Abstract Shales in the early maturity and oil window stages contain a considerable amount of heavy hydrocarbons (S2oil) having strong interactions with kerogen/rock that make the accurate measurement of total oil (total extractable organic matter) more difficult from the routine Rock-Eval experiment. In this study, a fast method for evaluating the total oil yield using a single routine Rock-Eval experiment on as-received shales is proposed. First, the temperature threshold (TOK) of the S2oil and cracking hydrocarbons were determined by combining the pyrograms of the as-received shale with a solvent-extracted replicate. Then, the total oil yield was directly derived from the hydrocarbons evaporate at a temperature below than TOK in a routine Rock-Eval experiment. The results show that the TOK value is controlled by the sample’s maturity and pore structure. The higher the maturity, the larger the specific surface area and the smaller the pore size, the greater the TOK. A prediction model of TOK was proposed based on the sample’s production index (PI). The total oil yields estimated by the two methods of both the TOK prediction model and the average TOK value (465 °C) are consistent with those obtained by Jarvie (2012) using the thermal-extraction method with correlation coefficients of 0.983 and 0.9548, respectively. Compared with the previous methods, the single routine Rock-Eval experiment method proposed in this study is convenient and not requires an extraction experiment. In addition, there are archived routine pyrolysis data available that can be used to directly calculate the total oil yield based on the temperature threshold.

中文翻译：

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使用单个常规 Rock-Eval 实验对接收到的页岩评估总石油产量

摘要 处于早熟期和油窗期的页岩含有大量与干酪根/岩石相互作用强的重烃（S2oil），这使得常规 Rock-Eval 实验难以准确测量总油量（总可提取有机质）。 . 在这项研究中，提出了一种使用原始页岩的单一常规 Rock-Eval 实验评估总石油产量的快速方法。首先，S2oil 和裂解烃的温度阈值 (TOK) 是通过将收到的页岩的热解图与溶剂提取的复制品相结合来确定的。然后，在常规 Rock-Eval 实验中，总油产率直接来自在低于 TOK 的温度下蒸发的烃。结果表明，TOK值受样品成熟度和孔隙结构控制。成熟度越高，比表面积越大，孔径越小，TOK越大。提出了基于样本生产指数（PI）的TOK预测模型。TOK预测模型和平均TOK值（465℃）两种方法估算的总油产量与Jarvie（2012）使用热提取法得到的结果一致，相关系数分别为0.983和0.9548 . 与以往的方法相比，本研究提出的单例程 Rock-Eval 实验方法方便，不需要提取实验。此外，