可控震源滑动扫描采集方法

利用“滑动扫描”方法可以节省可控震源在进行地震勘探时所需的费用和时间。这种勘探方法首先由阿曼石油发展公司提出并进行了试验,其最大的特点就是不必等待前一组震源扫描完全结束,另一组震源即可开始新的振动扫描,在对地震资料进行有时间-频率滤波作用的相关处理过程中,将得到炮点单张记录,并可缩短震源施工时间,提高工作效率。其不足在于可能增加可控震源信号畸变的负面影响。但不会对记录品质形成大的影响。如果将这种方法真正用于野外勘探施工,还需对采集系统的部分硬件做一些改进。

Slip-sweep acquisition.

Tremendous cost reductions in vibroseis surveys could be achieved by employing slip-sweep method. This simple method was recently developed and tested by Petroleum Development Oman. The method con-sists of a vibrator group sweeping without waiting for the previous group's sweep to terminate. Correla-tion, which acts as a time-frequency filter, will then extract individual records. With slip-sweep recording the cycle time can be reduced dramatically. The only disadvantage of the method is that negative impact of vibrator distortion is increased. But the method does not cause data deterioration. It can only be used in production mode if some modifications are made to acquisition hardware. These modifications are proposed in this paper.