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Structural Modeling:

 

The main objective for building reservoir Static Model for hydrocarbon formations is to provide a representative input and basis for dynamic simulation.

 

 

 

The goal of the 3-D  geological static model is to integrate all the available data, previous studies, experience and knowledge gained by dynamic simulation and geologist’s feedback to achieve the following:

 

 

Establishing the hierarchy of cyclicity is essential to construct a representative stratigraphic framework for reservoir modeling. A cycle set is a package of cycles that shows a consistent progradational, aggradational, or retrogradational trend and cycle refers to the smallest set of genetically-related lithofacies deposited during a single base-level cycle reflecting the depositional environment characteristics.

Reservoirs can be subdivided into third-order sequences and further fourth-order high-frequency sequences. Individual high-frequency sequences can also further be divided into numerous higher-order (fifth-order) depositional cycles represented by distinct vertical lithofacies successions. Vertical lithofacies successions in conjunction with key indicator facies and exposure surfaces are used to define the finer-scale stratigraphic framework.

The gross stratigraphic and structural framework of each reservoir are established based on previous stratigraphic, petrographic and sedimentologic studies, seismic data, log and core data. Understanding of the environment of deposition allows the conceptualization of the modeling strategy in terms of the detailed sub-zonation and the internal layering scheme definitions and quality control of the results.

Framework Modeling Workflow:

Step 1: Sub-zonation
Step 2: Fault Modeling
Step 3: Generation of grid boundary and grid cells
Step 4: Generation of horizons in 3D model
Step 5: Incorporation of 3D models with sub-zones and layering scheme.

After these 5 steps framework model will be ready for petrophysical property modeling