巨厚黄土覆盖区表层地震信号衰减测量
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摘要
塔西南黄土地震勘探是一个世界性技术难题,形成该难题的最关键因素是巨厚黄土覆盖区表层低降速带对地震信号的严重衰减。为此,针对塔西南盆地柯东构造巨厚黄土覆盖区的地质情况,利用通信中信号系统传输原理,提出了一种利用VSP和微测井信息分析该区低降速带地震信号衰减规律的方法,并通过详细的理论推导和试验检验了该方法的有效性,揭示了地震信号在黄土低降速带传播时的衰减规律。
Seismic exploration of loess in southwestern Tarim Basin is a worldwide tough problem. The key factor is a heavy attenuation of seismic signal induced by low-velocity layer of the surface in very-thick-loess-covering area. Therefore, in this study, according to the geologic condition of Kedong structure in the area and the signal transmission principle, a method using VSP and micro-logging data has been put forward to analyze the attenuation law. Through a detailed theory deduction and some experiments, the validity of the method has been verified. The attenuation law of seismic signal in low-velocity layer of loess is revealed also.
Seismic exploration of loess in southwestern Tarim Basin is a worldwide tough problem. The key factor is a heavy attenuation of seismic signal induced by low-velocity layer of the surface in very-thick-loess-covering area. Therefore, in this study, according to the geologic condition of Kedong structure in the area and the signal transmission principle, a method using VSP and micro-logging data has been put forward to analyze the attenuation law. Through a detailed theory deduction and some experiments, the validity of the method has been verified. The attenuation law of seismic signal in low-velocity layer of loess is revealed also.
引文
[1]李子顺.地震波衰减规律及其恢复方法[J].地球物理学进展,2007,10(5):1545-1551.
[2]Jiri Zahradrik,etc.Influence of geogical factros on seismicg round motions[J].study Geophysics,1981,25(4):343-355.
[2]Jiri Zahradrik,etc.Influence of geogical factros on seismicg round motions[J].study Geophysics,1981,25(4):343-355.
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