西藏伦坡拉地区地震资料成像方法研究
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摘要
西藏伦坡拉盆地受藏北大断裂的控制作用,地层破碎,断裂、逆冲推覆体等地质现象错综复杂,地下地质构造高陡。同时由于表层岩性的差别,近地表地层厚度与速度横向变化剧烈,造成采集单炮干扰波复杂,地震波吸收衰减严重,资料信噪比整体很低。为此,开展了层析静校正、精细速度分析、偏移成像方法试验等方面的研究。通过实际资料的应用,剖面信噪比有了明显的改善,波组特征更加清晰,达玉山断裂构造带的成像效果得到明显提高。
Under the control of major dislocation in northern Tibet,Lunpola basin has a complicated and steep subsurface geologic formation.Due to its surface lithological diversity and great lateral change of its near-surface formation thickness and velocity,gathered single-shot disturbing wave is complex;seismic wave absorption attenuation is severe and data SNR is low as a whole.Therefore,the research is launched in tomographic static correction,fine velocity analysis and migration imaging method test.The application of the research makes the sectional SNR improve obviously,wave group characteristics clearer and imaging result of fault structure belt in Dayu Mountain improve significantly.
Under the control of major dislocation in northern Tibet,Lunpola basin has a complicated and steep subsurface geologic formation.Due to its surface lithological diversity and great lateral change of its near-surface formation thickness and velocity,gathered single-shot disturbing wave is complex;seismic wave absorption attenuation is severe and data SNR is low as a whole.Therefore,the research is launched in tomographic static correction,fine velocity analysis and migration imaging method test.The application of the research makes the sectional SNR improve obviously,wave group characteristics clearer and imaging result of fault structure belt in Dayu Mountain improve significantly.
引文
[1]陆基孟,王永刚.地震勘探原理(第三版)[M].北京:中国石油大学出版社,2008:190-191.
[2]林伯香,孙晶梅.几种常用静校正方法的讨论[J].石油物探,2006(4):369-370.
[2]林伯香,孙晶梅.几种常用静校正方法的讨论[J].石油物探,2006(4):369-370.
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