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A Novel Approach for Petro-elastic Characterization of Thin-bedded Gas Bearing Turbidite Reservoirs
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 77th EAGE Conference and Exhibition 2015, Jun 2015, Volume 2015, p.1 - 5
Abstract
This paper describes the first application of an innovative workflow for the petro-elastic characterization of thin-bedded gas bearing turbidite reservoirs. This is a challenging task due to the characteristic centimetric scale of laminations but it is required to properly address reservoir modelling with seismic as a driver. A recently-made-available dielectric dispersion log interpretation provides a coherent formation evaluation at the proper fine scale that is used as primary input to a high-resolution rock physics model.
The targets for the model calibration are wireline sonic and density logs, therefore a Backus upscaling of the high-resolution synthetic elastic properties to the standard log resolution is performed. The petrophysical and elastic characterizations of the key well in the studied area are then integrated into a log-facies model, validated against core data, and extended to the whole reservoir and to a neighbouring well.
The integration with seismic is investigated by means of a fit-for-purpose upscaling technique for facies profiles. The upscale to seismic domain quantitatively assesses how the low seismic resolution impacts on the modelling of thin laminations when different saturation conditions occur. This is mandatory when a seismic driven geo-statistical property distribution is desired as few wells are available.