| 琼东南盆地深水区烃源岩地球化学特征和生烃潜力评价 |
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| 作者姓名： | 李金帅 李贤庆 王元 王刚 徐新德 刘海钰 |
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| 作者单位： | 煤炭资源与安全开采国家重点实验室,北京 100083;中国矿业大学(北京)地球科学与测绘工程学院,北京 100083;中海石油(中国)有限公司湛江分公司,广东湛江 524057 |
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| 基金项目： | 国家科技重大专项2016ZX05007-003中央高校基本科研业务费专项资金2020YJSMT02中海石油(中国)有限公司湛江分公司资助项目GC-2016-ZC-2073 |
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| 摘 要： | 琼东南盆地深水区勘探程度低，对该区海陆过渡相与海相烃源岩生烃潜力评价研究，关系到该区下一步油气勘探方向。通过有机碳含量(TOC)测定、岩石热解分析、显微组分镜鉴、镜质体反射率(Ro)测试等实验分析，系统剖析了琼东南盆地深水区不同类型烃源岩的地球化学特征、生烃潜力。结果表明:琼东南盆地深水区烃源岩有机质丰度以崖城组最高，TOC均值1.37 %；陵水组和三亚组次之，TOC均值分别为0.91 % 和0.99 %；梅山组相对较低，TOC均值0.78 %。有机质热演化程度渐新统主要为成熟阶段，中新统主要为低成熟—成熟阶段。有机质类型渐新统以Ⅲ型为主、部分Ⅱ2型，中新统以Ⅱ2型和Ⅲ型为主。综合评价表明，崖城组为中等—好烃源岩，生烃潜力较强；陵水组和三亚组为中等烃源岩，生烃潜力相对较好。
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| 关 键 词： | 烃源岩 地球化学特征 生烃潜力 深水区 琼东南盆地 |
| 收稿时间： | 2020-09-10 |
Geochemical characteristics and hydrocarbon generation potential evaluation of source rocks in the deepwater area of Qiongdongnan Basin |
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| Affiliation: | 1.State Key Laboratory of Coal Resources and Safe Mining, Beijing 100083, China2.College of Geoscience and Surveying Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China3.Zhanjiang Branch, CNOOC Ltd., Zhanjiang Guangdong 524057, China |
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| Abstract: | The deep-water area of Qiongdongnan Basin has a low degree of exploration.The evaluation of and research on the hydrocarbon generation potential of the marine-terrestrial transitional and marine source rocks in this area is related to the future direction of oil and gas exploration.Through organic carbon content(TOC)determination, rock pyrolysis analysis, microscopic composition identification, vitrinite reflectance(Ro) test and other experimental analysis, this paper systematically analyzes the geochemical characteristics and hydrocarbon generation potential of different types of source rocks in the deep water area of Qiongdongnan Basin.The results show that the source rock organic matter abundance in the deepwater area of Qiongdongnan Basin is the highest in the Yacheng Formation, with an average TOC of 1.37 %; the Lingshui Formation and Sanya Formation rank the second, with an average TOC of 0.91 % and 0.99 %; the Meishan group is relatively low, with an average TOC of 0.78 %.The degree of thermal evolution of organic matter is mainly in the mature stage of Oligocene, and the Miocene is mainly in the low-mature-mature stage.Organic matter types are mainly type Ⅲ in Oligocene, some are type Ⅱ2, and Miocene are mainly type Ⅱ2 and type Ⅲ.Comprehensive evaluation shows that the Yacheng Formation is a medium to good source rock with strong hydrocarbon generation potential; the Lingshui Formation and Sanya Formation are medium source rocks with relatively good hydrocarbon generation potential. |
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