井中激发地表接收的近地表结构调查方法
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摘要
横波静校正是影响多波地震勘探效果的重要因素。地震微测井技术是获得近地表结构直接而有效的手段,但由于存在震源和初至识别等问题,在多波勘探中的应用受到一定限制。为此,基于炸药震源产生横波的物理机理,提出了井中串状震源激发、地表三分量检波器多道接收的近地表结构调查方法,提出了基于地面纵向排列多道记录能量和时间信息,通过初至叠加扫描获得纵、横波近地表速度的方法。将该方法应用于四川广安地区的横波资料静校正处理,获得了理想的效果,成像质量得到了提高。
S-wave statics is an important influence factor for the effect of multi-wave seismic exploration.Seismic uphole survey is a direct and effective means for obtaining near-surface structure,but its application in multi-wave exploration is limited since the recognition of source and first break is difficult.Therefore,based on the physical mechanisms for dynamite source generating S-wave,a method was proposed to investigate the near surface structure shot by string source in borehole and received by multi-trace three-component geophone on surface.In addition,based on the energy and time information recorded by multi-trace surface longitudinal array,first break stack scanning was used to obtain near surface velocity of P-wave and S-wave.The method was applied to the statics of S-wave data at Guang'an,Sichuan.Ideal result was achieved,and imaging quality was improved.
S-wave statics is an important influence factor for the effect of multi-wave seismic exploration.Seismic uphole survey is a direct and effective means for obtaining near-surface structure,but its application in multi-wave exploration is limited since the recognition of source and first break is difficult.Therefore,based on the physical mechanisms for dynamite source generating S-wave,a method was proposed to investigate the near surface structure shot by string source in borehole and received by multi-trace three-component geophone on surface.In addition,based on the energy and time information recorded by multi-trace surface longitudinal array,first break stack scanning was used to obtain near surface velocity of P-wave and S-wave.The method was applied to the statics of S-wave data at Guang'an,Sichuan.Ideal result was achieved,and imaging quality was improved.
引文
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6张达敏,石瑞平.探索横波地震的理论误区[J].工程地球物理学报,2005,2(2):139-144
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2曹务祥,李海翔.横波微测井转换波静校正方法[J].勘探地球物理进展,2006,29(5):353-356
3 Heelan P A.Radiation from a cylindrical source of finit e length[J].Geophysics,1953,18(3):685-696
4 White J E,Sengbush R L.Shear waves from explosive source[J].Geophysics,1963,28(6):1001-1019
5戚敬华.纵横波地震综合勘探方法[A].岩性勘探课题组.煤田地球物理岩性勘探论文集[C].北京:煤炭工业出版社,1996.46-51
6张达敏,石瑞平.探索横波地震的理论误区[J].工程地球物理学报,2005,2(2):139-144
7曹务祥,周安国.一种新的波场分离方法[J].石油物探,1997,36(4):104-109
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