Joint inversion of compressional and shear seismic data in native time domains
AssigneeCgg Services SAS
InventorBenjamin ROURE
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Abstract
PP and PS seismic data are jointly inverted in a stratigraphic grid, using different time axes for PP and PS reflections. A ratio of PP and of PS waves'travel times inside a same layer cell maintained to be a function of a ratio of a P-wave propagation velocity and of an S-wave propagation velocity therein. Since PP and PS seismic amplitudes and travel times are due to elastic properties of the same structure, they can be inverted at the same time to provide better estimates of these elastic properties.
Claims20
A method for simultaneously inverting PP and PS seismic amplitudes in native time domains with optimized registration through travel times' estimations, the method comprising:
- obtaining PP and PS seismic data acquired during a seismic survey of a multi-layer structure;
- and
- jointly inverting the PP and the PS seismic data in a stratigraphic grid, using different time axes for PP and PS reflections, wherein a ratio of PP and of PS waves travel times inside a same layer cell is a function of a ratio of a P-wave propagation velocity and of an S-wave propagation velocity therein.
A seismic data processing apparatus comprising:
- a communication interface configured to obtain PP and PS seismic data acquired during a seismic survey of a multi-layer structure;
- and
- a data processing unit configured to jointly invert the PP and the PS seismic data in a stratigraphic grid, using different time axes for PP and PS reflections, a ratio of PP and of PS waves travel times inside a same layer cell being a function of a ratio of a P-wave propagation velocity and of an S-wave propagation velocity therein.
A computer-readable recording medium non-transitorily storing executable codes which, when executed on a computer, make the computer perform a method for simultaneously inverting PP and PS seismic amplitudes, in native time domains with optimized registration through travel times' estimations, comprising:
- obtaining PP and PS seismic data acquired during a seismic survey of a multi-layer structure;
- and
- jointly inverting the PP and the PS seismic data in a stratigraphic grid, using different time axes for PP and PS reflections, a ratio of PP and of PS waves travel times inside a same layer cell being a function of a ratio of a P-wave propagation velocity and of an S-wave propagation velocity therein.
Dependencies are inferred from the claim text.