DOI: 10.1306/06021413204
Scopus记录号: 2-s2.0-84922653814
论文题名: Thermal-maturity limit for primary thermogenic-gas generation from humic coals as determined by hydrous pyrolysis
作者: Lewan M.D. ; Kotarba M.J.
刊名: AAPG Bulletin
ISSN: 0149-1552
EISSN: 1558-9282
出版年: 2014
发表日期: 2014
卷: 98, 期: 12 起始页码: 2581
结束页码: 2610
语种: 英语
Scopus关键词: Bituminous materials
; Coal
; Gas generators
; Hydrocarbons
; Hydrogen
; Iodine
; Kerogen
; Oil shale
; Organic carbon
; Reflection
; Atomic H/C ratio
; Experimental conditions
; Hydrogen indices
; Hydrous pyrolysis
; Reflectance values
; Thermal maturity
; Total Organic Carbon
; Vitrinite reflectance
; Gases
; coal
; economic geology
; experimental study
; gas
; gas production
; hydrogen
; lignite
; pyrolysis
; reflectance
; solubilization
; source rock
; temperature effect
; vitrinite
Scopus学科分类: Energy
; Earth and Planetary Sciences
英文摘要: Hydrous-pyrolysis experiments at 360°C (680 F) for 72 h were conducted on 53 humic coals representing ranks from lignite through anthracite to determine the upper maturity limit for hydrocarbon-gas generation from their kerogen and associated bitumen (i.e., primary gas generation). These experimental conditions are below those needed for oil cracking to ensure that generated gas was not derived from the decomposition of expelled oil generated from some of the coals (i.e., secondary gas generation). Experimental results showed that generation of hydrocarbon gas ends before a vitrinite reflectance (R0) of 2.0%. This reflectance is equivalent to Rock-Eval maximum-yield temperature (rmax) and hydrogen indices (HIs) of 555°C (1031°F) and 35 mg/g total organic carbon (TOC), respectively. At these maturity levels, essentially no soluble bitumen is present in the coals before or after hydrous pyrolysis. The equivalent kerogen atomic H/C ratio is 0.50 at the primary gas-generation limit and indicates that no alkyl moieties are remaining to source hydrocarbon gases. The convergence of atomic H/C ratios of type-II and -I kerogen to this same value at a reflectance of 2.0%Ro indicates that the primary gas-generation limits for humic coal and type-Ill kerogen also apply to oil-prone kerogen. Although gas generation from source rocks does not exceed vitrinite reflectance values greater than 2.0%Ro, trapped hydrocarbon gases can remain stable at higher reflectance values. Distinguishing trapped gas from generated gas in hydrous-pyrolysis experiments is readily determined by δ2H of the hydrocarbon gases when a 2H-depleted water is used in the experiments. Water serves as a source of hydrogen in hydrous pyrolysis and, as a result, the use of 2H-depleted water is reflected in the generated gases but not pre-existing trapped gases. Copyright © 2014. The American Association of Petroleum Geologists. All rights reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84922653814&doi=10.1306%2f06021413204&partnerID=40&md5=580838fd6ad24cf2604c7f0787a325af
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/13123
Appears in Collections: 过去全球变化的重建 影响、适应和脆弱性 科学计划与规划 气候变化与战略 全球变化的国际研究计划 气候减缓与适应 气候变化事实与影响
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Recommended Citation:
Lewan M.D.,Kotarba M.J.. Thermal-maturity limit for primary thermogenic-gas generation from humic coals as determined by hydrous pyrolysis[J]. AAPG Bulletin,2014-01-01,98(12)