摘要
通过对塔里木盆地满加尔凹陷侏罗系演化程度较低的(RO=0.40%)煤岩和煤岩加水进行了从250～550℃(50℃为一温阶,恒温72h)的热模拟实验,用氯仿抽提获得了赋存在固体残余物中的可溶液态有机物,即饱和烃、芳烃和非烃。实验结果表明:煤岩在各演化阶段的液态物产率均低于煤岩原样;饱和烃随演化程度升高逐步增加,而芳烃减少,反映出非烃沥青质,甚至不溶有机质向相对稳定的饱和烃转化以及芳烃随演化程度升高的高聚合作用;沥青质随演化程度升高亦有增大的趋势,而非烃比例变化不大,反映出高温下非烃向饱和烃和沥青质转化的两极分化作用;烷/芳值随着演化程度的升高而增加,反映出高演化期芳烃的聚合作用。在煤岩加水热模拟实验中,液态烃产率随温度升高而逐步增加且芳烃是主体产物。在实验的低温阶段,水的加入使得煤岩样中可溶有机质向气态和不溶有机质转化,从而使得可溶有机质组分呈降低趋势,而在高温阶段时煤岩加水后可溶有机质有所增加。在煤岩加水热模拟实验中,烷/芳值均小于1,再一次说明了水对芳烃缩聚的抑制作用及对烷烃形成的促进作用。
Low-mature coal and the coal added water (R_O=0.40%, from Manjia'er depression, Tarim basin, China) were subjected to closed system pyrolysis, in sealed gold tubes, under isothermal temperature conditions, ranging from 250 to 550℃ at temperature intervals of 50℃ (pyrolysis time 72 hours). The soluble organic matters in the pyrolysis remainders were obtained by the chloroform extraction, including saturated hydrocarbon, aromatics and non-hydrocarbons. The result shows that the liquid products for pyrolysis coal in different ranks are less than the product of the coal that was not heated. The amount of saturated hydrocarbon increased but the aromatics decreased with the evolution. This phenomenon shows that the non-hydrocarbon, even the bitumen, would transfer the saturated hydrocarbon, moreover the aromatics went through the ployaromatic. The outcome that the bitumen would increase with the evolution, but the non-hydrocarbon forming rate less variable, indicates that the non-hydrocarbon would transfer the saturated hydrocarbon and bitumen at high rank coal. The ratios of alkanes and aromatics increase with the high rank coal, this result indicated the ployaromatic at the high rank. The amount of the liquid products of coal added water increased, the aromatics as a principal part, with thermal evolution. The soluble organic matters would transfer gaseous product and insoluble substance for the coal added water at low temperature so that the soluble organic substances show the decrease, however at high temperature the soluble matters present the increase. Every ratio of alkanes and aromatics at the different ranks is less than one; this result presents the inhibition of water for aromatic condensate and the speed of alkanes form.
出处
《天然气地球科学》
EI
CAS
CSCD
2004年第4期355-359,共5页
Natural Gas Geoscience
基金
国家"973"项目"鉴别混源气和示踪成藏过程的地球化学理论基础与新指标开发"(编号:2001CB209102)资助.
关键词
塔里木盆地
煤岩
热模拟实验
液态烃
Tarim basin
Coal
Thermal pyrolysis experiment
Liquid hydrocarbon.
