摘要
丝质体是煤中的主要组分之一 ,其在煤中含量的多少、生烃潜力的大小、生烃特性等直接影响煤成烃资源的评价。本文采用岩石热解、热解气相色谱以及开放体系下热模拟等方法 ,对山西繁峙老第三纪 (E3)煤中丝质体的生烃潜力、烃类组成特征、成烃演化规律进行了研究 ,并与贵州水城晚二叠世 (P2 1 )含树皮体煤中的主要组分 -树皮体进行比较。结果表明 :丝质体的生烃潜力、氢指数 (2 6 .18m g/ g、35 mg/ g· TOC)远低于树皮体的生烃潜力、氢指数 (2 97mg/ g、491mg/ g· TOC) ;丝质体有两个生烃高峰 ,所对应的 VR0 (% )分别为 1.1%和 2 .0 % ;丝质体产烃范围较宽 ,从 2 0 0℃可以延续到 6 0 0℃ ,甚至超过6 0 0℃还有少量的烃类物质生成 ;丝质体的烃类组成以轻质烃为主 。
Fusinite is one of the major macerals of coals. The hydrocarbon-generation potential and the amount of fusinite can influence the evaluation of oils and gases from coal. In this paper, Rock-Eval and Py-Gc were used to study the hydrocarbon-generation potential, the hydrocarbon composition, hydrocarbon-generation mechanism and thermoevolutional characteristics of fusinite from Tertiary Period coals in Fanshi basin, Shanxi Province. The results indicate that fusinite has lower hydrocarbon-generation potential and hydrocarbon index; light hydrocarbon and wet gas are the main composition of hydrocarbon; fusinite has two hydrocarbon generation peak, one is at 420℃~450℃(VR0 is 1.1%), another is at 450℃~500℃(VR0 is 2.0%); the temperature range of hydrocarbon producting of fusinite is wider than that for barkinite, this characteristic is unfavourable for hydrocarbon gathering from coal etc. In one word, fusinite has fewer contribution to hydrocarbon from coal.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第2期256-260,共5页
Acta Petrologica Sinica
基金
国家自然科学基金项目! (49672 13 1)
关键词
丝质体
生烃潜力
烃类组成
煤
油气成因
Fusinite, Hydrocarbon-generation potential, Hydrocarbon composition, Hydrocarbon-generation model