Schaub, François (2007) Estimation géostatistique de l'impédance acoustique après migration prestack en profondeur. PhD thesis Dynamique et ressources des bassins sédimentaires, Centre de Géosciences, ENSMP p.212.

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Abstract

One of the main goal of geosciences in the petroleum industry is to build accurate and predictive reservoir models, expressed in terms of properties such as geological facies, porosity or acoustic impedance. The seismic reflection technique, at the base of geophysical prospecting, provides the reflection coefficients associated to the geological interfaces. These coefficients give information about the subsurface structures and allow us to estimate the layers petroacoustic properties. We use a preserved amplitude prestack depth migration which gives the depth migrated seismic data, where reflectivity variations versus angle are conserved. The variation analysis is done with the common image gathers sections along trajectories defined by the reflectivity variations with the angle. These trajectories provide a geology depth structural interpretation (the skeleton) with two major AVA attributes: intercept and gradient. A horizon picking phase using both skeletons defines the intervals where the simulation will be achieved. Then, after the interpretation of the hydrocarbons anomalies over the seismic and AVA attributes sections, we propose to locally constrain the geostatistical simulation in order to reproduce these anomalies. To handle it, we use the relationship between the acoustic impedance and the intercept. This method finally provides a depth acoustic impedance section, valid over the whole studied area, which contains the hydrocarbon anomalies for a possible oil and gas exploration & production.

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