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Bosch, Miguel (Universidad Central de Venezuela) | Carvajal, Carla (Universidad Central de Venezuela) | Rodriguez, Juan (Universidad Central de Venezuela) | Torres, Astrid (Universidad Central de Venezuela) | Aldana, Milagrosa (Universidad Simón Bolívar) | Sierra, Jesús (IGS Services and Consulting)
We invert short offset stacked seismic data to jointly estimate reservoir and elastic parameters following a statistical model that relates medium properties with well-logs and petrophysical relations in a gas reservoir area. Our petrophysical model combines the Wyllie equation tointegrate matrix and fluid properties, the Wood equation to account for the fluid mixture properties, and random deviates from these relations. The geostatistical andpetrophysical model parameters were calibrated with well-log data from the reservoir. We simulate the short offset seismic data by convolving the source wavelet with the reflectivity series calculated from the model acoustic impedances, and formulate a combined probability density to jointly honor the geostatistical, petrophysical and geophysical likelihoods. Solutions to the joint inverse problem are obtained with two approaches. In one technique, we use Monte Carlo sampling methods and provide full description of model parameters probability densities. In a second technique, we follow an iterative linearization of the geophysical and petrophysical forward functions to apply Newton''s method solving for the model update of the reservoir and elastic parameters. The results obtained with these inversion methods show very good agreement with the well-log estimates of the impedance, porosity and water saturation in the area.
Tetyukhina, Daria (Delft University of Technology) | Luthi, Stefan M. (Delft University of Technology) | van Vliet, Lucas J. (Delft University of Technology) | Wapenaar, Kees (Delft University of Technology)
Basak, P.S. (Oil & Natural Gas Corporation Limited) | Deb, Abhijit (Oil & Natural Gas Corporation Limited) | Dotiwala, Sucheta (Oil & Natural Gas Corporation Limited) | Sanyal, A. (Oil & Natural Gas Corporation Limited) | Pokhriyal, S.K. (Oil & Natural Gas Corporation Limited)
Lebedev, Maxim (Curtin University of Technology) | Gurevich, Boris (Curtin University of Technology) | Toms, Juliana (Curtin University of Technology) | Clennel, Ben (CSIRO-petroleum) | Pervukhina, Marina (CSIRO-petroleum) | Mueller, Tobias (University of Karlsruhe)