--> ABSTRACT: Evolving a Reservoirs Understanding through the Use of Field Analogues and Facies Associations: Case Study from the Niger Delta, by Robinson, Adam J.; #90135 (2011)
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Evolving a Reservoirs Understanding through the Use of Field Analogues and Facies Associations: Case Study from the Niger Delta

Robinson, Adam J.1
(1)Nigeria Business Unit, OML-123, Addax Petroleum, Geneva, Switzerland.

The Adanga North Horst Field of the OML-123 license (Eastern Niger Delta, offshore Calabar) has proven STOIIP of approximately 140MMstb straddled over two major stacked parasequences of the Miocene age P-Sands. The depositional setting of these sands is a classic delta prograde sequence where marine shales act as the primary vertical pressure seal between reservoirs. Within the prograding stacked parasequences, lower-order coarsening upward sequences can, where rock quality is poorer (often at flooding event surfaces), have the ability to act as baffles/seals to fluid phase-fill and pressure depletion.

The Niger Delta is well known for its world class reservoirs where prolific oil and gas accumulations have been discovered and developed. The reservoir model has served as one of the key instruments into predicting field performance and behaviour. The key to successful reservoir management is the understanding of the baffles and seals within the system to predict the most likely reservoir performance.

In this case study the establishment of deterministic-based geological models through the use of the outcrop analogue and core-observed facies associations are used to supersede the more common practise of stochastic-based geological models improving Previous HitcoreNext Hit-to-Previous HitlogNext Hit integration and enabling alternative methods to constrain baffles and seals and rock properties, such as, Previous HitporosityNext Hit-Previous HitpermeabilityNext Hit Previous HitrelationshipsTop within the stacked parasequence.

With a more deterministic approach to model baffles and seals through appropriate facies associations, theory on fluid fill and behaviour can be better modelled into the dynamic simulator to assist to improve field-wide and individual well history match and prediction.

 

AAPG Search and Discovery Article #90135©2011 AAPG International Conference and Exhibition, Milan, Italy, 23-26 October 2011.