烃源岩有限空间热解生油气潜力定量评价研究

Quantitative evaluation of hydrocarbon yielding potential of source rock: application of pyrolysis in finite space

利用无锡石油地质研究所研制的地层孔隙热压生排烃模拟仪,选用泌阳凹陷核三段未成熟深灰色泥岩,采用分温阶连续递进有限空间热压生烃模拟实验方法,获得了Ⅱ1干酪根在不同成熟时期的阶段与累计生油、生气与生烃产率。通过与开放体系的Rock-Eval热解生烃动力学对比研究,首次建立了一套在有限空间条件下烃源岩生油气潜力评价方法,提出了以下干酪根生烃潜力评价参数:①残留油潜量与指数;②干酪根生油潜量与指数;③干酪根生气潜量与指数;④干酪根总生烃潜量与指数;⑤最大生油温度与反射率、最大生气温度与反射率及最高生烃温度与反射率。借助这些生烃评价指标能定量评价干酪根在某个演化阶段生"油"、生"烃气"和生烃潜力,描述其生油气过程。

With the formation porosity thermocompression simulation experiment instrument designed by Wuxi Research Institute of Petroleum Geology,immature perse mudstones from the 3rd member of Hetaoyuan Formation in the Biyang Sag were pyrolyzed in finite space and with phased,continuous and progressive temperature.The stage and total product rates of oil,gas and total hydrocarbon of type Ⅱ1 kerogen during different evolution stages were calculated.Comparison was made between the above-mentioned method and the conventional open-system Rock-Eval experiment.A new evaluation method to study hydrocarbon generation potential in finite space was put forward.The following parameters were used to judge the hydrocarbon generation potential of kerogen.1） Residual oil potential and index.2） Oil generation potential and index of kerogen.3） Gas generation potential and index of kerogen.4） Total hydrocarbon generation potential and index of kerogen.5） Maximum temperatures for oil,gas and total hydrocarbon generation and reflectance.Quantitative evaluation of oil,gas and total hydrocarbon generation potential of kerogen during certain stage was made,and the generation process was described using the parameters.