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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[1] Solomon P R,Hamblen D G. Analytical pyrolysis of coal using Ft-Ir.In: Voorhees K J,ed.Analytical Pyrolysis: Techniques and Applications. London: Butterworths,1984. 121～158 [2] Tang, et al. Multiple cold trap pyrolysis gas chromatography:a new technique for modeling hydrocarbon generation.Organic Geochemistry,1994,22: 863-872 [3] 程克明. 烃源岩产烃潜力的热压模拟实验及其在油气勘探中的应用. 石油勘探与开发,1991,18(5):1～11 [Cheng Keming. The gas generating simulation experiment and its application in oil and gas exploration. Petroleum Exploration and Development, 1991,18(5): 1～11] [4] 郝石生,高岗,王飞宇, 等. 高过成熟海相烃源岩. 北京:石油工业出版社,1996 [Hao Shisheng, Gao Gang, Wang Feiyu, et al. High and post mature source rock in marine environment. Beijing: Petroleum Industry Press, 1996] [5] 刘宝泉,秦建中,于国营, 等. 碳酸盐岩和泥岩的排烃下限值研究. 有机地球化学研究新进展. 北京:石油工业出版社,2002 [Liu Baoquan, Qing Jianzhong, Yu Guoying, et al. Expulsion window value of hydrocarbon in carbonate rock and mud rock, The advance study of organic geochemistry in China. Beijing: Petroleum Industry Press, 2002] [6] 马素萍,贺建桥,汤渭, 等. 高压釜对加水模拟实验中氢产物的影响. 沉积学报,2003,14(4): 713～716 [Ma Suping, Huo Jianqiao, Tang Wei, et al. The influence of high-pressure autoclave on hydrogen product during hydrous simulation experiment. Acta Sedimentologica Sinica, 2003, 14(4): 713～716] [7] Behar F,Vandenbroucke M. Experimental simulation of gas generation from coals and a marine kerogen. Chemical Geology, 1995,126: 247～260 [8] Behar F, Vandenbroucke M. Thermal cracking of kerogen in open and closed systems:determination of kinetic parameters and stoichiometric coefficients for oil and gas generation.Organic Geochemistry, 1997, 26 (5/6): 321～339 -
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