| 万安盆地中部坳陷——一个巨大的富生烃坳陷 |
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| 引用本文： | 金庆焕,刘振湖,陈强.万安盆地中部坳陷——一个巨大的富生烃坳陷[J].地球科学,2004,29(5):525-530. |
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| 作者姓名： | 金庆焕 刘振湖 陈强 |
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| 作者单位： | 国土资源部广州海洋地质调查局, 广东广州 510760 |
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| 基金项目： | 国土资源部南沙油气勘查专项基金，93-517， |
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| 摘 要： | 万安盆地位于万安断裂西侧, 是一个大型的走滑拉张盆地.其中部坳陷为富生烃坳陷, 发育有渐新统湖沼相、海湾相泥岩和下中新统浅海相泥岩2套主要烃源岩, 渐新统烃源岩具有良好的生烃潜力, 下中新统烃源岩次之.万安盆地的油气藏主要分布于中部坳陷及其相邻的西北断阶带、北部隆起和中部隆起, 而在北部坳陷、南部坳陷和东部隆起上仅见油气显示.研究表明, 万安盆地这种油气分布特征明显地受中部富生烃坳陷所控制.
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| 关 键 词： | 中部坳陷 生烃潜力 油气分布 万安盆地 |
| 文章编号： | 1000-2383(2004)05-0525-06 |
| 收稿时间： | 2004-06-05 |
The Central Depression of the Wan'an Basin, South China Sea:A Giant Abundant Hydrocarbon-Generating Depression |
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| JIN Qing-huan,LIU Zhen-hu,CHEN Qiang Guangzhou Marine Geological Survey Bureau,Ministry of Land and Resources,Guangzhou,China.The Central Depression of the Wan'an Basin, South China Sea:A Giant Abundant Hydrocarbon-Generating Depression[J].Earth Science-Journal of China University of Geosciences,2004,29(5):525-530. |
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| Authors: | JIN Qing-huan LIU Zhen-hu CHEN Qiang Guangzhou Marine Geological Survey Bureau Ministry of Land and Resources Guangzhou China |
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| Institution: | JIN Qing-huan,LIU Zhen-hu,CHEN Qiang Guangzhou Marine Geological Survey Bureau,Ministry of Land and Resources,Guangzhou510760,China |
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| Abstract: | The Wan'an basin, located in the southwestern part of the South China Sea, belongs to a large scale pull-apart basin. The central depression of this basin is an abundant hydrocarbon-generating sag, which includes two sets of source rocks, that are Oligocene lacustrine mudstones, Early-Middle Miocene marine mudstones. The Oligocene lacustrine source rocks in this depression contain dominantly type Ⅰ-Ⅱ kerogen with high organic carbon contents ranging from 0.50% to (2.26%) and increasing usually from margin to depression center. The Early Miocene marine source rocks comprise types (Ⅱ-) Ⅲ kerogen and have a relatively low organic carbon content of 0.69%-0.93%. Potential hydrocarbon source index in the most of the depression has ranges of 4-10 t/m2 with a maximum value of 14 t/m2 in the Oligocene source rocks and of 4-7 t/m2 in Early Miocene source rocks. The oil-gas pools in the Wan'an basin are mainly distributed in the central depression and its adjacent areas including the NW fault-step belt, the northern and central lifts. But in the southern and northern depressions and nearby eastern lift, only a few hydrocarbon shows are observed. The results indicate that the oil-gas distribution in the Wan'an basin is obviously controlled by the abundant hydrocarbon-generating sag. |
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| Keywords: | central depression hydrocarbon-generating potential oil-gas distribution Wan'an basin |
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