| 江汉盆地潜江凹陷盐间云质页岩热压生排烃模拟实验研究 |
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| 引用本文： | 潘银华,黎茂稳,孙永革,李志明,李璐赟,廖玉宏.江汉盆地潜江凹陷盐间云质页岩热压生排烃模拟实验研究[J].石油实验地质,2018,40(4):551-558. |
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| 作者姓名： | 潘银华 黎茂稳 孙永革 李志明 李璐赟 廖玉宏 |
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| 作者单位： | 1. 浙江大学 地球科学系, 杭州 310027; |
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| 基金项目： | 国家重点基础研究发展计划（973计划）（2014CB239101）、有机地球化学国家重点实验室开放基金（SKLOG-201601）和中国科学院战略性先导科技专项（B类）子课题（XDB10010301）共同资助。 |
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| 摘 要： | 江汉盆地潜江凹陷盐间云质页岩具有形成规模页岩油资源的潜力。通过对潜江组未熟的云质页岩烃源岩样品开展热压生排烃模拟实验，定量分析了不同热成熟度烃源岩有机质的生烃产率，并探讨了盐间云质页岩的生排烃过程。此外，将由总排烃量计算获得的转化率作为热成熟度的标尺，分析了排出油和烃气组成随热成熟度的变化。研究结果显示，残留油和排出油之间存在明显的"前驱体-产物"关系，反映了有机质生油过程为"干酪根→沥青→原油"两步同时进行的转化过程。由总排烃量计算获得的转化率与EasyRo之间服从较严格的玻尔兹曼分布，可用于描述生油窗内烃源岩的排烃行为。当转化率在0~25%之间时，排出油各族组分相对含量变化较小；而当转化率在25%~100%之间时，排出油沥青质组分的相对含量迅速减少而饱和烃和芳烃组分明显增加，说明干酪根裂解形成的沥青（即残留油）是排出油中烃类逐渐富集的主要物质来源；与此同时，形成更多的小分子烃类改善了烃类流体的流动性，排烃作用相应增强，导致排出油产率在该阶段快速增加。
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| 关 键 词： | 盐间云质页岩 生排烃模拟实验 生烃产率 转化率 排出油 |
| 收稿时间： | 2017-09-13 |
Thermo-compression simulation of hydrocarbon generation and expulsion of inter-salt dolomitic shale,Qianjiang Sag,Jianghan Basin |
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| Abstract: | The inter-salt dolomitic shales in the Qianjiang Sag of Jianghan Basin have a potential to form considerable amounts of shale oil resources. The study on the thermal evolution of inter-salt dolomitic shales plays an important guiding role on shale oil resource evaluation as well as oil exploration and development. A thermo-compression simulation of hydrocarbon generation and expulsion was performed with an immature dolomitic shale source rock from the Qianjiang Formation. The quantitative yields of the products generated from source rocks with an increasing thermal maturity were calculated to explore the hydrocarbon generation and expulsion of inter-salt dolomitic shales. The results showed that there is a precursor-product relationship between residual oil and expelled oil, suggesting that oil generation is a simultaneous two-step process, namely kerogen→bitumen→oil. A strict Boltzmann distribution was observed between TR and EasyRo value in this study, which can be used as a method to describe hydrocarbon expulsion during maturation within the oil window. Within a TR range of 0-25%, the contents of group fractions of expelled oil show slight changes. However, within a TR range of 25%-100%, the content of asphaltene fraction rapidly decreases while the contents of both saturated and aromatic fractions increase significantly. This indicated that bitumen is the main source of saturated and aromatic hydrocarbons that are gradually enriched in expelled oil. Meanwhile, the generated light hydrocarbons improve the liquidity of hydrocarbon fluid and thus enhance hydrocarbon expulsion, which results in a rapid increase in the product yield of expelled oil in this stage. |
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