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Integrated Geostatistical and Basin Modeling Approach for 3D Geo-mechanical Modeling

Saturday, 05 November 2016 14:22 Written by 

Measurement of geo-mechanical properties using seismic and laboratory methods conventionally used in oil and gas industry may not be representative of the elastic regime existing in the reservoir owing to sample size. Elastic properties measured using these techniques are restricted to the well location and cannot be interpolated across the reservoir. To overcome these challenges, we describehere an approach for deriving and discretizing geo-mechanical and other elastic properties in the reservoir by integrating results of 3D geo-cellular and basin models.

The workflow presented is utilized to calculate cell-by-cell elastic properties of the reservoir by integrating parameters from both basin model and 3D geo-cellular grid. The basin model reconstructs the burial history by back-stripping the reservoir to its original depositional thickness establishing the mechanical compaction, pore pressures, effective stress, and porosity-vs-depth relationships for the reservoirs. Discretized calculations of geo-mechanical properties were then assigned to each lithotype (facies) in the geo-model. The discretization of elastic properties into 3D grids resulted in better understanding of the prevailing rock elastic properties and stress regimes helping hydraulic fracturing operators in the effective design of their depletion strategies with minimal drilling risks and costs.

This approach provides an innovative way of determining effective minimum horizontal stress for the entire reservoir through distribution of elastic properties in a 3D grid. The conventional approach of using small sample plugs is not sufficient to describe elastic properties for an entire reservoir and can be replaced by the novel approach described above.

Last modified on Friday, 12 October 2018 10:00
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