西湖凹陷平北斜坡带平湖组层序构型差异及控砂模式

徐东浩; 秦兰芝; 李峻颉; 蔡坤; 谢晶晶

doi:10.19509/j.cnki.dzkq.tb20240027

西湖凹陷平北斜坡带平湖组层序构型差异及控砂模式

doi: 10.19509/j.cnki.dzkq.tb20240027

中海石油(中国)有限公司上海分公司, 上海 200335

基金项目:

中海石油(中国)有限公司上海分公司生产性科研项目“西湖凹陷古近系区域沉积体系研究及规模岩性圈闭勘探方向”

中国海洋石油集团“十四五”重大科技项目“弧后盆地深层/超深层油气成藏条件与成藏机制研究——西湖凹陷” KJGG2022-0402

详细信息

通讯作者:
徐东浩, E-mail: xudh6@cnooc.com.cn

中图分类号: P618.13
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- 文章访问数: 277
- PDF下载量: 107
- 被引次数: 0
出版历程
- 收稿日期: 2024-01-20
- 录用日期: 2024-03-14
- 修回日期: 2024-03-07

Sequence stratigraphic architectures and sand-body distribution models of the Pinghu Formation in the Pingbei slope belt of the Xihu Depression

Shnghai Branch of CNOOC, Shanghai 200335, China

More Information

Corresponding author: XU Donghao, E-mail: xudh6@cnooc.com.cn

摘要

摘要:
平北斜坡带是西湖凹陷岩性油气藏勘探的重点区带之一, 但实际勘探过程中存在岩性砂体厚度小、横向变化大等问题, 亟需开展不同构造单元内地层发育样式、沉积中心变迁、砂体发育机制等构造-沉积响应研究。基于最新钻井、测井及覆盖全区的高精度三维地震资料, 开展了平北斜坡带平湖组三级层序-体系域高精度层序地层研究。基于古地貌、断裂体系的差异, 划分了平北斜坡带构造-沉积单元, 分析了不同单元内层序构型下断裂组合样式、地层接触关系、沉积充填样式的差异, 探讨了不同层序构型差异的控制因素和控砂模式。研究表明, 平北斜坡带可以划分为断裂陡坡型、对向断阶型、反向断阶型、顺向断阶型4种层序构型, 层序构型差异受物源供给强弱变化、断裂体系活动差异、微古地貌转换调节、基准旋回迁移变化等控制, 形成了4种砂体发育模式。通过不同构造单元层序构型差异和控砂机制研究, 对于推动西湖凹陷平北斜坡带岩性油气藏领域勘探进程意义重大。
- 平北斜坡带 /
- 平湖组 /
- 层序构型 /
- 控砂模式
Abstract: Objective
The Pingbei slope belt is one of the key zones for the exploration of lithologic reservoirs in the Xihu Depression. However, the exploration process was inhibited by issues of small thickness and significant lateral variation of sand-bodies. Therefore, research on the tectonic-sedimentary response, including the stratigraphic development patterns, deposition center evolution, and sand-body distribution mechanisms in different tectonic units, is urgently needed.
Methods
Integrating the newly obtained well drilling, well logging, and high-resolution 3D seismic data, a high-precision sequence stratigraphic framework was established and the third-order sequences and systems tracts were analysed in the Pinghu Formation of the Pingbei slope belt.
Results
Based on differences in palaeogeomorphology and fault systems, the tectonic-sedimentary units of the Pingbei slope zone were classified. Differences in fault styles, stratigraphic contact relationships, and sedimentary filling patterns under different sequence stratigraphic architectures were analysed in various tectonic units. Additionally, the controlling factors and models of sand-body distribution in various sequence stratigraphic architectures were discussed.
Conclusion
This study revealed that the Pingbei slope zone can be divided into four types of sequence stratigraphic architectures: steep fault slope, opposite fault step, reversal step fault, and forward step fault. The sequence stratigraphic architectures that were controlled by factors of sediment supply, fault activity, palaeogeomorphic, and base-level cycles generated four sand-body distribution models. Research on the differences in sequence configurations and sand-body distribution models in different tectonic units is important for promoting the exploration of lithological reservoirs in the Pingbei slope belt of the Xihu Depression.
- Pingbei slope belt /
- Pinghu Formation /
- sequence stratigraphic architecture /
- sand-body distribution model
注释:

所有作者声明不存在利益冲突。

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图 1 区域构造特征(a)、研究区断裂、剖面与井位分布(b)及地貌单元特征(c)

Figure 1. Regional tectonic characteristics (a), fault, profile and well location distributions (b), and geomorphological characteristics (c)

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图 2 西湖凹陷新生代地层综合柱状图以及平湖组三级层序地层单元

Figure 2. Comprehensive column of Cenozoic strata and third-order sequence stratigraphic unit of the Pinghu Formation in the Xihu Depression

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图 3 西湖凹陷平北地区B-5井平湖组层序界面综合识别

HST. 高位体系域; TST. 海侵体系域; LST. 低位体系域

Figure 3. Comperhensive identification of the Pinghu Formation sequence in Well B-5 in the Pingbei area, Xihu Depression

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图 4 西湖凹陷平北斜坡带A区地震层序地层特征

Figure 4. Seismic sequence stratigraphic characteristics of area A of the Pingbei slope belt, Xihu Depression

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图 5 西湖凹陷平北斜坡带B区和C区地震层序地层特征

Figure 5. Seismic sequence stratigraphic characteristics of areas B and C of the Pingbei slope belt, Xihu Depression

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图 6 西湖凹陷平北斜坡带D区地震层序地层特征

Figure 6. Seismic sequence stratigraphic characteristics of area D of the Pingbei slope belt, Xihu Depression

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图 7 A-1-A-2-A-3井钻井层序连井剖面

Figure 7. Sequence stratigraphic correlation section of wells A-1, A-2 and A-3

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图 8 D-1-D-2-D-4-D-3-D-6井钻井层序连井剖面

Figure 8. Sequence stratigraphic correlation sections of wells D-1, D-2, D-4, D-3 and D-6

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图 9 西湖凹陷平北斜坡平湖组层序平面分布图

Figure 9. Distribution map of the Pinghu Formation stratigraphic sequence in the Pingbei slope of the Xihu Depression

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图 10 西湖凹陷平北地区断裂陡坡型层序构型

Figure 10. Sequence stratigraphic architecture of steep fault slope type in the Pingbei area, Xihu Depression

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图 11 西湖凹陷平北地区对向断阶型层序构型

Figure 11. Sequence stratigraphic architecture of opposite fault step type in the Pingbei area, Xihu Depression

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图 12 西湖凹陷平北地区反向断阶型层序构型

Figure 12. Sequence stratigraphic architecture of reversal step fault type in the Pingbei area, Xihu Depression

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图 13 西湖凹陷平北地区顺向断阶型层序构型

Figure 13. Sequence stratigraphic architecture of forward step fault type in the Pingbei area, Xihu Depression

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图 14 西湖凹陷平北地区差异层序构型下控砂模式图

Figure 14. Sand-body distribution models under different sequence configurations in the Pingbei area, Xihu Depression

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