准噶尔盆地腹部沙漠区组合井拆分技术研究

Dividing technique of array shooting wells in desert area of Jungger Basin

在地震数据低信噪比地区,通常采用多井组合的强化激发方案,可以在一定程度上提高地震单炮记录的信噪比,但由于井数多、激发成本高,很难实施高密度激发,因而影响了最终的成果数据体品质的改善。在准噶尔盆地腹部沙漠区,开展了组合井拆分激发的试验,重点对比分析了少井组合、高覆盖叠加与多井组合、低覆盖叠加两种试验,对试验段资料的室内对比处理采用相同流程,通过剖面效果分析,总结出优化组合井激发方法的组合井拆分技术。

Array of seismic shooting wells is usually used to get seismic data at areas of low signal-to-noise(S/N)ratio.This method can improve S/N of common shot records,but shooting scheme with high density is difficult to put into production because of its cost.At Jungger Basin we carried out the test on dividing one group of shooting wells into two or separating those into several small arrays,and each small array is taken as one shooting point to get a seismic record.We examined the difference between seismic data before dividing(with 100 folds from 12 shooting wells)and that after dividing(with 200 folds from 6 shooting wells).The results indicate that the resolution and S/N after dividing are better than those before dividing.