横波地震技术在伊敏一露天矿中的应用
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摘要
以伊敏煤田某露天煤矿横波地震勘探为例,介绍了制做适合野外施工的低噪声、大能量、且易于操作的横波震源的方法,并将各种特性的横波震源在不同介质中进行激发效果试验。根据试验结果确定了震源类型及数据采集参数,其中横波震源为12齿、重150kg、尺寸为110cm×90cm×20cm的爬钉型震板,在加载500kg的重物时耦合效果较好。横波资料的处理基本上与纵波处理的方法相同,由于该区反射波信噪比较高,区内地形平坦,静校正问题较易解决。在资料解释中利用反射波同相轴的形态,在时间剖面上圈定了断层、煤层冲刷带及煤层尖灭点的位置。另外应用速度谱资料求取的平均速度预测了该露天煤矿15、16煤的底板深度。
Taking the shear wave seismic prospecting in a surface coalmine in the Yimin coalfield as an example,introduced a shear wave source adaptable to low noise,large energy,and easy to operate in field operations,and tested shot effects of various characteristic shear wave sources in different media.Based on tested results have determined source type and data acquisition parameters.In which,the shear wave source is a 12 setoffs,weight 150kg,size 110cm×90cm×20cm nailed vibration plate,it has better coupling effect when 500kg weight is loading.Data processing is basically the same of compressive wave data,since the higher reflection S/N in the area and flat ground,thus easy statics.In data interpretation,reflection phase axis configuration has used to cycle out positions of faults,coal seam scouring belts and pinch out points on time sections.In addition floor depths of Nos.15 and 16 coal seams have been predicted through mean velocity from velocity spectrum.
Taking the shear wave seismic prospecting in a surface coalmine in the Yimin coalfield as an example,introduced a shear wave source adaptable to low noise,large energy,and easy to operate in field operations,and tested shot effects of various characteristic shear wave sources in different media.Based on tested results have determined source type and data acquisition parameters.In which,the shear wave source is a 12 setoffs,weight 150kg,size 110cm×90cm×20cm nailed vibration plate,it has better coupling effect when 500kg weight is loading.Data processing is basically the same of compressive wave data,since the higher reflection S/N in the area and flat ground,thus easy statics.In data interpretation,reflection phase axis configuration has used to cycle out positions of faults,coal seam scouring belts and pinch out points on time sections.In addition floor depths of Nos.15 and 16 coal seams have been predicted through mean velocity from velocity spectrum.
引文
[1]周绪文.反射波地震勘探方法[M].北京:石油工业出版社,1989.
[2]王振东.浅层地震勘探应用技术[M].北京:地质出版社,1994.
[3]郑兆兴.煤田地震横波勘探技术研究[R].江苏南京:中国煤田地质总局江苏物测队,1991.
[4]R H Tatham.υP/υS-潜在的油气显示[J].牛毓荃,译.石油地球物理勘探,1977.
[2]王振东.浅层地震勘探应用技术[M].北京:地质出版社,1994.
[3]郑兆兴.煤田地震横波勘探技术研究[R].江苏南京:中国煤田地质总局江苏物测队,1991.
[4]R H Tatham.υP/υS-潜在的油气显示[J].牛毓荃,译.石油地球物理勘探,1977.
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