【摘要】 鄂尔多斯盆地南部黄土塬区地表沟谷纵横,地貌复杂,高程变化剧烈,地表出露岩性复杂多变。采用弯宽测线观测方式可改善该区的激发接收条件,但在原始地震资料上,干扰类型多,静校正问题突出,采用常规处理方法得到的叠加剖面不能完全满足地质解释的需求。为此,本文针对弯宽测线剖面位置偏离地下实际反射点位置这一问题,利用合理的弯宽测线观测系统,确保CMP点的走向与测线走向基本吻合,从而达到最优叠加效果;针对干扰类型复杂这一问题,联合采用多种去噪方法进行去噪处理;针对复杂静校正问题,采用在微测井控制下的多种方法联合解决长波长静校正问题;采用速度分析和剩余静校正多次迭代方法解决信噪比低的问题。处理结果表明,采取上述针对性技术措施,可以使该区地震资料的信噪比、分辨率得到大幅度提高。更多还原

【Abstract】 The surface conditions for the Loess Plateau in the south of Ordos Basin are very complicated with many valleys,complex landforms and serve elevation change,the lithology of the outcrop changes greatly,the ignition and receiving conditions in this area can be greatly improved if the crooked wide line acquisition is applied,however there are many types of interference noises and sever static correction problem exists for the preliminary seismic data,as a result the stack sections from the routine processing methods can not meet the need of the geological interpretation.Regarding the fact in which the section location of the crooked wide line deviates the locations of the field subsurface reflection points,a reasonable geometry for the crooked wide line was applied,so the strikes of the CMPs and the lines could almost match with each other and the best stacking results can be achieved.For the complex types of the interference noises,several de-noising methods were jointly used,for the complicated static correction,the lengthy wavelength static correction problem was solved by applying several methods controlled by micro-well logging,the low signal to noise ratio problem was resolved by iteration method of velocity analysis and residual static correction.The processing results show that by application of the methods above,the signal tot noise ratio and the resolution of the seismic data in this area were greatly raised.更多还原