| 琼东南盆地深水区烃源岩沉积模式及差异热演化 |
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| 引用本文： | 甘军,张迎朝,梁刚,杨希冰,李兴,宋鹏.琼东南盆地深水区烃源岩沉积模式及差异热演化[J].地球科学,2019,44(8):2627-2635. |
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| 作者姓名： | 甘军 张迎朝 梁刚 杨希冰 李兴 宋鹏 |
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| 作者单位： | 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： | “十三五”国家科技重大专项“琼东南盆地深水区大中型气田形成条件及关键勘探技术”2016ZX05026-002 |
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| 摘 要： | 琼东南盆地深水区是目前的天然气勘探热点，但其烃源岩沉积模式和演化特征认识的不足制约了勘探成效.为识别和评价琼东南盆地深水区烃源岩，综合应用地震沉积学、有机地球化学及构造地质学分析方法，对比剖析渐新统含煤三角洲~浅海相泥岩的生烃母质、沉积背景及与已发现油气的对应关系.研究表明，渐新统三角洲的发育规模及古地貌控制了海陆过渡相煤系和海相陆源型烃源岩的分布，断-拗转换期凹凸相间的半封闭浅海环境有利于形成生气为主、油气兼生的渐新统海相陆源型烃源岩；深水区海相陆源型烃源岩分布、热演化及生排烃过程控制了天然气资源潜力，据此对生气凹陷进行分类评价并提出乐东、陵水及松南等Ⅰ类富生气凹陷.
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| 关 键 词： | 海相陆源型烃源岩 沉积模式:凹陷结构 热演化 资源潜力 沉积学 |
| 收稿时间： | 2019-01-11 |
Deposition Pattern and Differential Thermal Evolution of Source Rocks,Deep Water Area of Qiongdongnan Basin |
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| Abstract: | The deep water area of the Qiongdongnan Basin is currently a hot spot for natural gas exploration,but the lack of understanding of sedimentary model、evolution characteristics of the source rocks constrains the exploration results. In order to identify and evaluate source rocks in the deep waters of the Qiongdongnan Basin,Comprehensive application of seismic sedimentology,organic geochemistry and structural geology analysis methods,the parent materials of hydrocarbon and formation settings of the Oligocene-containing coal delta-shallow marine mudstones and their corresponding relationships with the discovered oil and gas are analyzed. The research shows that the distribution of coal-series and terrigenous type dominated marine source rocks controlled by the development scale and paleo-geomorphology of the Oligocene delta,and semi-closed shallow sea environment in the transition period of the fault-depression is conducive to formed the Oligocene terrestrial marine source rocks which are characterized by gas-prone and oil coproduct; The terrigenous type dominated marine source rocks distribution、thermal evolution as well as hydrocarbon generation processes of deep water have controlled the characteristics of natural gas potential. Hereby,gas-prone sags are evaluated by classification and Ledong、Lingshui and Songnan are gas- rich sags of Ⅰtype. |
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