Experimental study to confirm the existence of hydrocarbon under high pressure and temperature of deep lithosphere  

作　　者：WANG Chuanyuan DU Jianguo WANG Wanchun XIE Hongsen CHEN Guojun DUAN Yi ZHOU Xiaocheng 

机构地区：[1]Center for Analysis and Prediction, China Earthquake Administration, Beijing 100036, China [2]Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000, China [3]Graduate School, Chinese Academy of Sciences, Beijing 100049, China [4]Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China

出　　处：《Chinese Science Bulletin》2006年第13期1633-1638,共6页

基　　金：supported by the National Natural Science Foundation of China(Grant No.10299040);the Innovation Fund of Lanzhou Institute of Geology,Chinese Academy of Sciences(2003-19-DJG);Important Project of Bureau of International Co-operation,Chinese Academy of Sciences(GJHZ05).

摘　　要：Pyrolysis of lignite was conducted at high temperatures from 400 to 700℃ and high pres- sures of 1 and 3 GPa in a closed system in order to investigate pressure and temperature effects on or- ganic matter maturation. The data indicated that the total yield of liquid hydrocarbons decreased with increasing pressure and the maximum of production was obtained at a higher temperature. The alkanes show more mature characteristics with increasing temperature at a given pressure, conversely, high pressure significantly hinders the thermal evolution of geological organic matter. The experimental results also demonstrated that the relative abundance of high molecular weight hydrocarbons may exist under the conditions of the lower lithosphere, which not only breaks through the traditional concept that alkanes mainly present at stage of “oil window”, but also en- hances the possibility to find the oil in the high tem- perature and pressure areas.Pyrolysis of lignite was conducted at high temperatures from 400 to 700℃ and high pressures of 1 and 3 GPa in a closed system in order to investigate pressure and temperature effects on organic matter maturation. The data indicated that the total yield of liquid hydrocarbons decreased with increasing pressure and the maximum of production was obtained at a higher temperature. The alkanes show more mature characteristics with increasing temperature at a given pressure, conversely, high pressure significantly hinders the thermal evolution of geological organic matter. The experimental results also demonstrated that the relative abundance of high molecular weight hydrocarbons may exist under the conditions of the lower lithosphere, which not only breaks through the traditional concept that alkanes mainly present at stage of ＂oil window＂, but also enhances the possibility to find the oil in the high temperature and pressure areas.

关 键 词：高温高压 褐煤 烷烃 熟化 异构化 

分 类 号：TQ531[化学工程—煤化学工程]