复杂地表初至层析地震静校正技术及其应用
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摘要
复杂地表条件的煤层气地震勘探资料处理对静校正有较高要求。折射静校正具有较好的静校正效果,但对于地表起伏大、纵横向速度变化剧烈的复杂地区则难以取得较好的效果。建立横向速度变化大且基岩裸露的地震模型进行理论试算,分析了层析静校正的特点及适用条件,指出了层析静校正中应该注意的关键问题。实例验证结果表明:层析静校正更适合复杂地表煤层气地震资料的处理。
Refraction static technology has good effect on statics correction,but it is difficult to get preferable effect in the complex region with rolling suface and dramatic velocity changes in vertical and horizontal direction.A forward model with large horizontal velocity change and bared bedrock was built and computed in t his paper to analyze the characteristics and application conditions of tomographic static correction.The key problems of tomographic statics we should pay attention to were pointed out.The results showed that tomographic static correction method was more suitable for coalbed methane seismic data processing of areas with complex surface,which has significant meaning for improving precision of coalbed methane seismic exploration.
Refraction static technology has good effect on statics correction,but it is difficult to get preferable effect in the complex region with rolling suface and dramatic velocity changes in vertical and horizontal direction.A forward model with large horizontal velocity change and bared bedrock was built and computed in t his paper to analyze the characteristics and application conditions of tomographic static correction.The key problems of tomographic statics we should pay attention to were pointed out.The results showed that tomographic static correction method was more suitable for coalbed methane seismic data processing of areas with complex surface,which has significant meaning for improving precision of coalbed methane seismic exploration.
引文
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[14]BISHOP T N,BUBE K P,CUTLER R T,et al.Tomographic de-termination of velocity and depth in laterally varying media[J].Geophysics,1985(50):903-923.
[2]刘贻军,娄建青.中国煤层气储层特征及开发技术探讨[J].天然气工业,2004,24(1):68-71.
[3]张新民,解光新.我国煤层气开发面临的主要科学技术问题及对策[J].煤田地质与勘探,2002,30(2):71-78.
[4]杨立雄.我国煤层气勘探存在的问题及其建议[J].中国煤炭,2004,30(3):48-49.
[5]苑益军.复杂地表地区静校正技术应用研究[D].北京:中国地质大学,2003.
[6]张印堂.折射层析反演静校正及其在伊朗卡山地区的应用[J].油气地球物理,2005,3(3):11-14.
[7]张建中.近地表介质地震初至波层析成像[J].厦门大学学报(自然科学版),2004,43(1):63-66.
[8]张丽.复杂地区静校正技术研究[D].西安:长安大学,2006.
[9]DINES K A,LYTLE R J.Computerized geophysical tomography[J].Proc.IEEE,1979(67):1065-1073.
[10]MCMECHAN G A.Seismic tomography in boreholes[J].Geo-phys.J.Roy.Astr.Soc.,1983(74):601-612.
[11]SOMERSTEIN.Radio-frequency geotomography for remotely probing the interior of operating mini and commercial sized oil-shale retorts[J].Geophysics,1984(49):1288-1300.
[12]DAILY W D.Underground oil-shale retort monitoring using geotomography[J].Geophysics,1984(49):1701-1711.
[13]DYER B C,WORTHINGTON M H.Seismic reflection tomogra-phy:a case study[J].First Break,1988(6):3354-3366.
[14]BISHOP T N,BUBE K P,CUTLER R T,et al.Tomographic de-termination of velocity and depth in laterally varying media[J].Geophysics,1985(50):903-923.
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