地质雷达在镇巴地区露头地质调查中的应用
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摘要
野外露头的精细地质研究对于油气勘探与开发有着重要作用,利用探地雷达可直观地对露头地质结构进行高精度成像。国外已将该技术应用到露头地质研究的众多领域中,如浅层断层识别、岩溶地质研究等。陕西镇巴地区地质条件良好,风化岩石、破碎带、岩溶地貌等地质现象丰富,使用100MHz和400 MHz探地雷达对该区露头进行了试验性研究。通过对资料的精细解释,从而确定了该区表层岩性的分布情况,总结了不同岩性层的波形特征,说明了地质雷达应用于野外露头地质调查的有效性。特别是在勘查溶洞、划分岩性分界面及断裂带方面有着很好的应用潜力,对高分辨率地震野外采集有着重要的指导意义。
The geological study of field outcrop is important for gas-oil exploration and development.Ground penetrating radar(GPR) can be used for high resolution imaging of outcrop geological structure.Foreign geologists have used GPR in many fields of outcrop geological studies such as shallow fault,paleokarst study and so on.The outcrop geological condition in the Zhenba is well developed and present abundant geological phenomena including weathered rocks,Broken Zone,karst features and so on.Ground penetrating radar experimental survey with frequency of 100MHz and 400 MHz has been conducted in this area.Meticulous interpretation is performed on the acquired data to determine the distribution of lithology and summarizes the waveform characteristics of different rock.The results show that GPR is effective method for outcrop geological imaging,especially for inspecting cavern,demarcating lithologic interface and zone of rupture.Meanwhile,the results can be used as a guide in the high resolution seismic data acquisition.
The geological study of field outcrop is important for gas-oil exploration and development.Ground penetrating radar(GPR) can be used for high resolution imaging of outcrop geological structure.Foreign geologists have used GPR in many fields of outcrop geological studies such as shallow fault,paleokarst study and so on.The outcrop geological condition in the Zhenba is well developed and present abundant geological phenomena including weathered rocks,Broken Zone,karst features and so on.Ground penetrating radar experimental survey with frequency of 100MHz and 400 MHz has been conducted in this area.Meticulous interpretation is performed on the acquired data to determine the distribution of lithology and summarizes the waveform characteristics of different rock.The results show that GPR is effective method for outcrop geological imaging,especially for inspecting cavern,demarcating lithologic interface and zone of rupture.Meanwhile,the results can be used as a guide in the high resolution seismic data acquisition.
引文
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[2]陈义群,肖柏勋.论探地雷达现状与发展[J].工程地球物理学报,2005,2(2):149~155.
[3]邓世坤.探地雷达野外工作参数选择的基本原则[J].工程地球物理学报,2005,2(5):323~329.
[4]胡朝彬,邓世坤,梅宝.探地雷达在调查地下人工构(建)筑物中的应用[J].工程地球物理学报,2007,4(1):46~51.
[5]李嘉,郭成超,王复明,等.探地雷达应用概述[J].地球物理学进展,2007,22(2):629~637.
[6]Smith D G,Jol H M.Radar structure of a Gilbert-type delta,Peyto Lake,Banff national park,Canada[J].Sedimentary Geology,1997,113:195~209.
[7]McMechan G A,Loucks R G,Zeng Xiaoxian,etal.Ground penetrating radar imaging of a collapsedpaleocave system in the Ellenburger dolomite,centralTexas[J].J.Applied Geophysics,1998,39:1~10.
[8]Meschede M,Asperion U,Reicherter K.Visual-ization of tectonic structures in shallow-depth highresolution ground penetrating radar(GPR)profiles[J].Terra Nova,1999,9(4):167~170.
[9]Asprion U,Aigner T.An initial attempt to map car-bonate buildups using ground-penetrating radar:anexample from the Upper J urrassic of SW-Germany[J].Facies,2000,42:245~252.
[10]Corbeanu R M,Soegaard K,Szerbiak R B,et al.Detailed internal architecture of a fluvial channelsandstone determined from outcrop,cores,and 3-Dground-penetrating radar:example from the middleCretaceous Ferron sandstone,east-central Utah[J].AAPG Bulletin,2001,85(9):1583~1608.
[11]Udphuay,Spencer H W.Outcrop-scale imaging oflacustrine delta sediments using ground penetratingradar and seismic methods[C].SEG Expanded Ab-stracts,2004,23:1468~1471.
[12]张兴阳,罗平,顾家裕,等.探地雷达在露头地质研究中的应用—以塔里木盆地奥陶系碳酸盐岩露头为例[J].石油实验地质,2 0 0 4,2 6(2),2 1 2~2 1 6.
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