大吨位可控震源的应用及效果分析

Application and effect of the large-tonnage vibroseis

中小型可控震源的应用,弥补了炸药震源在地表条件差及城市环保区无法施工的缺陷,在中浅层勘探中取得了较好的效果,但是,对于目的层埋藏较深的地区和反射品质较差的戈壁砾石区,则效果不是太好。从可控震源与炸药震源的原理及优势对比入手,分析和比较大、中、小可控震源的技术方法,并在新疆焉耆盆地二维采集中使用这三种震源进行试验,结果说明在目的层埋藏较深的地区和反射品质较差的戈壁砾石区,只有使用大吨位可控震源才能取得高品质的地震资料。

Small and medium size vibroseis has been successfully used to generate quality data from shallow to middle depth in areas with unfavorable surface conditions and environment-protected regions adjoining to cities. However, it fails to generate desirable data in areas with deep targets and in serir and shingle zones. Beginning with a comparison between vibroseis and dynamite sources on their principles and advantages, this paper compared the fundamentals of vibroseis of large, medium, and small sizes. These three different sizes of vibroseis were used in 2-D seismic data acquisition in Yanqi Basin. The results show that only large-tonnage vibroseis can yield quality seismic data in areas where targets are buried deeply, or in the serir and shingle zones.