MATURITY MODELING OFTHE CHUM SAENG FORMATION, PHITSANULOK BASIN, THAILAND
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Abstract
The Queen Sirikit Field, Phitsanulok Basin, Thailand has two previous source rock maturity studies with conflict-ing results. It is unclear whether the source kitchen is the Sukhothai Depression or the Bung Bon Depression. The present study used a 1-D BasinMod approach for nine wells and one pseudo well across the Sukhothai and Bung Bon Depressions. Burial and thermal histories during basin development were based on a rifting tectonic geosystem. Heat flow was calculated by applying the transient model. Sensitivity calibration used measured vitrinite reflectance and Tmax data. The maturity model closely matches the hydrocarbon discoveries in the study area. Modeling suggests that potential source rocks are in the early to middle oil window across most of study area and in the gas generation window within the Sukhothai Depression. Oil started to generate and expel during the middle to late Miocene, along with some associated gas in wells located near the Sukhothai Depression. As the geothermal gradient varies laterally, the source rocks entered an oil maturity level at different depths ranging from 2,000 to 2,500 m. The gas generation window was reached at depths around 4,500 m. There is remaining potential in the area at locations close to Sukhothai Depression.
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Copyright © 2008 Department of Geology, Faculty of Science, Chulalongkorn University. Parts of an article can be photocopied or reproduced without prior written permission from the author(s), but due acknowledgments should be stated or cited accordingly.
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