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Enhanced Reservoir Description of Rudrasagar Field

Rajesh C. Madhwal, Chandra Prabha Verma, and Birbal Singh
INTEG, GEOPIC, ONGCL, Dehra dun, India

Hydrocarbon reservoir quality is mainly controlled by two properties - storage capacity (porosity) and flow capacity (permeability). Characterisation of these parameters in the hydrocarbon bearing Sand of Rudrasagar field is the focus of this study.

Permeability profiles for the wells of above mentioned wells have been estimated by quantitatively integrating information from both core and well logs by employing combined use of the concept of mean hydraulic radius and Alternating Conditional Expectation (ACE) algorithm. Permeability values estimated from the ACE are in agreement with core measured values thereby indicating that the ACE has satisfactorily generalized the relationship between permeability and well logs.

Application of geostatistics is invoked to generate 2-D and 3-D variations of permeability and porosity to characterize reservoir heterogeneity in terms of these parameters. Detailed characterization of reservoir heterogeneity in terms of porosity and permeability provide valuable information useful in the context of field development, water shut off and reinterpretation of well test data. Thus developed three dimensional models of porosity and permeability can be utilized in simulation studies for more realistic prediction.

In this paper, a theoretically correct and fundamentally derived relationship between the porosity and permeability is proposed. The influences of various geological variables that control fluid flow are reflected in the proposed methodology.

Presentation GEO India Expo XXI, Noida, New Delhi, India 2008©AAPG Search and Discovery