Muting the noise cone in near‐surface reflection data: An example from southeastern Kansas
Muting the noise cone in near‐surface reflection data: An example from southeastern Kansas
复制标题
减弱近地表反射数据中的噪声锥：来自堪萨斯州东南部的示例
作者：
G. Baker;D. Steeples;M. Drake
在堪萨斯东南部采集了300 m近地表地震反射剖面，以确定与未暴露基岩区域两侧已识别地层偏移相关的断层。通过屏蔽所有在空气波之后及时到达的数据，最终叠加部分的S/N比得到了大幅提高。将传统的地震数据处理技术应用于近地表数据（200毫秒或更少的数据）的方法通常与油气勘探规模的处理（3-4毫秒或更多的数据）显著不同。所使用的噪声锥静音的示例与包括包含信号的所有数据的正常勘探规模地震数据处理原理相反。应用于数据的噪声锥静音去除了总数据量的三分之一以上，其中一些包含信号。然而，在这种情况下，严重的静音导致最终叠加部分中的信噪比较高，即使在静音数据中可以识别出一些信号。这个例子支持的建议，非传统技术有时需要考虑处理近地表地震数据时。
A 300-m near-surface seismic reflection profile was collected in southeastern Kansas to locate a fault(s) associated with a recognized stratigraphic offset on either side of a region of unexposed bedrock. A substantial increase in the S/N ratio of the final stacked section was achieved by muting all data arriving in time after the airwave. Methods of applying traditional seismic data processing techniques to near-surface data (200 ms of data or less) often differ notably from hydrocarbon exploration-scale processing (3-4 s of data or more). The example of noise cone muting used is contrary to normal exploration-scale seismic data processing philosophy, which is to include all data containing signal. The noise cone mute applied to the data removed more than one-third of the total data volume, some of which contains signal. In this case, however, the severe muting resulted in a higher S/N ratio in the final stacked section, even though some signal could be identified within the muted data. This example supports the suggestion that nontraditional techniques sometimes need to be considered when processing near-surface seismic data.