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野外地震施工中,常发现所记录的井口时间和估计值相差很大,达十至数十毫秒,而且有的超前有的落后.据了解,无论是石油部还是地矿部,也不论是进口的DFS-V、SN338HR,还是国产数字磁带地震仪,都不同程度地存在这一问题.到底是什么原因导致井口时间误差这么大呢?下面,根据野外专门针对这一问题所做的试验,谈谈几点不成熟的看法,供参考.(一)、来自井口检波器的井口信号井非如某些同志所说的是一个阶跃式的,也不是脉冲式的,而是一个由小渐渐变大,再山大渐渐变小的地震波,如图豆所示.
Field earthquake construction, often found wellhead time recorded and estimates vary widely, up to tens to tens of milliseconds, and some ahead of some backward.It is understood that, whether it is the Ministry of Oil or the Ministry of Mines, whether imported Of the DFS-V, SN338HR, or domestic digital tape seismograph, are to varying degrees this problem exists in the end is what causes the wellhead time error so much? Hereunder, according to the field specifically for the test of this issue, (1) The wellhead signal well from the well head geophone is not a step-by-step or some pulse-like one, as some comrades said, Larger, then gradually smaller mountain seismic waves, as shown in Figure beans.