页岩油原地量和可动油量评价方法与应用

Discussion on evaluation method of total oil and movable oil in-place

郭秋麟 王建 陈晓明 陈宁生 吴晓智 柳庄小雪

Qiulin Guo Jian Wang Xiaoming Chen Ningsheng Chen Xiaozhi Wu Zhuangxiaoxue Liu

页岩总油含量（）和可动油含量（）的计算是页岩油资源潜力评价的核心技术。根据对两次热解样品总有机碳含量（）非均质性的认识，提出了一种基于两次热解数据来评价样品含量非均质性的方法及一种校正吸附油含量的计算方法，并运用该方法对江汉盆地29个潜江组页岩样品和渤海湾盆地32个沙河街组页岩样品进行评价，结果显示：①含量偏差平均值分别达到0.16%和0.34%，说明两组样品都存在一定的非均质性；②校正前、后吸附油含量的差值分别为0.85 mg/g和0.84 mg/g，说明进行等价校正可以使吸附油含量、总油含量和可动油含量的计算结果更准确。同时，提出了一种基于页岩油密度及地层体积系数计算蒸发烃损失量的方法。采用以上新方法对鄂尔多斯盆地延长组7油层组（长7油层组）页岩油进行评价，结果显示：①吸附油含量占总油含量的63%，可动油含量占总油含量的37%，总油含量是游离烃量（）的3.5倍，蒸发烃损失量约占总烃含量的9%，占含量的29%；②长7油层组页岩油原地量为111.2×10 t，可动油量为40.1×10 t，说明长7油层组页岩油勘探潜力大。

The calculation of total oil yield () and movable oil yield () of shale is a core technology in assessing shale oil resource potential. A method of evaluating the heterogeneity of content in shale samples and a calculation method to correct the content of adsorbed oil are proposed based on data of two separate pyrolysis experiments. The calculation method is subsequently applied to evaluate 29 shale samples from the Qianjiang Formation in the Jianghan Basin and 32 shale samples from the Shahejie Formation in the Bohai Bay Basin, and the results show that: (1) The mean deviations of are 0.16% and 0.34%, respectively, indicating heterogeneity of the two sample groups; (2) The adsorbed oil content deviations of pre-and post-correction are 0.85 mg/g and 0.84 mg/g respectively, showing that the equivalent correction can lead to more accurate results in calculating adsorbed oil, and . Besides, a method to calculate evaporative hydrocarbon loss is proposed based on shale oil density and formation oil volume factor. These newly proposed methods are used to evaluate the 7 shale oil layer group of Yanchang Formation (Chang 7 shale oil layer group) in the Ordos Basin. The results are as follows: (1) Adsorbed oil accounts for 63% of the , the accounts for 37% of the , the is 3.5 times of , and the evaporative hydrocarbon loss accounts for 9% of the and 29% of ; (2) The shale oil in-place is 111.2×10t and the movable oil in-place is 40.1×10t in the study area, indicating that the Chang 7 shale oil layer group is of great exploration potential.

10.11743/ogg20210619