Deep thermal state and hydrocarbon accumulation potential of Cenozoic sedimentary basins in East China: a case study of Subei-South Yellow Sea basin
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摘要: 中国东部新生代盆地有一个值得关注的现象:裂后热沉降量大小与油气资源贫富之间存在密切的相关性。为探究这一现象潜在的成因机制,探讨沉积盆地深部热地质作用与油气富集分布的相关性,以磁异常反演的居里面深度作为沉积盆地深部热状态一级约束,建立其与干酪根裂解的油气生成反应速度之间的定量关系,并以苏北—南黄海盆地为例证,揭示了沉积盆地烃源岩有机质生烃与深部热状态之间具有显著的正相关性。该认识有助于更好地理解沉积盆地构造—热体制与生烃过程,可为油气成藏规律与资源潜力评价提供研究新视角。Abstract: A remarkable phenomenon of the Cenozoic basins in East China is that there is a close correlation between the amount of post-rift thermal subsidence and the petroleum resources. In order to explore the underlying mechanism of this phenomenon and the correlation between deep thermal processes of sedimentary basins and the distribution of oil and gas resources, this paper takes the Curie interface depth estimated by the magnetic data as the first-order constraint for the deep thermal state to determine the quantitative relationship between it and the reaction rate of hydrocarbon generation from the cracking of kerogen. Moreover, the Subei-South Yellow Sea basin is an example of the outstanding positive correlation between hydrocarbon generation from source rocks and the deep thermal state, which could help to understand the tectonic-thermal system of sedimentary basin and hydrocarbon generation process, and offer a new research perspective for hydrocarbon accumulation and evaluation of petroleum potential.
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Key words:
- sedimentary basin /
- thermal state /
- petroleum potential /
- Subei-South Yellow Sea basin /
- East China
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图 1 中国东部新生代沉积盆地的空间展布与油气地质特征
a.油气田分布位置[2],NSGL.重力梯度带,BHB.渤海湾盆地,NYSB.北黄海盆地,LYRB.下扬子伸展盆地,JHB.江汉盆地,ECSB.东海盆地,SWTB.台西南盆地,PRMB.珠江口盆地,QDNB.琼东南盆地,YGHB.莺歌海盆地;b.下扬子伸展盆地(苏北—南黄海);c.渤海湾盆地;d.琼东南盆地;e.莺歌海盆地[3-10]
Figure 1. Spatial distribution and petroleum geological features of Cenozoic sedimentary basins in East China
图 2 下扬子区苏北—南黄海盆地构造
构造单元注释:SKB.中朝块体;LYB.下扬子块体;SCB.华南块体;SLO.苏鲁造山带;DBO.大别造山带;JLO.九岭造山带;JNO.江南造山带;NSYSB.南黄海北部盆地;SSSYSB.苏北—南黄海南部盆地;LYFBS.下扬子断陷盆地系统;YJBS.沿江盆地群棕色区域为下扬子区新生代盆地凸起,黄色区域为下扬子区新生代伸展断陷;黑色实线为断裂单元,红色色块为油气田,彩色圆点为热流值数据点[17, 20-25]。HF为地表热流值,TOPO为地形。
Figure 2. Structural framework of Subei-South Yellow Sea basin in Lower Yangtze region
图 4 下扬子区居里面与油气田关系
a.下扬子区总磁△T异常图;b.下扬子区居里面深度数字地形图;c.下扬子区居里面深度立体阴影图;d.下扬子区居里面等值线与油气田分布图。居里面深度数据来源于李春峰等[30]
Figure 4. Correlation between Curie surface and oil-gas fields across the Lower Yangtze region
表 1 中国东部新生代盆地热状态特征与油气资源潜力[6-10]
Table 1. Thermal state and petroleum potential of Cenozoic basins in East China
盆地 烃源岩 热场 最大埋深/m 大地位置 形成机制 成因类型 勘探潜力 苏北—南黄海 湖相泥岩,0.4%<Ro < 2% 温盆 7 000 大陆内缘 侧向伸展 被动 中等油气 渤海湾 深湖盆泥岩,0.3%<Ro < 3% 热盆 10 000 大陆内缘 走滑拉分+幔隆 被动+主动 特富油气 东海 海陆过渡相泥岩,Ro>2% 热盆 18 000 大陆外缘 弧后伸展 主动 特富油气 莺歌海 海陆过渡相泥岩,Ro>4% 超热盆 17 000 大陆外缘 走滑拉分 被动+主动 特富油气 -
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