渤海郯庐断裂西支构造特征及对潜山形成的控制作用

李慧勇; 肖述光; 李飞; 孙哲; 刘凯

doi:10.19509/j.cnki.dzkq.2021.0503

渤海郯庐断裂西支构造特征及对潜山形成的控制作用

doi: 10.19509/j.cnki.dzkq.2021.0503

基金项目:

“十三五”国家科技重大专项 2016ZX05024-003

详细信息

作者简介:
李慧勇(1978-), 男, 高级工程师, 主要从事油气勘探研究工作。E-mail: lihy11@cnooc.com.cn

通讯作者:
肖述光(1986 —), 男, 工程师, 主要从事石油构造分析方面的研究工作。E-mail: xiaoshg3@cnooc.com.cn

中图分类号: P54
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出版历程
- 收稿日期: 2021-06-23

Structural characteristics of the Western Branch of the Tanlu fault in Bohai Sea and its control on the formation of buried hills

摘要

摘要: 渤海郯庐断裂西支是指郯庐断裂渤海段西侧分支断层，其形成演化对前新生代地层展布和潜山构造发育具有重要控制作用。基于三维地震、钻井、分析化验等资料，对渤海郯庐断裂西支构造特征、成因演化模式，以及对潜山形成的控制作用进行了分析。研究表明：①渤海郯庐断裂西支具有印支期、燕山早期、燕山中期、喜山早期多期叠加活动的特征，喜山晚期活化作用弱，整体隐伏于新生代沉积物之下；②渤海郯庐断裂西支具有显著的分段性，被近东西向断裂分割成北、中、南3段，各段在关键地质时期构造变形型式和强度存在一定差异；③印支期不均一南北向挤压所导致的走滑转换是渤海郯庐断裂西支的启动机制；④渤海郯庐断裂西支在印支期-燕山早期走滑逆冲活动及伴生褶皱是控制潜山地层展布及渤中19-6等潜山构造形成的关键因素。研究成果可以为渤海海域的油气勘探提供基础。
- 渤海 /
- 郯庐走滑断裂带 /
- 印支期 /
- 燕山期 /
- 潜山 /
- 构造演化
Abstract: The Western Branch of the Tanlu fault in Bohai Sea refers to the Western Branch fault of Bohai segment of the Tanlu fault, the formation and evolution of which plays an important role in controlling the distribution of pre Cenozoic strata and the development of the structure of buried hills.Based on the data of 3D seismic, drilling and experimental data, the structural characteristics, genetic evolution model of the Western Branch of the Tanlu fault in Bohai Sea and its control on the formation of buried hills are analyzed.The results show that: ①the Western Branch of Tanlu fault in Bohai Sea is characterized by multi-stage superimposed activities in Indosinian, Yanshanian and Himalayan.The activation of late Himalayan is weak, and it is concealed under Cenozoic sediments.②The Western Branch of the Tanlu fault in Bohai Sea is divided into three segments: north, middle and south by nearly EW trending fault.There are some differences in the structural deformation patterns and strength of each segment in the key geological period.③The Western Branch of the Tanlu fault in Bohai Sea was originated from strike slip transition caused by uneven N-S compression in Indosinian.④Indosinian-Yanshanian strike slip thrust and associated folds in the Western Branch of the Tanlu fault in Bohai Sea are the key factors controlling the distribution of strata buried hills and the formation 19-6 buried hill structures of Bozhong.The research results can provide a basis for oil and gas exploration in Bohai Sea.
- Bohai Sea /
- Tanlu strike slip fault zone /
- Indosinian /
- Yanshanian /
- buried hill /
- tectonic evolution

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图 1 渤海西南部海域构造简图及地层柱状图

Figure 1. Structural sketch and stratigraphic column map of the southwestern Bohai Sea

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图 2 郯庐断裂西支南段构造特征(剖面位置见图 1)

Figure 2. Structural characteristics of the southern part of the Western Branch of the Tanlu fault

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图 3 郯庐走滑断裂西支中段构造特征(剖面位置见图 1)

Figure 3. Structural characteristics of the middle of Western Branch of Tanlu strike-slip fault

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图 4 郯庐断裂西支北段构造特征(剖面位置见图 1)

Figure 4. Structural characteristics of the northern section of Western Branch of Tanlu strike-slip fault

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图 5 渤海西南部海域关键构造期次及其构造-应力场特征(NCB.华北板块；SCB.华南板块)

Figure 5. Key tectonic periods and characteristics of tectonic stress field in the southwest Bohai Sea

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图 6 郯庐断裂西支中段构造演化特征(剖面位置见图 1中D-D′)

Figure 6. Structural evolution of the middle segment of the Western Branch of the Tanlu fault

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图 7 渤海南部海域BH1井壁心、薄片照片

a.磁铁石英岩壁心照片(采样深度3 871.0 m)；b.磁铁石英岩中粒状、长板状磁铁矿(单偏光)(采样深度3 871.5 m)；c.粗面岩壁心照片(采样深度3 454.0 m)；d.粗面岩中部分斑晶被方解石交代(正交偏光)(采样深度3 454.0 m)

Figure 7. Image of coring and thin section Well BH1 in southern Bohai Sea

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图 8 BH1井火山岩(a)和磁铁石英岩(b)锆石年龄加权平均值

Figure 8. Weighted average zircon ages of volcanic rocks (a) and magnetite quartzite (b) from Well BH1

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图 9 渤海西南部地区潜山地层对比图(据文献[28]修改)

Figure 9. Stratigraphic correlation map of buried hill in southwest Bohai Sea

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图 10 渤中19-6潜山演化模式图

Figure 10. Evolution model map of 19-6 buried hill of Bozhong

下载: 全尺寸图片幻灯片

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