Seismic Calibration Philosophy

We believe that it's the responsibility of the geophysicist to translate seismic results in something useful to engineers and other geosciences, not the other way around. Seismic attributes volumes derived form inversion, curvature or amplitude/velocity anisotropy must be translated into volumes than can be understood and used by other disciplines such as porosity, permeability, facies, fracture density, fracture permeability anisotropy, and stress. Providing this kind of seismic insight requires careful calibration with multiple data types and close collaboration with all geoscientist and engineers involved. We then build geological grids that contain all the calibrated information that are ready to support exploration and development decisions that may even include flow simulation. 

Matrix calibration philosophy 

  • Emphasizes the definition of facies flags that are related to production drivers.

  • Emphasizes the use of inverted seismic attributes (AI and VpVs ratio) or frequency decomposition attributes extracted along well paths (verticals and horizontals) for identification of facies in multidimensional crossplots of elastic properties.

  • Emphasizes the use of facies that can be detected at seismic scale. 

  • Statistical in nature: does not attempt to use inverted seismic attributes to match detailed variations along well paths but rather larger scale variability

  • Results are probabilistic and include estimates of error.

Fracture calibration philosophy

  • Separates the calibration depending on their origin (joints vs faults), scale, and flow properties.

  • Uses any fracture information available from outcrops, image logs, mud gas shows, cross-dipole sonics or other log indicators, microseismic, and production data.

  • Takes into account the state of stress in determination of possible flow properties.

  • Statistical in nature: does no attempt to match 3D seismic fracture attributes to detailed fracture variations along well paths or particular microseismic events.

  • Assumes that statistics of fracture orientations is scale invariant.
     

The calculators we feature here are just an example of the kind of multidisciplinary work we do in order to get a comprehensive picture of the main factors that affect fluid flow in fracture models.