Reservoir Characterization

Static Reservoir modeling, also sometimes referred to as Reservoir Characterization is carried out to determine reservoir architecture and quality with respect to distribution of porosity, permeability and rock properties.


Reservoir Characterization workflow

Data Preparation

Data preparation consists of organizing, formatting and uploading data into standard software packages. It is followed by a quality-control process for assessing and generating sufficient, accurate and curated data required in further modeling steps. Refer to details in iOG Data management offerings.

3D Structural Modelling

Preparation of the 3D structural model consists of the bounding surfaces and the faults. In this model the seismic surfaces generally are converted to depth and adjusted for the well tops of the key marker surfaces. Some key elements of 3D structural modeling include

  • Fault geometry
  • Fault-to-fault relationships
  • Ensure that fault-to-bounding-surface contacts are a perfect match (this prevents later problems during flow simulation)

3D Sedimentary Modelling

Sequence stratigraphy based internal stratigraphic layering (bedding geometry) and the facies are used for building the 3D Sedimentary Model. It involves the preparation of the following models sequentially.

  • 3D Stratigraphic Model
  • 3D Facies Model

3D Petrophysical Modelling

After facies modeling, the petrophysical properties are interpolated on a facies-by-facies basis, using the sedimentary model as a template.

Upscaling

The high-resolution petrophysical model often has many millions of grid cells and the high-resolution model needs to be simplified (UPSCALED) before proceeding to the flow simulation. Upscaling, also referred to as homogenization, is substituting a heterogeneous property region consisting of fine grid cells with an equivalent homogeneous region made up of a single coarse-grid cell with an effective property value. Upscaling is performed for each of the cells in the coarse grid and for each of the grid properties needed in the reservoir flow-simulation model. It is essentially an averaging procedure in which the static and dynamic properties of a fine-scale model are approximated by that of a coarse-scale model. Upscaling the grid geometry also upscales the petrophysical properties.

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