Organic structural properties of kerogen as predictors of source rock type and hydrocarbon potential

FUEL

卷:184

Article

Longbottom, Todd L.¹  Hockaday, William C.¹  Boling, Kenneth S.^1,2  Li, Gaoyuan³  Letourmy, Yohan¹  Dong, Hailiang^3,4  Dworkin, Stephen I.¹ 

[1] Baylor Univ, Dept Geosci, Waco, TX 76706 USA

[2] Univ Tennessee, Dept Earth & Planetary Sci, Knoxville, TN 37916 USA

[3] China Univ Geosci, State Key Lab Biogeol & Environm Geol, Beijing 100083, Peoples R China

[4] Miami Univ, Dept Geol & Environm Earth Sci, Oxford, OH 45056 USA

关键词: Kerogen;    C-13 NMR;    Pyrolysis;    Cretaceous source rock;    Coal;   

DOI  :  10.1016/j.fuel.2016.07.066

来源: Elsevier

【 摘 要 】

This study improves upon previously identified correlations between the chemical structure of kerogen and potential hydrocarbon (oil and gas) yields assayed by Rock-Eval pyrolysis. We propose a quantitative structure-catagenesis relationship that predicts the hydrocarbon generation potential of source rocks and of lacustrine, marine, and terrestrial origin (types I, II, and humic coals). We used one-dimensional solid-state C-13 Nuclear Magnetic Resonance (C-13 NMR) spectroscopy with H-1 spectral editing to determine the abundance of carbon functional groups, including non-protonated and mobile groups. An NMR-based van Krevelen analysis readily separated the kerogen types. Single regression matrices of NMR-based structure parameters against Rock-Eval hydrocarbon yield revealed distinct dynamics of the kerogen types upon pyrolysis. Multiple regression showed that alkyl, oxygen-substituted alkyl, and carbonyl groups were strong contributors to hydrocarbon production, while oxygen-substituted aromatic carbons were strongly counterproductive. Catagenetic relationships established for kerogen provide insight into kerogen structure evolution upon pyrolysis, and can more closely constrain the mechanisms of hydrocarbon generation for use in sedimentary basin modeling. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

Free