Relationships between data from Rock-Eval pyrolysis and proximate, ultimate, petrographic, and physical analyses of 142 diverse U.S. coal samples

Bostick, Neely H.; Daws, Ted A.

doi:10.1016/0146-6380(94)90086-8

Cited by 47 publications

(34 citation statements)

References 14 publications

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“…Although the Rock-Eval 6 instrument has an oxidation temperature of 850°C, incomplete combustion of the refractory coal constituents may lead to too low TOC determinations; this problem is overcome with the CS-200 analyser which has an about twice as high oxidation temperature. The interpretation and pitfalls of Rock-Eval data have among others been discussed by Bordenave et al (1993), Bostick and Daws (1994), Peters (1986) and Sykes and Snowdon (2002). Pitfalls may include interference by the mineral matrix, underestimation of the S 2 signal, influence by retained petroleum, and overloading of the detector.…”

Section: Methodsmentioning

confidence: 94%

The petroleum generation potential and effective oil window of humic coals related to coal composition and age

Petersen

2006

International Journal of Coal Geology

136

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Section: Methodsmentioning

confidence: 94%

The petroleum generation potential and effective oil window of humic coals related to coal composition and age

Petersen

2006

International Journal of Coal Geology

136

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“…Jasper et al, 2009). Comparison of Rock-Eval parameters with a variety of other coal rank parameters has been published by Bostick and Daws (1994).…”

Section: Nevertheless T Max Values In Combination With Hydrogen Indementioning

confidence: 99%

Optical thermal maturity parameters and organic geochemical alteration at low grade diagenesis to anchimetamorphism: A review

Hartkopf‐Fröder

Königshof

Littke

et al. 2015

International Journal of Coal Geology

160

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“…These S 1 values are significantly higher than those obtained by Newman et al (1994,1997: 4 3 mg HC/g rock), and highlight the influence of different Rock-Eval techniques on pyrolysis yields. S 1 s greater than 10 mg HC/g rock in coals from the North Sea and the Mahakam Delta (Durand and Paratte, in Bostick and Daws, 1994) are thought to be indicative of their prolific oil-generating capabilities. In general, coals give lower S 1 peaks than those typically found for petroleum source rocks (Verheyen et al, 1984), and these values become markedly lower at vitrinite reflectances > 1 % (Bostick and Daws, 1994).…”

Section: Rock-eva1 Analysismentioning

confidence: 99%

Relationships Between Hydrocarbon Generation, Coal Type and Rank for Middle Eocene Coals, Buller Coalfield, New Zealand

Norgate¹,

Boreham²,

Kamp³

et al. 1997

Journal of Petroleum Geology

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The Buller Coalfield in the northern portion of the Paparoa Trough (NW South Island, New Zealand) contains a middle Eocene bituminous coal‐bearing succession that exhibits marked variations in both coal rank and type. The across‐basin rank changes result from differential late Palaeogene subsidence of the Paparoa Trough and subsequent inversion. Superimposed upon coalification trends are down‐seam variations in coal type, evidenced by isorank variation in conventional chemical parameters. These type variations are not a consequence of changes in maceral group proportions, which are dominated by vitrinite. Forty‐eight coal samples from fifteen drillholes through the Brunner Coal Measures have been examined for vitrinite reflectance, proximate analysis, specific energy, and sulphur content. Total Organic Carbon (TOC), Rock‐Eval properties and the bulk composition of the bitumen were also determined. All the coals analysed lie within the high volatile bituminous B to medium volatile bituminous coalification stages. Variation in analytical properties within this suite, and more specifically within serial samples, provides insights into the nature of the organic matter comprising the coals. While TOC varies systematically with ash content, reflecting proximity of the depositional mires to fluvial systems, values increase with rank (68–86% ash free). The Hydrogen Index (HI) decreases from 334 to 190 mg hydrocarbons/g TOC over a range of 429 to 470 d̀C Tmax, analogous to the volatile matter content and vitrinite reflectance, respectively. The more perhydrous coal samples at a given rank are characterised by depressed Tmax/vitrinite reflectance and elevated Hi/volatile matter contents. Bitumen and sulphur contents are not the primary control onperhydrous characteristics. The bitumen content crudely corresponds to the S1 peak plus the initial portion of the S2 peak liberated under low temperatures during Rock‐Eval pyrolysis; however, the bulk of the generative potential is associated with the residual kerogen fraction. Suggate (S) Rank and maximum palaeotemperature appear to be the best indicators of coal rank. A period of significant hydrocarbon generation and release begins at Tmax∼440d̀C for the Buller coals. The main oil “window” is defined by the interval 440–455d̀C Tmax or 0.8–1.1% vitrinite reflectance (Romax), and by correlation to maximum palaeo‐temperatures, 125–155d̀C. This is further substantiated by mass balance considerations, which indicate that hydrocarbon generation (Petroleum Generation Index (PG1) > 0.1) was occurring in the coals at a maturity level of O. 7–0.9 % Romax (Tmax 440–444 d̀C) with an increase in PGI between ∼0.9 and 1.1% Romax (∼Tmax 445–455 d̀C). Between PGI 0.1 and 0.4, the expulsion efficiency rapidly increased, presumably due to generation and expulsion of the bulk of the oil.

show abstract

Relationships between data from Rock-Eval pyrolysis and proximate, ultimate, petrographic, and physical analyses of 142 diverse U.S. coal samples

Cited by 47 publications

References 14 publications

The petroleum generation potential and effective oil window of humic coals related to coal composition and age

The petroleum generation potential and effective oil window of humic coals related to coal composition and age

Optical thermal maturity parameters and organic geochemical alteration at low grade diagenesis to anchimetamorphism: A review

Relationships Between Hydrocarbon Generation, Coal Type and Rank for Middle Eocene Coals, Buller Coalfield, New Zealand

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