珠江口盆地白云东区古近纪挤压-伸展变形模式及勘探意义

王福国; 张向涛; 梅廉夫; 颜晖; 柳保军; 张忠涛; 刘军

doi:10.19509/j.cnki.dzkq.2022.0179

珠江口盆地白云东区古近纪挤压-伸展变形模式及勘探意义

doi: 10.19509/j.cnki.dzkq.2022.0179

1.
中海石油(中国)有限公司深圳分公司，广东深圳 518054
2.
中国地质大学(武汉)构造与油气资源教育部重点实验室，武汉 430074

基金项目:

中海石油(中国)有限公司深圳分公司重大生产性科研项目 CNOOC-KJ135ZDXM37SZ01SHENHAI

中海石油深海开发有限公司“万亿大气区”项目子课题“南海东部大中型天然气田勘探潜力与突破方向” KJZH-2021-0003-00

详细信息

作者简介:
王福国(1973—)，男，工程师，主要从事石油构造与成藏方面研究工作。E-mail: wangfg2@cnooc.com.cn

中图分类号: P542
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- 被引次数: 0
出版历程
- 收稿日期: 2021-07-19

Characteristics of Paleogene compression-extension deformation and exploration significance in the Baiyun East area, Pearl River Mouth Basin

1.
Shenzhen Branch of CNOOC Ltd., Shenzhen, Guangdong 518054, China
2.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences(Wuhan), Wuhan 430074, China

摘要

摘要:
珠江口盆地白云东区是白云凹陷2个有利成藏区之一，目前勘探正面临转向古近系深层的阶段，急需重新认识深层洼陷结构构造。为了解决珠江口盆地白云东区古近系深层缓坡带砂岩变少，与伸展型半地堑储层发育模式矛盾的问题，利用改善深层成像的重处理三维深度域地震资料及钻井数据进行综合解释，开展了白云东区古近系及基底之下滑脱面全三维构造解析。研究结果表明：按动力学机制对盆地演化阶段进行了重新划分, 构造层序由一个被动裂陷旋回，修改为被动裂陷-主动裂陷-被动裂陷3个旋回；构造幕由3分细化为6个幕次，即由断陷幕-断坳转换幕-坳陷幕细化为裂陷两幕-褶皱两幕-裂陷萎缩幕-漂移幕，细分方案更好地反映了地层变形规律。地层变形方式表现为基底呈东西向挤压构造，盖层为南北向伸展构造。伸展构造发育过程中，主动裂陷旋回参与的基底盖层脱耦变形的新模式协调了白云东区古近纪构造-沉积响应，补充了主动裂陷阶段盆地充填富泥旋回的认识，挤压-伸展同步变形模式丰富了南海盆地空间演化模式，支持了白云凹陷深层新领域的勘探。
- 挤压-伸展变形 /
- 滑脱面 /
- 构造演化 /
- 白云凹陷 /
- 珠江口盆地
Abstract:
The Baiyun East area is one of the two favorable reservoir-forming areas in the Baiyun Sag in the Pearl River Mouth Basin. At present, exploration is facing the stage of turning to the deep strata of the Paleogene. In recent years, drilling has found that the sandstone in the deep gentle slope zone becomes less abundant, which contradicts the development model of extensional half-graben reservoirs. Based on the comprehensive interpretation of deep reprocessing 3-D seismic data and drilling data, a full 3-D structural analysis of the Paleogene and subbasement detachment surface in the Baiyun East area is carried out. The basin evolution stages are reclassified according to the dynamic mechanism. The tectonic sequence has been modified from a passive rift cycle to three cycles of passive rift-active rift-passive rift.The tectonic episode is subdivided into six curtains from three stage cycles: fault episode-fault depression conversion episode-depression episode is subdivided into rift two subepisodes-fold two subepisodes-rift shrinking episode-drift episode, and the subdivision scheme better reflects the law of strata deformation.A new model of compression-extension deformation of the Paleogene basin has been established in the eastern Baiyun area. In the development process of the extensional structure, the new model coordinates the Paleogene structure-sedimentary response of the eastern Baiyun area. This model enriches the evolutionary model of the South China Sea Basin and provides support for the exploration of new deep areas in the Baiyun Sag.
- compressional-extensional deformation /
- detachment surface /
- tectonic evolution /
- Baiyun Sag /
- Pearl River Mouth Basin

HTML全文

图 1 研究区基底图

(红线为研究区边界，绿箭头指向北)

Figure 1. Basement structure map of the study area

下载: 全尺寸图片幻灯片

图 2 L32-L34井裂陷层序岩性特征图

(井点位置见图 1)

Figure 2. Lithologic characteristics of well L32-L34 rift sequence

下载: 全尺寸图片幻灯片

图 3 白云东区构造层划分

(剖面位置见图 1，T83是上下文昌组分界面，滑脱面是Tg，也是多期断层活动面)

Figure 3. Division of structural layers division in the Baiyun East area

下载: 全尺寸图片幻灯片

图 4 滑脱面三维图

(数据范围见图 1红线范围，箭头指向北)

Figure 4. Morphological characteristics of the detachment surface

下载: 全尺寸图片幻灯片

图 5 白云东区盖层伸展变形特征

(剖面位置见图 1，盖层顶薄翼厚特点说明基底褶皱作用与盖层伸展变形同步)

Figure 5. Characteristics of cover extension and deformation of the Baiyun East area

下载: 全尺寸图片幻灯片

图 6 南海大地构造位置及汇聚速度方向图

(修改自文献[18-19])

Figure 6. Geotectonic location and convergence velocity pattern of the South China Sea

下载: 全尺寸图片幻灯片

图 7 白云东区盆地挤压-伸展脱耦发育模式图

Figure 7. Compression-extension decoupling development basin pattern map of Baiyun East area

下载: 全尺寸图片幻灯片

表 1 白云东区构造层划分

Table 1. Division of structural layers in the Baiyun East area

地层组段		年龄/Ma	地震标志	构造运动	前人构造幕	本次研究构造幕	地球动力学
珠江组			T60	白云运动	坳陷幕	漂移幕	洋壳形成大陆漂移
珠海组		33.9	T70	南海运动	坳陷幕	漂移幕	洋壳形成大陆漂移
恩平组		38.0	T80	珠琼二幕	断坳转换幕	裂陷萎缩幕	被动裂陷
文昌组	文二段				断陷幕	褶皱一幕	主动裂陷
	文三段		T83	惠州运动		褶皱一幕	主动裂陷
	文四段		T83	惠州运动		裂陷一幕	被动裂陷
	文五段	47.8		珠琼一幕		裂陷一幕	被动裂陷

下载: 导出CSV

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