万安盆地中部坳陷——一个巨大的富生烃坳陷

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

国土资源部广州海洋地质调查局, 广东广州 510760

基金项目:

国土资源部南沙油气勘查专项 93-517

详细信息

作者简介:
金庆焕（1934－）, 男, 中国工程院院士, 博士生导师, 教授级高级工程师, 从事海洋地质、石油地质研究工作

中图分类号: P618.13
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出版历程
- 收稿日期: 2004-06-05
- 刊出日期: 2004-09-25

The Central Depression of the Wan'an Basin, South China Sea: A Giant Abundant Hydrocarbon-Generating Depression

Guangz hou Marine Geological Survey Bureau, Ministry of Land and Resources, Guangzhou 510760, China

摘要

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.
- 中部坳陷 /
- 生烃潜力 /
- 油气分布 /
- 万安盆地
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.
- central depression /
- hydrocarbon-generating potential /
- oil-gas distribution /
- Wan'an basin

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图 1 万安盆地断裂分布及构造区划

1.盆地边界; 2.二级构造单元界线; 3.断裂; 4.剖面线; Ⅰ.北部坳陷; Ⅱ.北部隆起; Ⅲ.中部坳陷; Ⅳ.中部隆起; Ⅴ.南部坳陷; Ⅵ.东部隆起; Ⅶ.东部坳陷; Ⅷ.西北断阶; Ⅸ.西部坳陷; Ⅹ.西南斜坡

Fig. 1. Tectonic units and fault distribution of Wan'an basin

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图 2 万安盆地构造剖面

Fig. 2. Structural profile of Wan'an basin

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图 3 万安盆地渐新统(T₄-T₅)沉积相

Fig. 3. Oligocene depositional facies of Wan'an basin

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图 4 万安盆地中新统(T₃¹-T₄)沉积相

Fig. 4. Miocene depositional facies of Wan'an basin

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图 5 万安盆地下中新统炭质泥岩甾萜烷生物标志化合物分布特征(Todd et al., 1997)

Fig. 5. Distribution features of biological compound of terpane and sterane in Lower Miocene carbargillite, Wan'an basin

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图 6 万安盆地中部坳陷生油、气强度曲线

Fig. 6. Intensity curve of oil and gas-generating in central depression, Wan'an basin

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图 7 万安盆地渐新统—中新统含油气系统分布

Fig. 7. Oligocene-Miocene petroleum system of Wan'an basin

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表 1 万安盆地油气藏纵向分布特征

Table 1. Characteristics of vertical oil-gas reservoirs distribution in Wan'an basin

表 2 万安盆地油气横向分布

Table 2. Characteristics of horizontal oil-gas reservoirs distribution in Wan'an basin

参考文献(15)

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金庆焕, 吴进民, 谢秋元, 等, 2001. 南沙西部海域沉积盆地分析与油气资源. 武汉: 中国地质大学出版社.
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