地震精细勘探

FINE SEISMIC SURVEY

为了消除井、炮坑深度等因素造成的时差影响,从而使得共中心点道集內各道反射层信号自激自收时间相同,达到同相叠加之目的,需要做两方面工作。一方面,切实按照勘探规程要求,确保野外施工精度,炮点、检波点施工位置准确,井、坑深度记录准确,使得物理点施工高程与测量成果相符;另一方面,在室內资料处理过程中,除了应用静校正资料消除低、降速带对地震资料的影响外,还需要根据班报记录消除井、坑深度时差对地震资料造成的影响,从而提高资料信噪比和分辨率。

In order to reduce the time difference effect caused by well and shot hole depth etc, so in-phase seismic wave can be stacked, two parts of work need to be done. On one hand, field operation must be carried out strictly according to the rules of exploration survey to ensure the accuracy of field operation and the precise of shot point and geophone station position, so that the field operation elevation equals to the measured one; on the other hand, during data processing, besides static correction data is used to eliminate the effect of low velocity layer on seismic data, the observer report is also added to remove the effect of well, hole depth interval transit time on seismic data, this way the signal to noise ratio (S/N),and resolution of data can be improved.