电火花震源在平原水域区地震采集中的应用及效果分析

Application and effect analysis of sparker in seismic acquisition in plain water area

胜利油田东部陆上探区地表以平原为主,区内多分布有大型的饮用水水库.水库内的地震勘探工作受制于激发问题没有得到很好的解决,造成了资料缺失.近两年来,在水库中引入大功率电火花震源进行激发,电火花震源的激发效果受发射能量和放电电极沉入水中深度等因素影响,本文分析对比了电火花震源不同发射能量和电极沉水深度的试验单炮,结果表明:资料品质随着输出能量的增加而变好;在电极沉入水中2 m时激发效果最好,从而确定了电火花震源在水域中激发的最佳因素.通过激发后得到的叠加剖面分析,地震资料的品质较高,有效的弥补了水库中资料的缺失,取得了较好的效果.

In the eastern part of Shengli Oilfield,the surface of the exploration area is dominated by the plain,and there are lots of large reservoirs.The lack of the datum in the reservoirs has not been resolved because of the problem of the source.In recent years,we have used the high-power sparker in the reservoirs and the effects of the sparker are influenced by the energy of the excitation and the depth of the electrode.This paper analyses and compares the test records of the different energies of the excitation and the depths of the electrode.The results indicate that the quality of the datum gets better with the increase of the output energy,and the best depth of the electrode in the water is two meters.Based on the conclusions we get the optimal factors of the excitation.By the analysis of the stack sections we can find that the high quality of the datum makes up the missing datum of the reservoirs and gain the preferable results.