南薇西含油气盆地地层层序及生储盖组合特征

周佳维; 张莉; 雷振宇; 鄢伟; 骆帅兵; 钱星

doi:10.16562/j.cnki.0256-1492.2021051201

南薇西含油气盆地地层层序及生储盖组合特征

1.
中国地质调查局广州海洋地质调查局，广州 510760

2.
自然资源部海底矿产资源重点实验室，广州 510760

基金项目: 中国地质调查局二级项目（DD20190213）

详细信息

作者简介: 周佳维（1993—），男，硕士，助理工程师，主要从事海域油气资源调查研究，E-mail：1115477978@qq.com

通讯作者: 张莉（1965—），女，博士，教授级高级工程师，主要从事海洋地质、海洋石油地质等研究，E-mail：zhangligmgs@qq.com

中图分类号: P736.1

收稿日期: 2021-05-12

修回日期: 2021-07-19

刊出日期: 2021-12-28

Characteristics of stratigraphic sequence and the source-reservoir-cap assemblages in the Nanweixi petroliferous basin

1.
Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 510760, China

2.
Key Laboratory of Marine Mineral Resources, Ministry of Natural Resources, Guangzhou 510760, China

More Information

Corresponding author: ZHANG Li, zhangligmgs@qq.com

Received Date: 12 May 2021

Revised Date: 19 July 2021

Publish Date: 28 December 2021

摘要

摘要:
以广州海洋地质调查局二维多道地震资料和国外钻井资料为基础，厘清区域地质演化过程及其对盆地地层发育的影响，建立邻区盆地地层层序格架。利用跨盆地地震测线，参考邻区盆地，厘定南薇西盆地地层层序及年代，分析地层生储盖组合特征及其油气地质意义。结果表明，盆地内可追踪识别出7条不整合面（T₁, T₂，T₃，T₃¹，T₄，T₅，T_g），将地层划分为7个层序，除T₁界面之外，其他不整合面分别对应新生代重要地质事件（广雅运动、万安运动、南沙运动、南海运动、西卫运动、礼乐运动）；盆地成盆年代与邻区盆地相同，基底年代为晚白垩世，推测主要发育花岗岩、火成岩和变质岩，T₃界面是盆地内最为显著的不整合面，年代为10.4 Ma，对应万安运动；始新世以来发育三种类型生储盖组合，中新世盆地发育碳酸盐岩地层，可为良好的储层，盆地生、储、盖组合较好，具有良好的油气资源前景。
- 地层年代 /
- 构造运动 /
- 不整合面 /
- 南薇西盆地
Abstract:
Based on the 2D multi-channel seismic data from the Guangzhou Marine Geological Survey and the drilling data collected from foreign companies, we studied in this paper the regional geological evolutionary process of the Nanweixi basin and its influence on the development of basin strata. By referring to the stratigraphic sequence frameworks of adjacent basins, cross basin seismic lines are used as tools for stratigraphic correlation. the stratigraphic sequence and chronology of the Nanweixi basin are established then, and the characteristics of source-reservoir-cap assemblage and their petroleum geological significance are analyzed. A total of seven unconformities(T₁, T₂, T₃, T₃¹, T₄, T₅, T_g)are identified, which can be traced in the basin and used to divide the strata into seven sequences. Excluding the T₁ unconformity, they correspond to important Cenozoic geological events of Guangya movement, Wan^,an movement, Nansha movement, Nanhai movement, Xiwei movement, Liyue movement in descending order. The basement of the basin is late Cretaceous in age, as same as that of the surrounding basins. And it is speculated that igneous rocks dominated by granite and metamorphic rocks are well developed. As the most significant unconformity in the basin, the T₃ unconformity is aged 10.4 Ma, corresponding to the Wan'an movement. Three types of source-reservoir-cap assemblages have formed since Eocene. In Miocene, carbonate strata are developed in the basin, and may become a high-quality reservoir. There are excellent source-reservoir-cap assemblages in the basin which may suggest a promising oil and gas prospect.
- stratigraphic chronology /
- tectonic movement /
- unconformity /
- Nanweixi Basin

HTML全文

图 1 南海南部主要盆地分布及研究区位置图

Figure 1.

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图 2 地震测线M局部剖面图

Figure 2.

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图 3 万安盆地过测线M测线井柱

Figure 3.

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图 4 测线M碳酸盐岩台地地震剖面

Figure 4.

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图 5 测线M地震剖面图

Figure 5.

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图 6 万安盆地钻井连井剖面

Figure 6.

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表 3 万安盆地过测线M井资料

Table 3. Data of the wells crossing seismic line M in Wanan Basin

井名	井深/m	钻遇碳酸盐岩深度/m	碳酸盐岩年代
A	2462	2237	中中新世
B	2593	2363	中中新世
C	2442	−	−

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表 4 万安盆地基底钻井资料

Table 4. Wells penetrated the basement of the Wanan Basin

井名	井深/m	岩性	年代
04-A 1X	2462	风化基底，花岗岩	白垩纪
05-1a-DH03P	2569	花岗质片麻岩	白垩纪
05-1a-DH05P	2994	花岗质片麻岩	白垩纪
05-1a-DH05X	3094	花岗质片麻岩	白垩纪
05-DH 02X	2836	花岗岩	白垩纪
05-DH 03X	3758	花岗岩	晚侏罗世
06-A 1X	4202	花岗岩	白垩纪
12-B 1X	3948	侵入火成岩	白垩纪
12-C 1X	3657	侵入火成岩	白垩纪
12W-CC 1X	2894	花岗岩、闪长岩	白垩纪
注：井资料来自IHS数据库。

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