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Etude des variations de l'amplitude de la réflectivité du sous-sol après imagerie sismique en profondeur

Abstract : In oil exploration, seismic reflexion imaging is commonly used. This method gives a first estimation of the structures of the sub-surface and also an estimation of the reflection coefficients changes which are related to changes in petrophysics parameters (density, compression and shear velocities). An analysis of these variations allows us to estimate the elastics parameters which are essential and complementary to the interpretation of the reservoirs. The classical processing consists in studying the amplitude variation directly on data recorded as a function of offset and time of propagation. The analysis is done using an inversion of a linear approximation of the Zoeppritz's equations governing the theoretical amplitude changes. In our case, we consider the analysis of the amplitude variation after the imaging step, directly in the depth domain. In order to success in this analysis, we propose a post-imaging processing before the amplitude versus angle analyse to compensate for erroneous migration velocity fields, interference of the wavelet in the case of thin bed and the wavelet stretching. This processing also gives us a skeleton which represents a depth interpretation of the geologic structure.
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Submitted on : Wednesday, June 21, 2006 - 8:00:00 AM
Last modification on : Tuesday, September 29, 2015 - 10:32:45 AM
Long-term archiving on: : Thursday, September 30, 2010 - 7:30:07 PM

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Alexandre Egreteau. Etude des variations de l'amplitude de la réflectivité du sous-sol après imagerie sismique en profondeur. Sciences of the Universe [physics]. École Nationale Supérieure des Mines de Paris, 2005. English. ⟨pastel-00001811⟩

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