Research on the application of mixed source data matching processing technology in 3D seismic exploration of coal field
Received date: 2024-01-06
Online published: 2024-12-19
Copyright
A coal mine in Huaibei, Anhui Province, is carrying out a 3D seismic survey of the coalfield, using a combination of explosive seismic source and vibroseis to collect seismic data. There are differences in phase, frequency and signal-to-noise ratio between two sources, especially in the same offset take-off time of two sources. In order to solve this problem, first, we investigate the polarity of two kinds of vibroseis, reverse the polarity of vibroseis, make the polarity of the two kinds of vibroseis keep the same on the phase of data acquisition, and then use the matched filtering technology, the data of vibroseis are processed by matching filter, so that the two vibroseis keep the same phase and frequency, and the first arrival of vibroseis is easy to be identified and picked up automatically. The same offset take-off time of two kinds of vibroseis data after matching processing is investigated, and it is found that the two kinds of data have large systematic time difference, The first break is picked up after the time difference correction of the vibroseis data. Finally, the tomographic statics method is used to solve the statics problems caused by near-surface and time difference correction in the exploration area. After polarity reversal, matched filtering, time difference correction and tomographic static correction, the continuity of coal seam wave group at different seismic source splicing is improved, it lays a good foundation for the further processing of the later data, and the application effect is good. The method used in this paper will be the key technology of mixed source acquisition data processing, which has important research significance and application value.
Lian LIU , Song CHEN , YuLing WANG , YiFei XIAO , HongBo YUE . Research on the application of mixed source data matching processing technology in 3D seismic exploration of coal field[J]. Progress in Geophysics, 2024 , 39(5) : 1951 -1962 . DOI: 10.6038/pg2024HH0498
表1 三维测线观测系统参数表Table 1 Parameter table of three-dimensional line observation system |
| 观测系统类型 | 规则束状14线27炮中间激发 |
| 接收道数/道 | 128×14=1792 |
| 检波线数/条 | 14 |
| 接收道距/m | 10 |
| 检波线距/m | 60 |
| 叠加次数 | 8×9=72次(纵向8次,横向9次) |
| CDP网格/(m×m) | 5×10 |
| 纵向最大炮检距/m | 640 |
| 横向最大炮检距/m | 770 |
| 纵向最小炮检距/m | 0 |
| 横向最小炮检距/m | 10 |
| 炮点工作量/炮 | 1892 |
图5 子波显示(a)可控震源子波;(b)炸药震源子波;(c)匹配滤波后可控震源子波. Fig 5 Wavelet display of different sources (a)Vibroseis wavelet; (b)Explosive vibroseis wavelet; (c)Vibroseis wavelet after matched filtering. |
图6 反褶积后子波(a)反褶积后炸药震源子波;(b)反褶积后可控震源子波. Fig 6 Wavelet display after deconvolution (a)Explosive source wavelet after deconvolution; (b)Vibroseis wavelet after deconvolution. |
图12 层析静校正前后叠加剖面显示(a)原始叠加;(b)静校正叠加;(c)时差校正后叠加;(d)时差校正+静校正叠加. Fig 12 Stacking sections before and after tomographic static correction (a)Original stacking section; (b)Static correction stacking section; (c)Time difference correction stacking section; (d)Time difference correction+static correction stacking section. |
感谢审稿专家提出的修改意见和编辑部的大力支持!
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