琼东南盆地宝岛21-1区陵水组沉积特征及其油气地质意义

江汝锋; 曹立成; 邓孝亮; 何云龙; 焦垚祺; 陈子归; 李韬; 张祺

doi:10.19509/j.cnki.dzkq.tb20230329

琼东南盆地宝岛21-1区陵水组沉积特征及其油气地质意义

doi: 10.19509/j.cnki.dzkq.tb20230329

1.
中海石油(中国)有限公司海南分公司, 海口 570311
2.
中国地质大学(武汉)海洋地质资源湖北省重点实验室, 武汉 430074

基金项目:

中海石油(中国)有限公司科技项目课题 CCL2021HNFN0219

中央高校优秀青年团队项目"南海深水沉积过程及资源效应"

详细信息

作者简介:
江汝锋, E-mail: jiangrf2@cnooc.com.cn

通讯作者:
曹立成，E-mail：lichengcao@cug.edu.cn

中图分类号: P618. 130.2
计量
- 文章访问数: 103
- PDF下载量: 53
- 被引次数: 0
出版历程
- 收稿日期: 2023-06-09
- 录用日期: 2023-11-01
- 修回日期: 2023-10-30

Sedimentary characteristics of the Lingshui Formation in the Baodao 21-1 area of the Qiongdongnan Basin and their significance in hydrocarbon exploration

1.
Hainan Branch of China National Offshore Oil Corporation, Haikou 570311, China
2.
Hubei Key Laboratory of Marine Geological Resources, China University of Geosciences(Wuhan), Wuhan 430074, China

More Information

Author Bio:
JIANG Rufeng, E-mail: jiangrf2@cnooc.com.cn

Corresponding author: CAO Licheng, E-mail: lichengcao@cug.edu.cn

摘要

摘要:
近期在琼东南盆地宝岛21-1区发现了我国首个深水深层大气田, 对南海深水区深层油气勘探研究具有重要意义。基于宝岛21-1区最新获得的钻井和地震资料, 分析了上渐新统陵水组三段的沉积特征及其油气地质意义。结果表明, 陵三段沉积时期以双向物源为主, 早期扇三角洲沉积发育于邻近高地, 晚期辫状河三角洲沉积受NW向海南隆起物源和NE向神狐隆起物源的控制。此外, 陡坡和缓坡的沉积物搬运通道表现出较大差异。陵三段沉积演化可分为3个阶段: 由早期扇三角洲沉积、中期扇三角洲-辫状河三角洲沉积发展至晚期辫状河三角洲沉积, 物源区也从早期邻近高地的单向供源、中期邻近高地-神狐隆起的双向供源演化至晚期海南隆起-神狐隆起的双向供源。研究区邻近崖城组烃源岩, 发育12-1号断裂及伴生断裂, 形成构造-岩性圈闭, 成藏地质条件优越。宝岛21-1区气田的发现是我国深水油气勘探领域的重大突破, 指明了海相盆地中断裂转换带是未来深水勘探的关键区域。
- 琼东南盆地 /
- 宝岛21-1区 /
- 陵水组 /
- 沉积特征 /
- 油气勘探
Abstract: Objective
The first deepwater and deep-stratum gas field was recently discovered in the Baodao 21-1 area of the Qiongdongnan Basin, which is of great significance for petroleum exploration in the deep-water area of the South China Sea.
Methods
Based on the newly acquired drilling-seismic data, the sedimentary characteristics of the Third Member of the Upper Oligocene Lingshui Formation and their significance in hydrocarbon exploration were analyzed in the Baodao 21-1 area.
Results
Bidirectional sediment provenances controlled the deposition of the Third Member of the Lingshui Formation, resulting in the early deposition of fan delta in the adjacent uplands and the late deposition of braided river delta fed by sediment sources of the Hainan Uplift on the northwest and the Shenhu Uplift on the northeast. In addition, the routes of sediment transport between steep and gentle slopes show great variability. The evolution of the sedimentary system in the Third Member of the Lingshui Formation can be divided into three stages, including the fan delta deposition in the early stage, the fan delta and braided river delta depositions in the middle stage, and the braided river delta deposition in the late stage. Correspondingly, the sediment provenances changed from the adjacent highlands in the early stage, to both adjacent highlands and Shenhu Uplift in the middle stage, and finally to both Hainan Uplift and Shenhu Uplift in the late stage. The Baodao 21-1 area is close to the hydrocarbon kitchen of the Yacheng Formation and it contains the No.12-1 Fault-Fracture systems and the tectonic-lithologic traps, favoring the petroleum accumulation.
Conclusion
The discovery of the Baodao 21-1 gas field is a breakthrough in deepwater petroleum exploration in China, pointing out that the fracture transition zone of marine basins is a key area for future deepwater exploration.
- Qiongdongnan Basin /
- Baodao 21-1 area /
- Lingshui Formation /
- sedimentary characteristics /
- hydrocarbon exploration
注释:

所有作者声明不存在利益冲突。

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图 1 琼东南盆地构造单元图及研究区位置(修改自文献[2])

Figure 1. Tectonic units of the Qiongdongnan Basin and the study area location

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图 2 琼东南盆地地层柱状图(修改自文献[36])

Figure 2. Stratigraphic column of the Qiongdongnan Basin

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图 3 研究区层序地层剖面解释(a)及过A、B、C井陵三段连井剖面(b, c) (各地震界面代号见图 2，井位及剖面位置见图 1, 下同)

MFS为最大洪泛面；GR为自然伽马曲线；DTCO为声波时差曲线

Figure 3. Sequence stratigraphic framework of the Third Member of the Lingshui Formation showing the seismic profile(a) and wells (wells A, B, and C)(b, c)

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图 4 宝岛21-1区D井陵三段岩性柱状图

Figure 4. Lithological column for the Third Member of the Lingshui Formation in Well D of the Baodao 21-1 area

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图 5 宝岛21-1区D井陵三段典型岩心照片

Figure 5. Typical core images of the Third Member of the Lingshui Formation in Well D of the Baodao 21-1 area

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图 6 宝岛21-1区过陵三段扇三角洲(a)及辫状河三角洲(b)地震剖面(井位及剖面位置见图 1, 地震界面代号见图 2)

F12为宝岛凹陷12号断层; MFS为最大洪泛面

Figure 6. Seismic profiles showing the fan delta(a) and braided river delta(b) of the Third Member of the Lingshui Formation in the Baodao 21-1 Area

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图 7 基于地震均方根振幅与相干体切片(深度3 000 m)揭示的宝岛21-1区陵三段6期(a~f对应第1~6期) 砂体展布

Figure 7. Distributions of the six-phase sandstone bodies in the Third Member of the Lingshui Formation in the Baodao 21-1 area, revealed by the root mean square amplitude and coherence slice(3 000 m)

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图 8 研究区北部平行海南隆起物源方向地震剖面(地震界面代号见图 2，剖面位置见图 7f)

Figure 8. Seismic profile in the north of the study area striking parallel to the provenance direction of the Hainan Uplift

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图 9 研究区扇三角洲(a, b)和辫状河三角洲(c, d)沉积搬运方式(地震界面代号见图 2，剖面位置见图 7f)

Figure 9. Sediment transport types of fan delta (a, b) and braided river delta (c, d) in the study area

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图 10 宝岛21-1区陵三段沉积演化

a, b, c.低位体系域第1, 2, 3期沉积体系展布; d, e, f.高位低系域第4, 5, 6期沉积体系展布

Figure 10. Sedimentary evolution of the Third Member of the Lingshui Formation in the Baodao 21-1 area

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图 11 宝岛21-1区地震剖面(a)及油气运移模式示意图(b) (地震界面代号见图 2，剖面位置见图 7f)

Figure 11. Seismic profile(a) and schematic model of petroleum migration(b) in the Baodao 21-1 area

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