准噶尔盆地沙漠区延迟爆炸激发正演模拟分析

Forward modeling on delayed blast in the desert area of Junggar basin.

中国石油勘探开发研究院物探技术研究所, 北京100083

Department of Petroleum Geophysics Technique Research,Research Institute of Petroleum Exploration and Development,Beijing 10083,China

为了提高准噶尔盆地腹部沙漠区的地震资料品质,开展了激发参数优化设计研究。为了克服单深井激发在施工成本和施工效率上的不足,借鉴东部地区多年来开展延迟爆炸的成功经验,采用延迟爆炸的方法,结合准噶尔盆地沙漠区表层地质结构特征,进行了延迟爆炸正演模拟分析。通过正演模拟,就延迟爆炸激发时所得地震波的主频、频带宽度和激发能量等方面展开了分析。研究结果表明：与单深井激发相比,相同药量条件下,采用延迟爆炸激发方式可有效提高地震波主频,拓宽地震波频宽,增大地震波下传能量,对准噶尔盆地开展高分辨率地震勘探有较好的实际意义。

The optimal design for shooting parameters is carried out ai-ming at the problem of low amplitude traps and difficult in recog-nizing the reservoir lithology in Junggar basin.In order to over-come the restrictions of cost and efficiency in a single deep well shooting,the delayed blast with successful experience in east China is adopted in this area.Based on the surface geological configura-tion features in the desert of Junggar basin,the forward modeling on delayed blast is performed.During the delayed blast,the domi-nant frequency,frequency bandwidth and shooting energy of the seismic waves are analyzed through forward modeling.The results show that,compared to shooting by single deep well,with the same amount of explosive,the delayed blast shooting can effective-ly enhance the dominant frequency,widen frequency bandwidth, strengthen down going energy.So it is of important significance to carry out high resolution seismic prospecting in Junggar basin.