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文中介绍了用常规地震方法得到的记录质量很差或得不到记录地区的两条广角地震剖面。其中一条剖面是用12km窗口采集的,另一条剖面是用9.6km窗口采集的。这两条地震剖面都是沿纵测线按共炮检距绘制剖面图的方式记录下来的。窗口大于5km的广角剖面,在数据质量上要远远好于那些窗口为5km的常规剖面(因其在主要勘探目的层的深部地层中,难得出现任何可供解释的同相轴)。 在常规地震资料质量很差,以致无法进行勘探的差记录区或无记录区,广角记录技术可以作为一种供选择的方法替代常规记录技术。这类差记录或无记录地区一般都是出现在低速的目的层地区,其上覆盖有高速层。
In the paper, two wide-angle seismic sections with poor recording quality or no recording area obtained by conventional seismic methods are introduced. One of the profiles was collected using a 12km window and the other profile was collected using a 9.6km window. Both seismic profiles are recorded along the inline line by plotting the common offset. The wide-angle profile with a window larger than 5km is much better in data quality than those with a regular 5km profile because of its rare occurrence in the deep formations of the main exploration target. Wide-angle recording techniques can be used as an alternative to conventional recording techniques in poorly recorded, or unrecorded areas where conventional seismic data are of poor quality for exploration. These poorly documented or undocumented areas are generally found in low-speed destination areas, overlaid with high-speed layers.