准噶尔盆地北缘二维地震资料的空变分析处理方法

准噶尔盆地北缘地表条件复杂，有沙漠、农田、砾石和基岩出露山体等。二维地震勘探测线跨越玛湖凹陷、克夏断阶带、哈山凸起与和什托洛盖沉积盆地等地下构造。由于地表高程起伏大，低、降速带速度和厚度变化剧烈，地下地质结构复杂，使得地震资料的属性存在较大的差异，采用常规方法处理效果不好。为此，从地震测线的地表结构和地下构造的研究入手，对不同地表条件下的地震资料特征进行分析，并根据分析结果采取针对性的处理措施，即对地震资料进行空间变化处理。处理结果表明，空间变化处理方法对地表条件复杂地区的资料有很好的处理效果，剖面的品质可以得到较大的提高，剖面的一致性好，反射同相轴连续，信噪比高。

A processingmethod about analyze spatial change on 2-D seismic data at the northern of Junggar basin.

In northern margin of Junggar Basin, the surface condition is complicated for it contains desert, cropland, gravel and the hill of basement cropping out, etc. There exist large differences between seismic attributes due to drastic variation of elevation, velocity and thickness of weathering zone. Therefore the effect of routine data processinhg is not satisfied. Based on the surface and subsurface structure, we carried out corresponding countermeasure according to the characteristics of seismic data, that is spatial change processing. The processing result shows that this method has satifying effect in complicated surface condition. Consistent event and high S/N ration have been obtained in the processed sections.