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由于地下浅部低速层对地震波能量的吸收,致使传统的陆上地震资料质量较差。这些低速带产生的地滚波及静校正问题干涉了一次反射资料。同时,由于采样不足、耦合差及多分量检波器组合定位不准导致资料信噪比低。本文将说明垂直电缆(VC)技术是如何解决这些问题的。 VC技术在海洋勘探中的应用获得了令人鼓舞的结果(例如,Guimaraes,1998;Krail,1994),我们感到此技术应用于陆上勘探会明显改善资料的质量。陆上VC可被描述为多次勘探,多炮检距移动源垂直地震剖面方法(图1)。垂直检波器排列以特定的间隔置于井中,与VSP中的放置一样。多分量检波器被耦合在井壁上,地面激发。VSP的目的是接收井附近的反射,但是VC的目的是按照传统的地表地震勘探的方式对整个
Due to the absorption of seismic wave energy by the low-velocity underground shallow layer, the quality of the traditional onshore seismic data is poor. The ground roll and static correction problems caused by these low-speed bands interfere with the reflection data. At the same time, due to lack of sampling, poor coupling and multi-component geophone positioning are not allowed to lead to low data to noise ratio. This article explains how vertical cable (VC) technology addresses these issues. Encouraging results have been achieved in the application of VC technology in marine exploration (eg Guimaraes, 1998; Krail, 1994) and we feel that this technology for onshore exploration will significantly improve the quality of the data. Terrestrial VC can be described as multiple exploration, multi-offset moving source vertical seismic section method (Figure 1). The vertical detector arrangement is placed in the well at specific intervals, just as in the VSP. Multi-component geophones are coupled to the borehole wall to stimulate the ground. The purpose of the VSP is to receive reflections near the well, but the purpose of the VC is to follow the traditional surface seismic exploration of the entire