准噶尔盆地腹部沙漠区组合井拆分技术研究
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摘要
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.
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.
引文
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6曹务祥.可控震源使用误区分析[J].石油地球物理勘探,2006,41(3):341～345
2黄洪泽.沙漠区地震方法的改进[J].新疆石油地质,1988,9(4):31～38
3陆基孟.地震勘探原理[M].山东东营:石油大学出版社,1993.130～190
4傅朝奎,唐建人,李勤学,等.利用联合组合效应提高地震资料的信噪比和分辨率[J].石油地球物理勘探,2000,35(2):236～243
5安树杰,孙梦,王新全,等.库木塔克沙漠巨厚风成沙区三维地震采集方法及效果[J].天然气工业,2007,27(增刊A):31～33
6曹务祥.可控震源使用误区分析[J].石油地球物理勘探,2006,41(3):341～345
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