Ekofisk field reservoir characterization: Mapping permeability through facies and fracture intensity

Journal Article · Mon Dec 01 04:00:00 EST 1997 · SPE Formation Evaluation

DOI:https://doi.org/10.2118/35527-PA· OSTI ID:556870

Agarwal, B ^[1]; Allen, L R; Farrell, H E

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1. Phillips Petroleum Co., Stavanger (Norway)

The development of a strategy for the detailed three-dimensional (3D) description of permeability was a key ingredient of the recent reservoir characterization study of the Ekofisk field. Because the ultimate objective of this characterization effort was the construction of a new full-field 3D reservoir flow model, permeability and its heterogeneity received special focus. Permeability has a tremendous influence on history matching of reservoir fluid flow models and, in turn, reservoir-management decisions. This is particularly true in a mature, waterflooded field such as Ekofisk. The Ekofisk field is a high-porosity, low-matrix permeability naturally fractured chalk. Fluid-flow characteristics of the reservoir are largely governed by the distribution, orientation, and interconnectivity of the natural-fracture system. To honor this mechanism, an algorithm was developed based on the log linear relationship between fracture spacing (intensity) data from core and well-test effective permeability. To capture the intrinsic heterogeneity and complex nature of Ekofisk field, the basic relationship between fracture intensity and permeability was modified to incorporate variations associated with (1) chalk facies; (2) fracture type; (3) porosity; (4) structural location; (5) structural curvature; and (6) silica content. To calibrate the algorithm, permeability determined from distributing total well-test flow capacity (kh) based on production log contribution was used as a tuning parameter. As a final step, geostatistical techniques were used to ensure that permeabilities derived from the algorithm matched those obtained from well-test analysis.

• Sponsoring Organization: USDOE
• OSTI ID: 556870
• Journal Information: SPE Formation Evaluation, Journal Name: SPE Formation Evaluation Journal Issue: 4 Vol. 12; ISSN 0885-923X; ISSN SFEVEG
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
FLOW MODELS
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
LIMESTONE
NATURAL GAS FIELDS
NORTH SEA
NORWAY
OIL FIELDS
PERMEABILITY
POROSITY
SILICA
THREE-DIMENSIONAL CALCULATIONS