| 鄂尔多斯盆地低信噪比复杂地区检波器组合方法分析 |
| |
| 引用本文： | 王正良,肖国强,付群礼,吕震川,姚宗惠,史庆阳,高斌,伊鸿斌,高强,张鹏,侯杰,史炳程,王彦铎,焦桂行.鄂尔多斯盆地低信噪比复杂地区检波器组合方法分析[J].煤田地质与勘探,2021,49(2):225-233. |
| |
| 作者姓名： | 王正良 肖国强 付群礼 吕震川 姚宗惠 史庆阳 高斌 伊鸿斌 高强 张鹏 侯杰 史炳程 王彦铎 焦桂行 |
| |
| 摘 要： | 在鄂尔多斯盆地西北部，低信噪比复杂地区存在严重的随机干扰，这导致该区地震资料信噪比很低。在不提高覆盖次数情况下，针对该区造成地震资料信噪比低的严重随机干扰问题，开展检波器组合压制随机干扰的方法研究。研究了随机干扰对动静校正量准确求取的影响，检波器组合对干扰波的压制作用，组内高差和组合基距对地震采集资料高频的影响，对比分析检波器组内距对随机干扰的衰减效果。研究结果表明:在盆地低信噪比复杂地区，野外检波器组合重点压制严重的随机干扰波，提高地震资料信噪比；小于1 m的检波器组内高差对该区地震采集资料110 Hz以下高频成分影响有限，小于13 m组合基距对中、深目的层地震资料70 Hz以内频率影响有限；理论计算和试验资料综合确定的随机干扰半径为1.7~2.0 m，大于随机干扰半径的检波器组合内距能有效压制随机干扰波，其中组内距3 m比较稳定；以上参数确定的检波器组合接收方法压制随机干扰波后，所得到的地震单炮记录相比单点接收、高覆盖次数压制随机干扰波所得到的资料在70 Hz有限频带内更能提高信噪比、频率，而且成本相对低。该结果在鄂尔多斯盆地低信噪比复杂地区地震勘探野外采集中具有指导作用。
|
| 关 键 词： | 检波器组合 随机干扰波 组内高差 组合基距 低信噪比复杂地区 鄂尔多斯盆地 |
| 收稿时间： | 2020-05-11 |
Analysis of geophone array method in low SNR complex area of Ordos Basin |
| |
| Abstract: | In the northwest of Ordos Basin, there is serious random interference in the complex area, which leads to the low signal-to-noise ratio of seismic data in this area. In order to solve the problem of low signal-to-noise ratio(SNR) of seismic data in this area, a method study of suppressing random interference by geophone array is carried. The influence of random interference on the accurate calculation of NMO correction and static correction, the suppression of interference wave by geophone array, the influence of intra group height difference and array base distance on high frequency of seismic acquisition data are studied, and the attenuation effect of geophone array internal distance on random interference is compared and analyzed. The results show that: in the area with low signal-to-noise ratio in the basin, the field geophone array mainly suppresses the serious random interference wave and improves the signal-to-noise ratio of seismic data; the height difference of geophone array less than 1 m has limited influence on the high-frequency components below 110 Hz of the seismic acquisition data in this area, and the base distance less than 13 m has limited influence on the frequency within 70 Hz of seismic data of medium and deep target layers; The random interference radius determined by theoretical calculation and experimental data is 1.7-2.0 m. the inner distance of geophone array larger than the random interference radius can effectively suppress the random interference wave, among them, the effect of the geophone group inner distance of 3 m is more stable. The results show that the method of geophone array receiving with the above parameters can improve the signal-to-noise ratio and frequency in the limited frequency band of 70 Hz, and the cost is relatively low. This conclusion has a guiding role in seismic exploration field acquisition in low SNR complex area of Ordos Basin. |
| |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《煤田地质与勘探》浏览原始摘要信息 |
| 点击此处可从《煤田地质与勘探》下载免费的PDF全文 |
|
