轻便可控震源与夯击震源在金属矿地震勘探中的对比试验研究
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摘要
可控震源具有分辨率高、频率范围选择自由、能量频谱有一定可控性等优点。但目前在浅层地质勘探中 ,尚缺乏可控、无损和高分辨率的震源。吉林大学国土资源部现代地球物理仪器开放研究实验室研制的轻便高频可控震源系统填补了国内这一空白。为验证其可靠性和稳定性 ,在河北省迁安大石河铁矿进行了轻便高频可控震源 (PHV )系统与夯击震源WACKERBS6 0Y系统的对比试验。试验结果表明 :高频可控震源工作稳定、效率高 ,较夯击震源有着较为明显的优点 ,且其地震反射剖面与夯击震源地震剖面具有良好的一致性。可控震源无疑将成为浅层工程、地质勘探无损探测的有力工具 ,具有广阔的应用前景。
The excellence of portable high-frequency vibroseis (PHV) mainly lies in high-resolution and free choice of sweep frequencies. In shallow engineering-geophysical applications, there is a lack of controlled, nondestructive and high-resolution mapping tool. A portable, high-frequency P-wave vibrator system developed by Jilin University is capable of bridging this gap. In order to validate its reliability and stability,a test of comparing the PHV with WACKER was carried out at Qianan mine camp, Hebei Province. The result of high-frequency seismic reflection imaging using the portable vibrator system suggests that it has advantage with high-resolution,steady operation and highly efficient work and two seismic profiles have good consistency.It is no doubt that this portable vibrator source indeed serves as a powerful, nondestructive technique for shallow engineering-geophysical prospecting, and have a wide foreground in shallow applications.
The excellence of portable high-frequency vibroseis (PHV) mainly lies in high-resolution and free choice of sweep frequencies. In shallow engineering-geophysical applications, there is a lack of controlled, nondestructive and high-resolution mapping tool. A portable, high-frequency P-wave vibrator system developed by Jilin University is capable of bridging this gap. In order to validate its reliability and stability,a test of comparing the PHV with WACKER was carried out at Qianan mine camp, Hebei Province. The result of high-frequency seismic reflection imaging using the portable vibrator system suggests that it has advantage with high-resolution,steady operation and highly efficient work and two seismic profiles have good consistency.It is no doubt that this portable vibrator source indeed serves as a powerful, nondestructive technique for shallow engineering-geophysical prospecting, and have a wide foreground in shallow applications.
引文
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[2] SteerDN ,BrownLD ,KnappJH ,etal.Comparisonofex plosiveandvibroseissourceenergypenetrationduringCOCORPdeepseismicreflection profilingintheWillistonBasin[J].Geophysics,1996,61(1):211—221.
[3] CalvertAJ ,LiYX .SeismicreflectionimagingoveramassivesulfidedepositattheMatagamiminingcamp,Quebec[J].Geophysics,1999,64(1):24—32.
[4] SpenceC ,ThurlowG ,WrightJ ,etal.AvibroseisreflectionseismicsurveyattheBuchansMineincentralNewfoundland[J].Geophysics,1993,58(1):156—166.
[5] 张子三,林君,陈祖斌,等.轻便高频可控震源系统的研制[J].测控技术,2000,10:50—53.
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