| 标定大陆科学钻探孔区地震反射体 |
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| 引用本文： | 杨文采,张春贺,朱光明.标定大陆科学钻探孔区地震反射体[J].地球物理学报,2002,45(3):370-384. |
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| 作者姓名： | 杨文采 张春贺 朱光明 |
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| 作者单位： | 1. 中国地质科学院地质研究所,北京,100037
2. 长安大学应用地球物理研究所,西安,710054 |
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| 基金项目： | 中国大陆科学钻探项目 (98-3 )，国家自然科学基金项目 (4 0 1 740 1 3 ) |
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| 摘 要： | 在中国大陆科学钻探孔区 (江苏省东海县南部 )进行了系统的地球物理调查 ,包括二维地震测网和专门的地震剖面 ,大地电磁法和位场方法等 .地震调查表明 ,在超高压变质岩出露区上地壳充满了反射体 ,包括倾斜反射体与上拱的反射弧 .本文介绍大陆科学钻探先行研究中地震调查的成果 .根据大陆科学钻探预先导孔的岩芯和测井资料、井旁VSP和数值模拟结果证实 ,高波速的榴辉岩体、破碎断裂带和大型韧性剪切带都可引起倾斜的地震反射 ,而上拱的弧形反射体则是由近似直立的榴辉岩体和其中的破碎带的综合反映 .由于地壳深部广泛分布着经受变质的岩石 ,上述研究结果对标定地壳中的反射地震信号具有一定意义
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| 关 键 词： | 深反射地震 变质岩区 大陆科学钻探 反射体来源 标定地震信号 |
| 文章编号： | 0001-5733(2002)03-0370-15 |
| 修稿时间： | 2000年6月30日 |
CALIBRATION OF SEISMIC REFLECTORS IN CHINESE CONTINENTAL DRILLING AREA |
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| YANG WEN CAI ZHANG CHUN HE ZHU GUANG MING Institute of Geology,CAGS,Beijing ,China Institute of Applied Geophysics,Chang An University,Xi'an\ ,China.CALIBRATION OF SEISMIC REFLECTORS IN CHINESE CONTINENTAL DRILLING AREA[J].Chinese Journal of Geophysics,2002,45(3):370-384. |
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| Authors: | YANG WEN CAI ZHANG CHUN HE ZHU GUANG MING Institute of Geology CAGS Beijing China Institute of Applied Geophysics Chang An University Xi'an\ China |
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| Institution: | YANG WEN CAI 1) ZHANG CHUN HE 1) ZHU GUANG MING 2) 1) Institute of Geology,CAGS,Beijing 100037,China 2) Institute of Applied Geophysics,Chang An University,Xi'an\ 710054,China |
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| Abstract: | Geophysical investigations have been carried out in the Chinese Continental Scientific Drilling (CCSD) site, including 2D seismic reflection, MT, gravity and magnetic surveys. Seismic surveys show that many reflectors, such as dipping reflectors and arch reflectors, occur in the upper crust of the drilling area. This paper shows the seismic results and interpretation of the seismic reflectors. Based on cores and well logging data from an CCSD pre pilot hole, VSP data and synthetic computations, we demonstrate that dipping reflectors can be caused by high velocity eclogite bodies, fractures and ductile shear zones. However, arch reflectors are resulted from steep eclogites plus low velocity fractures. As upper crust usually contains metamorphic rocks, the interpretation should be useful for calibration of deep reflection signals. |
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| Keywords: | Deep seismic reflection Metamorphic terrane Continental drilling Origin of reflectors Calibration of reflectors |
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