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在加拿大的阿尔伯坦及萨斯卡彻温推行了一项试验计划:采用一种包括气振、数字记录仪及数字回放系统来解决一些勘探问题。几哩长度的资料是从下列三个地区收集并加以整理的,它们是:阿尔伯坦的埃德桑和贝尔斯希耳湖;萨斯卡彻温中部。在应用低功率、低频的地面振源时,必须考虑在其中存在的几种情况。这就是背景干扰和规则噪音的压制,反射波同相轴的分辨力和地层的穿透深度。在不同的地点,利用各种野外和回放整理的方法,这些问题都得到了克服。克服的方法包括:在每个激发点得到的多个信号的迭加,适当选择振源和检波器的组合,共反射点技术以及回放整理过程中反褶积、速度和频率滤波的应用。资料整理以后表明,萨斯卡彻温中部的气振地震记录道在20—65赫频率范围内与合成地震记录是符合的。在贝尔斯希耳湖和埃德桑,整理后的气振地震记录剖面和炸药震源的地震记录相比,表明气振资料在上述两地区是可以解决地质问题的。一系列结果是充满着希望的。再考虑到有利的经济因素,就能保证气振在加拿大的进一步应用。
A pilot project was implemented at Alberta and Saskatchewan, Canada: to solve some of the exploration problems using an air vibration, digital recorder and digital playback system. A few miles of length were collected and collated from the following three areas: Edsan and Bethlehem Lakes in Alberta; Saskatchewan Central. In the application of low-power, low-frequency ground vibration source, we must consider the existence of several situations. This is the suppression of background disturbances and regular noise, the resolution of reflected waves and the penetration depth of the formation. In different locations, the use of a variety of field and playback finishing methods, these problems have been overcome. Methods to overcome include the superposition of multiple signals at each excitation point, the proper selection of source and detector combinations, the common reflex point technique, and the application of deconvolution, velocity and frequency filtering in the playback collating process. Data processing showed that the gas-vibrating seismograms from the Saskatchewan center were consistent with synthetic seismograms over the frequency range of 20-65 Hz. Comparisons of seismogenic seismograms and explosives seismograms recorded in the Beershirter and Edson show that the airborne data can be used to solve geological problems in these two regions. A series of results is full of hope. Taking into account the favorable economic factors, can ensure the further application of gas vibration in Canada.