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Abstract: Previous HitSeismicNext Hit Response Interpretation for Heterogeneous Reservoir Models

Patrick Fichtl, Frederique Fournier

Previous HitSeismicNext Hit information is crucial to constrain the reservoir image between wells. However, in heterogeneous environments, it is often difficult to interpret the Previous HitseismicNext Hit response of the reservoir, especially with limited well control. Analyses of synthetic Previous HitseismicNext Hit responses of typical reservoir models are helpful for defining the geological information contained in the Previous HitseismicNext Hit data.

We propose a geological interpretation of Previous HitseismicNext Hit responses of various models in the frame of fluvio-deltaic deposits: The first model is the intermediate unit of the Mesa Verde outcrop, whose Previous HitseismicNext Hit response was computed by elastic wave modelling, after assignment of elastic parameters constant by lithofacies. The other models correspond to stochastic lithofacies simulations with different geostatistical characteristics. Their Previous HitseismicNext Hit responses were computed with ID modelling (convolution).

The geological interpretation carried out on those synthetic Previous HitseismicNext Hit data is based on a calibration of the Previous HitseismicNext Hit parameters in terms of probabilities of encountering the different lithofacies. The technique we use is a non parametric discriminant analysis. The Previous HitseismicNext Hit parameters are the amplitudes for the convolution models or impedances and reflection coefficients for the first model for which a post-stack stratigraphic inversion was carried out.

We compare the Previous HitseismicNext Hit derived lithofacies to the true ones to determine the potential of the Previous HitseismicNext Hit data for describing the reservoir heterogeneities. We use the different models to discuss:

- the impact of the spatial distribution of heterogeneities on the geological interpretation of the Previous HitseismicNext Hit data;

- the influence of the Previous HitseismicTop lateral filtering on the interpretation;

- the influence of the number of wells, used in the interpretation, on the final results.

AAPG Search and Discovery Article #90956©1995 AAPG International Convention and Exposition Meeting, Nice, France