| 南海北部深水盆地沉积-构造的差异性及其油气意义 |
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| 引用本文： | 吕宝凤,袁亚娟.南海北部深水盆地沉积-构造的差异性及其油气意义[J].大地构造与成矿学,2008,32(4). |
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| 作者姓名： | 吕宝凤 袁亚娟 |
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| 作者单位： | 中国科学院广州地球化学研究所,中国科学院边缘海地质重点实验室,广东,广州,510640 |
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| 基金项目： | 中国科学院知识创新工程重要方向项目
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| 摘 要： | 南海北部深水区自西向东依次分布着琼东南盆地、珠江口盆地、台西南盆地等新生代被动陆缘盆地,这些盆地经历了大致相当的从裂陷到坳陷的构造演化史,但在张裂活动过程中存在着明显的沉积-构造的差异性。构造沉降特征分析显示:在同一构造带上自西向东有盆地主要构造沉降发生的时段逐步变晚的趋势;在不同构造带上自北向南有盆地主要构造沉降发生的时段逐步变晚的趋势。这种沉积-构造的差异性对烃源岩的发育类型、分布及生储盖组合等方面有明显的控制作用,表现为:裂谷期构造沉降幅度大的盆地,陆相烃源岩发育,以陆生陆储陆盖型成藏组合为主;裂后期构造沉降幅度大的盆地,海相烃源岩发育规模较大,海生海储海盖型成藏组合及混生海储海盖型生储盖组合所占分量逐渐增多。推测渐新统湖相-湖沼相及海陆过渡相源岩和中新统海相烃源岩应是南海北部深水区油气的主要来源,陆生海储海盖型、海生海储海盖型及混生海储海盖型生储盖组合应是深水区基本生储盖组合类型。
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| 关 键 词： | 南海北部 深水盆地 沉积-构造差异 生储盖组合 |
THE SEDIMENTARY-STRUCTURE DIFFERENCE OF DEEP WATER BASINS AND ITS PETROLEUM SIGNIFICANCE IN THE NORTHERN SOUTH CHINA SEA |
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| LV Baofeng,YUAN Yajuan.THE SEDIMENTARY-STRUCTURE DIFFERENCE OF DEEP WATER BASINS AND ITS PETROLEUM SIGNIFICANCE IN THE NORTHERN SOUTH CHINA SEA[J].Geotectonica et Metallogenia,2008,32(4). |
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| Authors: | LV Baofeng YUAN Yajuan |
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| Abstract: | There are many Cenozoic passive continental margin petroliferous basins in deep water area in the northern South China Sea.From west to east,they are Qiongdongnan basin,Zhujiangkou basin,and Taixinan basin.Though they all experienced similar history from rift stage to saging stage controlled by subduction of Pacific plate beneath the Eurasian continent and collision between Indian plate and Asian continent,the sedimentary-structure difference is very obviously.The data of tectonic subsidence analysis indicate that:in the same latitudinal structure belt,the time of tectonic subsidence is later eastward;in the different structure belt,the time of tectonic subsidence is later from north to south.These difference deeply influenced the type,the location of sourcerock and the type of source-reservoir-caprock assemblage.In other words,the basins with biger amplitude of tectonic subsidence within rift stage have more continental source rock and continental source-continental reservoir-continental caprock assemblage,but those basins with bigger amplitude of tectonic subsidence during saging stage have more marine source rock and marine source-marine reservoir-marine caprock assemblage.Petroleum of deep water basins possibly generated from the Oligocence limnetic and continental-oceanic source rock,the marine source-oceanic reservoir-marine caprock assemblage and the composite source-marine reservoir-marine caprock assemblage may be the main source-reservoir-caprock assemblages. |
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| Keywords: | Northern South China Sea deep water basin sedimentary-structure difference source-reservoir-caprock assemblage |
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