罗纪源岩中的碳化合物生成潜力来自于在超深层条件下的性热解实验
Zhanyuan Cao1,2, Mingliang Liang3, Xilong Zhang1,2
1Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China.
Scientific reports
|September 27, 2024
概括
罗纪源岩甚至在超深的条件下也保留了碳化合物潜力. 高压延迟碳化合物生成,允许液态石油和天然气的形成,即使在过度成熟的阶段,对于未来的勘探至关重要.
科学领域:
- 地质化学 地质化学
- 石油地质学 石油地质学
- 有机地化学 有机地化学
背景情况:
- 在极端条件下的罗纪源岩中了解碳化合物生成对于能源勘探至关重要.
- 之前的研究往往集中在较浅的深度,使得超深潜力未被充分探索.
研究的目的:
- 在模拟的超深地质条件下调查罗纪源岩的碳化合物生成潜力.
- 确定温度,压力,石质学和煤化物类型对碳化合物产量和排放的影响.
主要方法:
- 半封闭系统的水性热解实验在四种石材 (页岩,泥石,碳酸泥石,煤炭) 上进行,其中包括I,II和III类的煤化物.
- 实验涵盖了250-650°C的温度和34-100 MPa的流体压力.
主要成果:
- 观察到石油产量的双模分布,峰值在350°C和600°C左右.
- 第三种类型的二氧化碳岩石显示出更高的石油和天然气生产率,而第一种类型和第二种类型的二氧化碳岩石更高碳水化合物效率.
- 在500°C以上,石油排放量超过99%,排出的石油富含非碳化合物和青素.
- 高过压 (>70 MPa) 显著延迟了碳化合物生成峰值,在过度成熟的源岩中保留了液态碳化合物的潜力.
结论:
- 罗纪源岩在超深的条件下 (深度>6000米) 具有显著的碳化合物潜力.
- 持续的高流体过压是保持过成熟源岩中的液态碳化合物生成潜力的关键.
- 这些发现扩展了碳化合物形成的热边界理论,并指导了超深探测策略.
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