Ranking of Possible Processes Leading to Heavy Oil Zones by Basin and Petroleum Systems Modeling — A Kuwait Case
Study
Biodegradation, water washing, oil mixing, degassing along faults and gravity segregation are possible reasons for alteration processes in reservoirs that can lead to heavy oil occurrence. Detailed knowledge of the charge history of the reservoir is one critical element in order to understand these processes. The description of the charge history and the natural processes that lead to a heavy oil occurrence in the reservoir can be assessed by Basin and Petroleum Systems Modeling over geologic timescales using high resolution multi phase kinetic reactions for the kinetic modeling of source rock maturity and the produced crude oils, in combination with PVT modeling of the reservoir. Source rock tracking allows the description of the charge history of each accumulation in high detail.
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In basin and petroleum systems modeling, the resolution of the model is in most cases too coarse to be able to describe the distribution of single components of oils in reservoir scales properly. In large, regional scale petroleum systems on the other hand, the kitchen areas of the source rocks can be sometimes tens to hundreds of km away from the trap structures where the accumulations can be found. To solve this dilemma a new method is applied to an oilfield in Kuwait by combining a regional scale petroleum systems model with a local high-resolution model of the field.
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AAPG Search and Discover Article #90100©2009 AAPG International Conference and Exhibition 15-18 November 2009, Rio de Janeiro, Brazil