火山岩盖层下地震找矿技术试验
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摘要
火山岩的密度和地震波传播速度一般高于相同深度的沉积围岩,与围岩具有较明显的密度和速度差,由于火山岩与围岩界面形态及产状复杂,导致地震波成像困难。笔者结合澧水火山岩盆地地震勘探试验工作,讨论了适合于火山岩盖层下寻找深部金属矿的地震勘探技术。采用小道间距、长排列、高覆盖次数、火山岩顶界面(或火山岩内部)激发的采集方式,有助于获取火山岩内部及其下伏地层界面产生的反射波。
Density and seismic wave velocity of volcanic rock generally higher than the sedimentary rock at same depth,it possesses more obvious density and velocity differences with surrounding rock.Interface shape and occurrence between volcanic rocks and surrounding rock are complex,resulting in seismic wave imaging difficulties.The authors discuss the seismic technology suitable for prospecting deep metal mine under volcanic cover combing with seismic exploration in Lishui volcanic basin.It helps to obtain the reflected wave formed by volcanic rock internal and its underlying strata interface using acquisition pattern of small group interval,long spread,high fold,shooting at volcanic rock top interface or internal volcanic rocks.
Density and seismic wave velocity of volcanic rock generally higher than the sedimentary rock at same depth,it possesses more obvious density and velocity differences with surrounding rock.Interface shape and occurrence between volcanic rocks and surrounding rock are complex,resulting in seismic wave imaging difficulties.The authors discuss the seismic technology suitable for prospecting deep metal mine under volcanic cover combing with seismic exploration in Lishui volcanic basin.It helps to obtain the reflected wave formed by volcanic rock internal and its underlying strata interface using acquisition pattern of small group interval,long spread,high fold,shooting at volcanic rock top interface or internal volcanic rocks.
引文
[1]徐明才,高景华.金属矿地震勘探[M].北京:地质出版社,2009.
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[3]李勇,宋宗平,李琼,等.火山岩体地震特征识别技术与应用研究[J].矿物岩石,2008,28(3):105-110.
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[6]王志,贺振华,黄德济,等.高速屏蔽层下弱反射层地震勘探—广角反射[J].勘探地球物理进展,2002,25(5):23-27.
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[3]李勇,宋宗平,李琼,等.火山岩体地震特征识别技术与应用研究[J].矿物岩石,2008,28(3):105-110.
[4]李可恩,熊晓军,杨俊.高速屏蔽层下地震数据的采集[J].天然气地球科学,2006,17(4):527-531.
[5]王建花,李庆忠.浅层强反射界面的能量屏蔽作用[C]//CPS/SEG2004国际地球物理会议论文集,2004:59-63.
[6]王志,贺振华,黄德济,等.高速屏蔽层下弱反射层地震勘探—广角反射[J].勘探地球物理进展,2002,25(5):23-27.
[7]李智宏,胡中平,王辉明,等.含高速层地震物理模型的广角地震波场研究[J].勘探地球物理进展,2005,28(5):345-348.
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