高频随机噪声的三分量测定

高频噪声是地震高分辨率勘探的大敌。尤其对石油勘探的陆上地震资料来说，更是严重的问题。需要深入了解它的特点，以使找出相应的措施，尽量地克服这种干扰。

Three-component determination of high-frequency random noises

In high-resolution seismic exploration, high-frequency random noises are a formidable problem especially for land seismic data of oil exploration. It is essential to thoroughly understand its feature so as to find corresponding measures to eliminate the disturbance as far as possible. The author conducts a meaningful test through "the super microspread" of three-component geophones with the group interval being 20cm. It is demonstrated that the resonance phenomenon produced by the geophone-ground coupling is the main factor of causing the microseism. So the production mechanism of high-frequency disturbance is expounded tentatively. Three-component determination results show that the vibration direction of highfrequency disturbing wave is close to the horizontal plane and the vibration along x and y direction is much larger than that along z direction. Therefore the use of the conventional vertically sensitive velocity geophone is a correct selection. "The super microspread" can be used to analyze the geophone coupling resonance situation and directly observe the time-domain waveform of the coupling resonance.