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地球科学进展  2008, Vol. 23 Issue (6): 562-569    DOI: 10.11867/j.issn.1001-8166.2008.06.0562
研究论文     
深水盆地中大型侵入砂岩的地震识别及其成因机制探讨
吴时国1,孙运宝1,2,孙启良1,2,董冬冬1,2,袁圣强1,2,马玉波1,2
1.中国科学院海洋研究所,中国科学院海洋地质与环境重点实验室,山东 青岛 266071;2.中国科学院研究生院,北京 100049
Seismic Identification and Formation Mechanism of Large-scale Sandstone Intrusions in Deep-water Basin
Wu Shiguo1,Sun Yunbao1,2,Sun Qiliang1,2,Dong Dongdong1,2,Yuan Shengqiang1,2,Ma Yubo1,2
1.Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2.Graduste University of Chinese Academy of Sciences, Beijing 100049,China
 全文: PDF(2971 KB)  
摘要:

侵入砂岩是深水盆地中常见的地质现象,由于本身具有高孔隙度、高渗透率的特点,对深水油气储集、运移和成藏均有重要的影响。综合国内外研究成果,探讨了深水盆地中大型侵入砂岩的地震特征和成因机制。研究表明侵入砂岩具有明显的强振幅地震反射,这些振幅异常一般呈V字形反射形态,沿着走向反映出一系列的特点,如阶梯性、分支性等,并伴有极性反转和高速度异常,在侵入砂岩下部的喉道出现上拉现象;关于侵入砂岩的成因,认为是未固结成岩阶段深水盆地中的异常超压砂体的向上侵位形成,大型的侵入砂岩及其伴生的断裂系统为流体运移提供渗流通道,深部水道或深水扇系统为侵入砂岩提供充足的物源。

关键词: 侵入砂岩多边形断裂深水盆地水道沉积地震属性    
Abstract:

Large-scale sandstone intrusions are important components of many deep-water clastic systems. They were formed by the unconsolidated sandstones of early burial stages remobilizing and injecting into the overlying strata and were commonly found in fine-grained argillaceous sediments developed in polygonal fault network. They can affect the distribution of sandstone reservoir, the vertical migration and oil/gas accumulation for their high porosity and high permeability. By integrating the research results at home and abroad,the seismic character and formation mechanism of large-scale sandstone intrusions are discussed. Results shows that they often form complex and spectacular features on 3D seismic data, such as a distinctive suite of discordant, high-amplitude reflections, the opposite polarity of upper and lower reflections, conical amplitude, horizon pull-down and so on. The sandstone intrusions are resulted from extremely high pressure in deep water environment. The presence of a widespread region of conical sandstone instrusions in the deep-water basin has important implications for vertical fluid migration in the region. 

Key words: Sandstone intrusions    Polygonal faults    Deep-water basin    Channel deposits    Seismic attribute.
收稿日期: 2008-01-03 出版日期: 2008-06-10
:  P315.1  
基金资助:

中国科学院知识新工程重要方向项目“南海北部深水海域油气勘探的关键问题研究”(编号:KZCX2-YW-203);863项目“浅水流形成机理及其地球物理识别技术研究”(编号:2006AA09Z349)资助.

通讯作者: 吴时国     E-mail: geology_wu@yahoo.com
作者简介: 吴时国(1963-),男,湖北襄阳人,研究员,主要从事海洋地质研究.E-mail:geology_wu@yahoo.com
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引用本文:

吴时国,孙运宝,孙启良,董冬冬,袁圣强,马玉波. 深水盆地中大型侵入砂岩的地震识别及其成因机制探讨[J]. 地球科学进展, 2008, 23(6): 562-569.

Wu Shiguo,Sun Yunbao,Sun Qiliang,Dong Dongdong,Yuan Shengqiang,Ma Yubo. Seismic Identification and Formation Mechanism of Large-scale Sandstone Intrusions in Deep-water Basin. Advances in Earth Science, 2008, 23(6): 562-569.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2008.06.0562        http://www.adearth.ac.cn/CN/Y2008/V23/I6/562

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