--> --> Abstract: Geochemical Fingerprinting in Multi-Stacked Deltaic Reservoirs — Opportunities and Challenges, by Herwig Ganz, Vincent Okpoto, Seye Ososanya, Isaac Olabimtan, Elijah Ukpabio, Ray Berhitoe, Rob Kreulen, and Bart van den Haven; #90082 (2008)

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Geochemical Fingerprinting in Multi-Stacked Deltaic Reservoirs — Opportunities and Challenges

Herwig Ganz1, Vincent Okpoto1, Seye Ososanya1, Isaac Olabimtan1, Elijah Ukpabio1, Ray Berhitoe2, Rob Kreulen3, and Bart van den Haven3
1SPDC, Shell, Port Harcourt, Nigeria
2SIEP, Shell, The Hague, Netherlands
3Isolab B.V., Neerijnen, Netherlands

Fingerprinting technology is probably best known for its capability to monitor co-mingled production. But there are many more applications of geochemical fingerprinting in production and exploration:

● Identify connectivity/compartmentalisation in the field
● Identify corrosion problems
● Identify which formations are actively producing and where inadvertently co-mingling may happen without knowing due to mechanical problems
● Identify potential candidates for co-mingled production (surface and subsurface co-mingling)
● Support solving allocation problems
● Provide a better understanding/improve of the reservoir model
● Determine amount of mud-contamination in PVT samples to derive more accurate PVT data
● Identify oils which have similar fingerprints and whose PVT data could therefore be used to substitute oils where such PVT/compositional data are not available
● Identify origin of oils in litigation cases
● Reconstruct field-filling history and predict hydrocarbon type in near field prospects

In this paper we will present three case histories from Nigeria (Tunu-Kanbo, Soku and Cawthorne Channel Fields). Particular emphasis will be on challenges to properly interpret geochemical fingerprints in multi-stacked deltaic reservoirs. Most oils in Nigeria are the result of complex migration/leakage/spillage/remigration and are actually hybrid oils. The picture is further complicated by the combined effect of multiple transformation processes such as gas/water washing and biodegradation.

AAPG International Conference and Exhibition, Cape Town, South Africa 2008 © AAPG Search and Discovery