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Ahead of Print Abstract
AAPG Bulletin, Preliminary version published online
Copyright © 2024. The American Association of Petroleum Geologists. All rights reserved.
DOI:10.1306/01252423011
Organic geochemical characterization of Deltaic Paleogene Rock units in Coos Bay, Oregon: Kerogen type and richness in response to depositional environments
Allison K. Barbato12 , John M. Armentrout3 , Leslie B. Magoon4 , Thomas Demchuk5 , Craig Barrie6* , and Sophie Warny12
1 Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA, USA
2 Museum of Natural Science, Louisiana State University, Baton Rouge, LA, USA
3 University of Oregon, Department of Earth Sciences, Eugene, OR, USA
4 Stanford University, Department of Geological Sciences, Stanford, CA, USA
5 PetroStrat Inc., The Woodlands, TX, USA
6 Applied Petroleum Technology, Sven Oftedalsvei 6, 0950 Oslo, Norway
* Previous Affiliation: GeoMark Research, Ltd., 9748 Whithorn Drive, Houston, Texas 77095
Ahead of Print Abstract
Results indicate that the Lower and Upper Coaledo contain organic-rich coal seams and siltstone that are the most prospective gas-prone source rock units, with kerogen sources ranging from terrigenous to marine. The samples are generally immature, potentially suggesting gas migration from depth. Laminated mudstones exhibited higher average TOC and HI values compared to bioturbated mudstones, but HI appears to be more affected. Substantial discrepancies between outcrop and core geochemistry are evident, with S1 core data ~55% higher, and S2 core data ~90% higher. While part of this variance is attributed to weathering, lithology and depositional environments may also play a role. Furthermore, this study discusses the importance of a hierarchical approach to filtering S2 data for the determination of Tmax. This involves evaluating S2 peak morphology using statistical descriptors such as bimodality, skewness, and kurtosis in combination with an S2 > 0.15 mg HC/g rock.
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