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The Minagish Field tar mat, Kuwait; its formation, distribution and impact on water flood

Hamad Al-Ajmi, Andrew C. Brayshaw, Anthony G. Barwise and Ram S. Gaur
The Minagish Field tar mat, Kuwait; its formation, distribution and impact on water flood
GeoArabia (Manama) (2001) 6 (1): 7-24


In common with many giant oilfields world wide, the Minagish field (Minagish Oolite Formation) in Kuwait has an areally extensive heavy oil zone of variable thickness at the base of the oil column. The heavy oil zone, or tar mat, is thought to act as a partial permeability barrier between the aquifer and oil leg, but its field-wide effect and properties were unknown. A full-field water flood is planned for the Minagish field. Therefore, an understanding of the distribution and properties of the heavy oil zone is critical in deciding whether to inject water above the tar mat (with unavoidable reserve losses) or directly into the aquifer in areas where the tar mat is poorly developed. The difficulty in discriminating between cemented and bituminous intervals on electric logs has led to the adoption of geochemical techniques to detect the presence and thickness of heavy oil zones. By using detailed Iatroscan analysis, the tar mat is characterized by a high proportion of asphaltenes, but low concentration of saturates, polars and aromatics. Results of geochemical analyses demonstrate that the Minagish tar mat is the result of de-asphalting rather than gravity segregation. Compositional variations through the oil column have been mapped using geochemical parameters measured on core samples. A predictive model for API gravity and live oil viscosities has been established for the field. This new understanding of the Minagish tar mat, its genesis and spatial distribution has helped in developing a water injection strategy that maximizes recovery in the Minagish field.

ISSN: 1025-6059
Serial Title: GeoArabia (Manama)
Serial Volume: 6
Serial Issue: 1
Title: The Minagish Field tar mat, Kuwait; its formation, distribution and impact on water flood
Affiliation: Kuwait Oil Company, Kuwait
Pages: 7-24
Published: 2001
Text Language: English
Publisher: Gulf Petrolink in Bahrain, Manama, Bahrain
References: 6
Accession Number: 2001-030881
Categories: Economic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
N29°00'00" - N30°00'00", E47°00'00" - E49°00'00"
Secondary Affiliation: BP Kuwait, KWT, Kuwait
Country of Publication: Bahrain
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute.
Update Code: 200110
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