| 张家口下花园青白口系下马岭组灰质页岩热模拟实验 |
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| 引用本文： | 方杰,刘宝泉,郭树之,顾连兴,刘井旺.张家口下花园青白口系下马岭组灰质页岩热模拟实验[J].高校地质学报,2002,8(3):345-355. |
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| 作者姓名： | 方杰 刘宝泉 郭树之 顾连兴 刘井旺 |
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| 作者单位： | 1. 南京大学地球科学系；内生金属矿床成矿机制研究国家重点实验室，江苏南京 210093; 2. 华北油田勘探开发研究院，河北任邱062552 |
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| 摘 要： | 华北地区中上元古界地层烃源岩的有机质热演化普遍处于高成熟－过成熟阶段，而张家口下花园青白口系下马岭组页岩和灰质页岩的Rb仅有0.38-0.6%，处于低成熟阶段，是系统研究中上元古界地层的生烃模式及有机质热演化特征的较理想模拟实验样品。本次模拟结果表明：模拟温度在275℃以前（R0＜0.80%)为低成熟阶段，275℃－350℃（R0为0.8-1.32%）为成熟阶段；其中325℃（R0为1.16%)为生油高峰，350℃（R0为1．32％）为轻质油高峰，350℃－410℃（R0为1．32－2．0％）为高成熟阶段，410℃以后（R0＞2．0％）为过成熟阶段。随着温度升高，生成的烃类和干酪根碳同位素（δ^13)逐渐变重，验证了δ^13C存在温阶效用。在过成熟阶段，可溶有机质亦发生了芳核的缩聚反应，使芳烃含量减少，大分子的沥青质含量增多。可溶有机质在高成熟－过成熟阶段有“逆转”现象，正构烷烃碳数分布出现了双主峰，高碳数部位出现了奇偶优势等特征。当Rb>0.81％以后，同一温度点为Rb%>R0%。无水与加水模拟实验对比表明，加水实验的液态烃产率高，液态烃中重组分相对含量多，说明无水实验中热裂解反应强烈，而加水实验更接近地层热演化条件。
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| 关 键 词： | 热模拟实验 灰质页岩 青白口系 下马岭组 上元古界 张家口 生烃潜力 有机质热演化 烃源岩 |
| 文章编号： | 1006-7493(2002)03-345-11 |
| 修稿时间： | 2002年5月4日 |
Thermal Experiments on Lime-Shale from the Upper Proterozoic Xiamaling Formation at Xiahuayuan, Zhangjiakou |
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| FANG Jie,LIU Bao-quan,QUO Shu-zhi,GU Lian-xing,LIU Jing-wang.Thermal Experiments on Lime-Shale from the Upper Proterozoic Xiamaling Formation at Xiahuayuan, Zhangjiakou[J].Geological Journal of China Universities,2002,8(3):345-355. |
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| Authors: | FANG Jie LIU Bao-quan QUO Shu-zhi GU Lian-xing LIU Jing-wang |
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| Institution: | 1. Department of Earth Sciences, State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093, China; 2. Research Institute of Exploration and Exploitation, Huabei Oil-Field, Renqiu 062552, Hebei in China |
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| Abstract: | Organic matter of most Middle-Upper Proterozoic hydrocarbon sources in northern China has highly evolved to high-maturity or over-maturity stage(Condensate-wet-Methane zone).Shale and lime-shale samples of lower or median maturity(Rb=0.38～0.6％)were selected from the Upper Proterozoic Xiamaling Formation at Xiahuayuan,Zhangjiakou.Simu1ation experiments have been pertormed to study the thermal evolution of the Middle-Upper Proterozoic hydrocarbon sources and to establish a generation mode1.Simulation experiments indicate that simulate temperature of the low-maturity stage is below 275℃ (quite R0 <0.8％),the maturity stage between 275-350℃ (quite R0 0.8～1.32％),High-maturity stage between 350～410℃ (quite R0 1.32-2.0％),and over-maturity stage exceeding 410℃ (quite R0 >2.0％). The higher the simulation temperature,the heavier the carbon isotope( δ13C) of the outcoming hydrocarbon,indicating an effect of temperature on δ13C. Dissolvable aroma-hydrocarbons tend to aggregate at the over-maturity stage,resulting in the reduction of aroma-hydrocarbons and the increase of bitumen.Many characteristics of dissolvable organic matter are reversed at high-maturity and over-maturity stages,such as the appearance of double peaks of normal paraffins, and the predominance of odd-carbon over dual-carbon hydrocarbons.Once Rb exceeds 0.8 1％ as temperature rises,bitumen,litumen neflectance(Rb)will persist to the greater than the vitrinite reflectance at the same temperatures .Compared with water-free runs,water-present experiments will produce liguid hydrocarbons in higher quantities and with more heavy components,indicating that pyrolysis tooks place more intensely during water-free experiments and conditions of water-present runs corresponds better than natusal environments. |
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| Keywords: | pyrolysis experiment lime-shale Xiamaling Formation Upper Proterozoic Zhangj iakou |
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