--> Abstract: Hybrid Reservoir Model - a New Approach for more Geological Production History Match in Mature Fields, by Vincent Marlot, Louise Den - Boer, Celine Menon - Chassan, and Pascal Lendres; #90072 (2007)

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Hybrid Reservoir Model - a New Approach for more Geological Production History Match in Mature Fields

Vincent Marlot1, Louise Den-Boer2, Celine Menon-Chassan2, and Pascal Lendres2
1Total Exploration & Production, Pau Cedex, France
2Total Exploration & Production,

Managing geophysical, geological and dynamic uncertainties in reservoir models is a well-known process today. The spatial Montecarlo approach, by generating hundreds of possible reservoir models, allows calculating the STOOIP statistical distribution and defining the parameters which impact the most the production history match.
A new step has been reached today with hybrid models. Rather than using “petrophysical patches” during the production history match process, the reservoir engineer chooses the best matching realisations of the static model, for given areas around wells. The geologist uses these constraints to generate new realisations of the static model, coherent with the geometry, the sedimentary scheme, the petrophysics and their associated uncertainties. The new models, geologically meaningful, are re-exported to dynamic simulation. This iterative process gives good results in mature field cases, on which history match is difficult to obtain, due to the amount of data to honour.
The field case presented is made of sandy Turbidite reservoir. Discovered in 1962, it has been penetrated by over 50 wells now and has been producing for 40 years. The poor seismic resolution and the very high amount of laminated facies make reservoir modelling difficult, with no satisfying history match. They also induce a strong hypothesis of by-passed oil pools in low permeability, strongly laminated facies. More than 300 static models were generated in a first pass and 3 hybrid modelling iterations were run, to finally get a satisfying history match. The new model confirms the remnant potential of laminated facies and increases significantly STOIIP, allowing a new development phase.

 

AAPG Search and Discovery Article #90072 © 2007 AAPG and AAPG European Region Conference, Athens, Greece