Powerful Forward Modeling for Reservoir Property Analysis
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Advanced Rock Physics Modeling for Reservoir Characterization
SeisMod creates comprehensive rock physics models for forward modeling Vp, Vs, and density logs across various reservoir conditions. This powerful tool generates derived attributes including relative properties and reflectivities from modeled logs at both well-log and seismic resolutions in time or depth domains.
Rock Physics Model Foundation
The foundation of SeisMod’s capabilities is a robust rock physics model comprising:
- Moduli and densities of rock constituents
- Effective media relationships that accurately reconstruct measured rock properties
Well-Log Inversion: Building the Rock Physics Model
SeisMod allows precise definition of your rock physics model through:
Effective Media Relationship Selection
- Solid mixing relationships: Hill Average, Hashin-Shtrikman, and more
- Fluid mixing approaches: Wood, patchy, and alternatives
- Porosity inclusion methods: Krief, critical porosity, and others
- Fluid inclusion modeling: Gassmann’s equations
Rock Constituent Property Estimation
- Volume fraction determination: Uses inputs from petrophysical/mineralogical evaluations (note: these evaluations are performed outside SeisMod)
- Fluid property computation: Utilizes Batzle and Wang equations for accurate fluid moduli and densities
- Solid constituent analysis: Employs iterative well-log inversion to determine optimal moduli and densities
The final model parameters are those that minimize differences between modeled and measured logs, ensuring the highest accuracy in subsequent analysis.
Well-Log Modeling: Forward Prediction
Once your rock physics model is defined, SeisMod enables:
- Modification of reservoir properties
- Reconstruction of Vp, Vs, and density logs under different conditions
- Computation of relative/absolute rock properties or reflectivities
- Analysis at well-log or seismic resolutions in time or depth domains
- Property variation by percentage of in-situ value or as constant volume fraction ranges
- Time-domain plotting at in-situ time-depth or at two-way-time resulting from property modifications
3D Model: Advanced Synthetic Dataset Creation
The 3D Model module creates datasets with perturbed well-data in target intervals, generating synthetic seismic for:
- Evaluation and calibration of seismic inversions
- Estimation of seismic attributes’ sensitivity to petrophysical property changes
3D Model Methodology
Calculates seismic attributes in time or depth at well-log or seismic resolutions
Creates 3D volume of petrophysical properties from well evaluation, with two properties modified along inline and crossline directions (e.g., porosity in inline, mineralogy in crossline)
Computes Elastic Rock Properties (VP, VS) and density for each pseudo-well in the 3D volume
Calculates seismic attributes in time or depth at well-log or seismic resolutions