From Petroleum Systems Modeling to Fluid Prediction—A Story: Choosing the Right Kinetics may be the Wrong Thing to do
Published:December 01, 2012
Robert Tscherny, Marek Kacewicz, Barry J. Katz, Joe Curiale, Lothar Friberg, Irene Arango, 2012. "From Petroleum Systems Modeling to Fluid Prediction—A Story: Choosing the Right Kinetics may be the Wrong Thing to do", New Understanding of the Petroleum Systems of Continental Margins of the World, Norman C. Rosen, Paul Weimer, Sylvia Maria Coutes dos Anjos, Sverre Henrickson, Edmundo Marques, Mike Mayall, Richard Fillon, Tony D’Agostino, Art Saller, Kurt Campion, Tim Huang, Rick Sarg, Fred Schroeder
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Choosing the right kerogen for hydrocarbon (oil and gas) generation kinetics to predict hydrocarbon phase and properties such as API gravity and GOR using petroleum systems models is usually a challenge. Common procedure in industry is to select a multi-component kinetics dataset based on available geochemical data and a basin analogue. This kinetics is usually derived from a measurement of 1 or 2 samples of an immature source rock representing a specific kerogen type or source facies. Testing indicates that it currently makes little difference whether a programmed default is used or a basin-specific dataset is utilized. The important question remains, how well does a selected sample represent the source rock variability within the fetch area? This question is quite often neglected. In addition to this conceptual issue, the alteration of hydrocarbons during migration and within the trap are usually not explicitly modeled, largely as a result of the limited understanding of the processes involved, which precludes their quantification. Examples from the South Atlantic continental margins, applying this new solution, which implicitly includes many of the important factors such as source rock variability and migration effects, will be presented. The proposed solution results in significantly improved prediction of the quality of hydrocarbon product, phase, and properties such as GOR, API gravity, and viscosity.