Correlation among Vitrinite Reflectance Ro%, Pyrolysis Parameters, and Atomic H/C Ratio: Implications for Evaluating Petroleum Potential of Coal and Carbonaceous Materials
Journal of Energy and Natural Resources
Volume 3, Issue 6, December 2014, Pages: 85-100
Received: Nov. 21, 2014; Accepted: Dec. 7, 2014; Published: Dec. 18, 2014
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Authors
Hsien-Tsung Lee, Department of Electrical and Information Technology, Nan Kai University of Technology, Nan Tou County, Taiwan
Li-Chung Sun, Department of Electrical and Information Technology, Nan Kai University of Technology, Nan Tou County, Taiwan
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Abstract
In this study, 26 samples from northwest Taiwan, 12 from Mainland China, 13 from Australia and 39 from literature were jointly examined to explore relationships among pyrolysis parameters, Vitrinite Reflectance Ro%, and Atomic H/C ratio. Samples of mixed high and low maturity coal were combined in proportions determined by the total quantity in the furnace prior to the Rock-Eval analysis and used to explore the correlation between the pyrolysis parameter, Tmax, and the vitrinite reflectance. These average values were then plotted against the corresponding Tmax results. The experimental results revealed that:(1) For low maturity coal samples that were mixed with different proportions of high maturity coal samples, the Tmax values fell within a range of low maturities. Alternativly, for samples containing the reworked sedimentary materials in the rock formation, the Tmax values were similar to the maturity of young material. (2) For sampling or Rock-Eval analysis of the high maturity materials, contamination with low maturity material should be avoided, even in very small amounts. (3) Afterproportional mixing, there was no evidence of a general linear relationship between the average of vitrinite reflectance, Ro%, and the corresponding Tmax value recorded. The atomic H/C ratio, as well as the BI, HI, QI, S1, and S2, generally decreases while the maturity (Tmax (oC); vitrinite reflectance Ro%) increases. The atomic H/C ratio decreases slightly from 1.1 to 0.7 while maturity increased from Ro 0.55% to 0.85%. Samples with atomic H/C ratio within this range show significant change in certain other geochemical parameters (eg. BI, HI, QI, PI, S1, S2, S1+S2, Tmax). Organic matter in the samples studied is of type II/III kerogen based on the relationship between HI and Tmax. The hydrocarbon potential per unit organic carbon (S1+S2/TOC) of the organic matter in this study to be approximately 100~380, similar to the potential of humic coal used in general gas and oil production. This shows that organic matter in an oil window of Ro%=0.55 and atomic H/C=1.1 have reached a certain maturity and hydrocarbon potential. Overall, when the atomic H/C ratio increases, the BI, HI, QI, S1, and S2 also show an increasing trend; therefore, these parameters and atomic H/C ratio show a certain correlation.
Keywords
Atomic H/C Ratio, Vitrinite Reflectance Ro%, Kerogen, Rock-Eval Pyrolysis Tmax, Maceral Analysis, Reworked
To cite this article
Hsien-Tsung Lee, Li-Chung Sun, Correlation among Vitrinite Reflectance Ro%, Pyrolysis Parameters, and Atomic H/C Ratio: Implications for Evaluating Petroleum Potential of Coal and Carbonaceous Materials, Journal of Energy and Natural Resources. Vol. 3, No. 6, 2014, pp. 85-100. doi: 10.11648/j.jenr.20140306.12
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