bordes, Jean Virieux, et al.. Tomographic imaging of a carbonate core using different ultrasonic seismic sources at the laboratory scale : piezoelectric vs point-like pulsed-laser. IMAGE 2021 - Society of Exploration Geophysicists Annual Meeting and Exposition, Sep 2021, Denver, United States. ⟨hal-03287748⟩