宁夏石槽村井田地震勘探难点及对策
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摘要
宁夏石槽村井田地震勘探区,地表为风成垄状及新月形流动沙丘,其疏松的沙丘对地震波能量及频率吸收衰减强烈,噪声干扰强,严重降低了资料的信噪比及分辨率,且起伏的沙丘引起的静校正问题也较突出。对此提出了以提高煤层反射波信噪比为主要目的,以提高小断层识别能力为目标的勘探方法,如:高覆盖次数、高频激发、组合检波器面积接收等野外数据采集技术,以及动校正、静校正、子波一致性处理、叠前串联反褶积处理、子波压缩等一系列地震资料处理技术。与原详查成果比较,该区三维地震勘探新发现断层15条,背向斜3个。地震勘探成果表明,针对该沙漠区采取的一系列技术措施,可获得较好的勘探效果。
The ground surface of the Shicaocun minefield,Ningxia is covered by eolian longitudinal and barchan dunes,the loose dunes can seriously absorb seismic wave energy and frequency;bring about strong noise interferences.Thus follow serious data S/N ratio and resolution reductions,also evident static correction issues caused by undulant dunes.By this,exploration methods to improve coal seam reflection S/N ratio for more effective minor fault identification ability put forward.Such as field data acquisition techniques of more than ever folds,higher frequency shot,areal geophone array receiving,and a series of seismic data processing techniques of dynamic correction,static correction,wavelet consistency processing,prestack serial deconvolution processing and wavelet compression etc.Compared with results of original preliminary exploration,the 3D seismic prospecting in the area has found new 15 faults and 3 folds.The result has demonstrated that,a series of technical measures suit to desert area can obtain rather good exploration effect.
The ground surface of the Shicaocun minefield,Ningxia is covered by eolian longitudinal and barchan dunes,the loose dunes can seriously absorb seismic wave energy and frequency;bring about strong noise interferences.Thus follow serious data S/N ratio and resolution reductions,also evident static correction issues caused by undulant dunes.By this,exploration methods to improve coal seam reflection S/N ratio for more effective minor fault identification ability put forward.Such as field data acquisition techniques of more than ever folds,higher frequency shot,areal geophone array receiving,and a series of seismic data processing techniques of dynamic correction,static correction,wavelet consistency processing,prestack serial deconvolution processing and wavelet compression etc.Compared with results of original preliminary exploration,the 3D seismic prospecting in the area has found new 15 faults and 3 folds.The result has demonstrated that,a series of technical measures suit to desert area can obtain rather good exploration effect.
引文
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[7]李新安.高分辨率地震技术在宁东煤田构造勘查中的应用[J].中国煤田地质,2009,21(07).
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