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水库大容量气枪震源激发条件优化实验研究
陈惠芳1) 林彬华1,2) 金星1,2) 巫立华1) 蔡辉腾1)
1)福建省地震局,福州市华鸿路7号 350003;2)中国地震局工程力学研究所,哈尔滨 150080
摘要:
通过人工拾取震相,统计记录台站数、台站最远观测距离、接收能量等3个参数,自主研发了最优工况处理软件来研判工况激发效果,并确定棉花滩水库最优工况为水深25m,枪阵沉放深度9m,枪阵尺寸7m*7m。同时对定点300次激发的每10次累计叠加结果进行分析,结果表明,叠加10~90次时激发效果快速增强,叠加100~150次时缓慢增强,叠加160~240次时快速增强,叠加250~300次时缓慢增强。由此研判,随着叠加次数的增加,激发效果增强,传播距离和记录台数也逐步增加。
关键词:  最优工况  叠加分析  激发效果  观测距离
DOI:
分类号:
基金项目:
An Experimental Study on Optimization of Large-volume Airgun Source Excitation Conditions in a Reservoir
Chen Huifang1) , Lin Binhua i1) , Jin Xing1,2) , Wu Lihua1) , and Cai Huiteng1)
1) Earthquake Administration of Fujian Province, Fuzhou 350003, China;2) Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China
Abstract:
Through manual pickup of seismic phases, the number of recording stations, the farthest observation distance of station and received energy are determined, then optimal operating condition processing software is developed to evaluate the excitation effect of operating conditions. The optimal operating conditions in the Mianhuatan Reservoir are determined using this software. They are: optimal water depth 25m, airgun array sink depth 9m and airgun array size 7m × 7m. At the same time, accumulative stacking results for every 10 times are analyzed for 300 fixed-point excitations. It is concluded that the excitation effect shows a rapidly rising trend at 10 to 90 times stacking, a slowly rising trend at 100 to 150 times stacking, a rapidly rising trend at 160 to 240 times stacking, and a slowly rising trend at 250 to 300 times stacking. As the number of stacking increases, the propagation distance and the number of recording stations also increase gradually.
Key words:  Optimum operating condition  Stacking analysis  Excitation effect  Observation distance.