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在地震勘探中,鄂尔多斯盆地伊陕斜坡苏里格西地区的第四纪小型河湖沉积盆地会产生一种强干扰波.为了探索该干扰波特征及形成机理,通过对大量的试验资料对比分析,综合研究了该沉积体的沉积规律、岩性特征及干扰波速度特点,频谱特性和时距曲线.结果表明,该干扰波形成机理有如下特点:(1)该干扰波能量强,呈“八字胡”状;(2)该沉积体为第四纪河湖相沉积,岩性、速度成层分布,是形成该干扰波主要原因;(3)该干扰波频谱在0~300 Hz,近道主频在50 Hz,中道主频在65Hz,远道主频在20Hz,第270道高频主瓣在870ms,中低频主瓣在920ms;(4)干扰波时距曲线为双曲线.
In seismic exploration, the Quaternary small rivers and lakes sedimentary basins in the Suligexi area of Yi-Shan slope in Ordos Basin will produce a strong interference wave.In order to explore the characteristics and formation mechanism of this interference wave, a large number of experimental data are contrasted and analyzed , The depositional characteristics, lithology characteristics, the characteristics of the disturbing wave velocity, the spectral characteristics and the time-distance curve of the sedimentary body are comprehensively studied.The results show that the formation mechanism of the disturbing wave has the following characteristics: (1) The energy of the disturbing wave is strong, (2) The sedimentary body is the main reason for the formation of this interference wave due to the sedimentary, lithologic and velocity stratigraphic distribution of Quaternary rivers and lakes; (3) The frequency spectrum of the interference wave is between 0 Hz and 300 Hz , The main frequency of the near channel is 50 Hz, the main channel frequency of the middle channel is 65 Hz, the main frequency of the far channel is 20 Hz, the main lobe of the 270th high frequency is 870 ms, and the main lobe of the middle and low frequency is 920 ms. (4) Interference wave time-distance curve is hyperbolic.