| 渤海海域莱州湾凹陷盐构造成因探讨 |
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| 引用本文： | 孙和风,彭文绪,周心怀.渤海海域莱州湾凹陷盐构造成因探讨[J].大地构造与成矿学,2009,33(3). |
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| 作者姓名： | 孙和风 彭文绪 周心怀 |
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| 作者单位： | 1. 中国石油大学(北京)资源与信息学院,北京,102249;中海石油(中国)有限公司天津分公司勘探开发研究院,天津,300452
2. 中海石油(中国)有限公司天津分公司勘探开发研究院,天津,300452 |
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| 基金项目： | 中国海洋石油公司重点项目(SC06TJ-TQL-004)资助成果 |
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| 摘 要： | 通过分析莱州湾凹陷盐构造特征,盐构造形成动力条件,探讨莱州湾凹陷盐构造成因,讨论了走滑背景下盐岩活动特点。分析表明,莱州湾凹陷盐层构造发育刺穿性盐株和枕状底辟,欠压实、超压破裂、潜伏走滑断层和楔形体的重力扩张促使了莱州湾凹陷盐岩早期流动;渐新世右行走滑阶段,走滑压扭作用下形成刺穿盐株;盐构造活动可分为沙三末期-沙一段沉积期盐流动阶段、中晚渐新世东营沉积时期盐刺穿阶段、中新世-第四纪盐构造再次活化三个阶段。走滑断裂作用下盐岩以流动为主,发育典型的刺穿型盐底辟。
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| 关 键 词： | 渤海海域 莱州湾凹陷 盐构造 郯庐走滑断裂 |
Mechanics of Salt Tectonics in Laizhouwan Sag, Offshore Bohai Bay Basin |
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| SUN Hefeng,PENG Wenxu,ZHOU Xinhuai.Mechanics of Salt Tectonics in Laizhouwan Sag, Offshore Bohai Bay Basin[J].Geotectonica et Metallogenia,2009,33(3). |
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| Authors: | SUN Hefeng PENG Wenxu ZHOU Xinhuai |
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| Abstract: | The salt tectonics in the onshore Bohai Bay basin have been discussed,yet it had not been discovered in offshore part before 2006. Using the high-resolution 3D seismic and geological date,this paper describes the halokinesis of the salt tectonics and episodic fluid flow in the Laizhouwan sag which is situated in the south part of the offshore Bohai Bay basin. The salt bed structures in the Sha-4 Member of the Paleogene are mainly salt pillows and diaper in the Laizhouwan sag. The shapes of the salt tectonics change regularly along the S-N direction from post-diapir to diapir and pillow. The thickness variations of the suprasalt layers record three growth phases of the salt wall: early diapirism,active diapirism and arching from the Eocene to the Quaternay. The development of the salt tectonics was controlled by multi-factors induced by the dextral strike-slipping movement of the Tan-Lu fault,which formed a retaining bend in the studied area. In the early Oligocene,the salt tectonics were initiated by overpressure formation fractures and gravitational spreading. The dextral strike-slipping movement of the Tan-Lu fault plays an important role in the development of the salt tectonics in the terminal Oligocene. Strike-slipping contraction controls the growth and styles of the salt tectonics after middle Oligocene. Background in the strike-slipping,salt gliding and diapir are main characteristics. |
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| Keywords: | offshore Bohai Bay basin Laizhouwan sag salt tectonics Tan-Lu fault |
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