The Comparision of Gas Generation Potential and Model between Two Different Thermal Simulation Systems
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摘要: 对海相Ⅱ1型有机质在封闭体系和开放体系下开展了产气率热模拟实验,并对其在两种体系下的产气率和生气模式进行了对比研究。在开放体系下,样品产气率较低,Ⅱ1型有机质产气率为84.2m3/吨·TOC,但在封闭体系下实验热模拟产气率很高,Ⅱ1型有机质产气率可达371.2m3/吨.TOC;在开放体系下Ⅱ1型有机质大量生气阶段R o为1.0%～1.5%之间,在封闭体系下Ⅱ1型有机质大量生气阶段在R o在1.5%～2.5%之间。在不同实验体系下有机质产气率和生气模式的差异主要与有机质的生气机理有关,在开放体系下有机质主要为干酪根裂解气,而在封闭体系下有机质生成的天然气为原油和干酪根裂解的混合气。Abstract: The gas potential and generation model of type Ⅰ,Ⅱ 1,Ⅱ 2 and Ⅲ organic matter in the open system have been studied. The thermal simulations with type Ⅱ 1 organic matter in the open and closed pyrolysis systems have been carried out and gas generation potential and model have been compared in the two kinds of systems. In the open system the gas potential from type Ⅰ is the highest and its potential is about 269.6 l/g·C org . The gas potential from type Ⅲ is the lowest and its potential is only 26.3 l/g · C org . The gas potential from type Ⅱ 1 in the closed system is more than that in the open system. In the closed system the gas potential is up to 371.2 l/g·C org ., which is about 4.4 times higher than that in the open system. This means that the cracking mechanisms are not different in these two kinds of pyrolysis systems. In the open system, the gas is mainly generated from kerogen by primary cracking, but in the closed system it is generated from kerogen and liquid hydrocarbon by primary and secondary cracking. The gas generation model from type Ⅱ 1 is different in this two kinds of cracking process. The main evolution stage of gas generation by primary cracking (from kerogen) is from R o(%)=1.0 to 1.5 and that by secondary cracking (from liquid hydrocarbon) is from R o(%)=1.5 to 2.5.
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Key words:
- simulation /
- open system /
- closed system /
- cracking /
- gas generating model
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