重锤行程和震动泵排量对震源低频出力扩展的制约  

Constraints on the extension of the low-frequency output of vibrator by the mass stroke and the displacement of a vibration pump

作　　者：勾皞 梁福河 赵东军 王永芳[2] 季颖 GOU Hao;LIANG Fuhe;ZHAO Dongjun;WANG Yongfang;JI Ying

机构地区：[1]中国石油集团东方地球物理勘探有限责任公司英洛瓦(天津)物探装备有限责任公司,河北涿州072750 [2]中国石油集团东方地球物理勘探有限责任公司装备服务处,河北涿州072750

出　　处：《物探装备》2023年第6期391-394,403,共5页Equipment for Geophysical Prospecting

摘　　要：扩展可控震源低频扫描频率能有效提高资料品质,但扩展低频时受到重锤行程和震动系统液压排量两个因素的限制,重锤行程和频率平方成反比,排量和频率成反比。所以,首先是重锤行程的限制,重锤行程严重限制了低频出力大小,为了兼顾高频,一般重锤行程不会太大,目前最大20 cm左右;其次是震动系统流量限制,为了提高低频出力,需要加大震动系统流量,但受到震源空间和发动机功率限制,目前流量限制在每分钟1000 L。Subsurface image resolution can be improved by extending signal frequency bandwidth toward lower frequencies.the low frequencies are very important in seismic trace inversion to improve the accuracy of the surface velocity.However,the vibrator performance at low frequencies is restrained by mechanical and hydraulic limits that exist in the vibrator system.thefirstoneis the reaction mass stroke,in order to keep the high frequency performance,the maximum mass stroke is about 20cm.the secondoneispumpflow,those significantly limit the vibrator drive level and the quality of the ground force output from the vibrator。

关 键 词：可控震源 重锤行程 低频扫描 液压系统排量 震源出力 

分 类 号：P631.4[天文地球—地质矿产勘探]