Study on Oil-prone and Gas-prone Property of Coal-measure Source Rocks
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摘要: 利用固体13C核磁共振波谱检测源岩干酪根中油、气潜力碳的相对含量,并利用该参数直接判别各类源岩在“液态窗”阶段的倾油、倾气性。有些煤系源岩虽然其地球化学特征属腐植型母质,但由于其干酪根的脂碳中油潜力碳>气潜力碳,故仍以生油为主。该方法从生烃机理出发进一步揭示了新疆焉耆盆地中、下侏罗统煤系源岩以生油为主的根本原因。
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关键词:
- 固体13C核磁共振波谱 /
- 油潜力碳 /
- 气潜力碳 /
- 焉耆盆地
Abstract: Relative content of oil-prone carbon (Co) and gas-prone carbon (Cg) in kerogen are detected using solid-state 13C nuclear magnetic resonance spectra analysis. Co and Cg can be used to directly distinguish whether source rocks tend to generate oil or gas during "liquid hydrocarbon window". Although the kerogen of coal-measure source rock is characteristic of predominant humic type, Co is more than Cg among aliphatic carbon of the kerogen, so the source rocks still tend to generate oil. According to relative content of Co and Cg from solid state 13C nuclear magnetic resonance spectra analysis, the paper answers why Middle-Lower Jurassic coal-measure source rock of Xinjiang Yanqi basin tend to generate oil based on the mechanisms of hydrocarbon generation.-
Key words:
- solid-state /
- 13C /
- nuclear magnetic resonance spectra /
- oil-prone carbon
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