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Petroleum Source Rock Kinetics of Outcrop Analogues, NW Sabah Basin, East Malaysia from Non-Isothermal Open System Pyrolysis
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Petroleum Geoscience Conference & Exhibition 2013, Mar 2013, cp-340-00057
Abstract
This study discusses the application of a non-isothermal open system pyrolysis method using Source Rock Analyzer-Kinetics (SRA-Kinetics) to characterise and predict the hydrocarbon generation profile of Tertiary rock samples mainly from the NW Sabah Basin, East Malaysia. SRA-Kinetics data of onshore outcrop samples from NW Sabah, East Malaysia reveal that most of the samples have a wide distribution of activation energies (Ea) that are usually associated with Type III terrigenous organic matter. That property implies that similar source rocks in the subsurface would also have a wider window for hydrocarbon generation, compared to Type I source rocks. This increases the probability of filling structures with hydrocarbons, as long as they were formed within the wide hydrocarbon generating window. The distribution of activation energies in the slump deposits associated with the West Crocker Formation has a strong resemblance to the younger Belait Formation. Backed up by vitrinite reflectance thermal maturity data and recently obtained biostratigraphic data, it is proposed that these slump deposits were derived from younger geological units that were eroded and re-deposited over older geological units such as the West Crocker Formation.