| 利用大地电磁资料对玄武岩成像的可行性 |
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| 引用本文： | Dhananjai Pandey,Lucy MacGregor,Martin Sinha,Satish Singh.利用大地电磁资料对玄武岩成像的可行性[J].应用地球物理,2008,5(1):74-82. |
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| 作者姓名： | Dhananjai Pandey Lucy MacGregor Martin Sinha Satish Singh |
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| 作者单位： | Bullard Laboratories Madingley Road，University of Cambridge，Cambridge，UK，CB3 0EZ，Presently at National Centre for Antarctic and Ocean Research，Goa.SOES，National Oceanography Centre，Southampton，UK，SO14 3ZH，Offshore Hydrocarbon Mapping Plc.，Aberdeen，UK，AB23 8GD，SOES，National Oceanography Centre，Southampton，UK，SO14 3ZH，Labomtoire de G’eosciences Marines，IPG Paris 4 Place Jussieu，75252 Paris Cedex 05，France |
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| 摘 要： | The magnetotelluric （MT） method has been among the favorite supporting tools for seismic imaging of sub-salt and sub-basalt targets. In this paper we present an example from Kachchh, India （where basaltic rocks overlie Mesozoic sedimentary rocks）, and discuss the feasibility of using MT method as an exploration tool in this geological setting. Our results highlight the difference in magnetotelluric response caused by the thin intrabasalt layering. The key issue addressed in this paper is what MT can and cannot provide in such geological settings. First, we compute apparent resistivity and phase response curves using representative resistivity-depth models and borehole data from the study area. Later, we compare these results to assess the plausibility of using MT to image the sub-volcanic sediments at Kachchh. Finally, we substantiate our discussion through one-dimensional inversion of the field observed MT data from this region that exhibits poor sensitivity of MT for thin basalt layers.
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| 关 键 词： | 玄武岩 成像技术 地球磁场 地球物理学 |
| 收稿时间： | 7 May 2008 |
| 修稿时间： | 2007年9月14日 |
Feasibility of using the magnetotelluric method for sub-basalt imaging at Kachchh,India |
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| Pandey Dhananjai,MacGregor Lucy,Sinha Martin,Singh Satish.Feasibility of using the magnetotelluric method for sub-basalt imaging at Kachchh,India[J].Applied Geophysics,2008,5(1):74-82. |
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| Authors: | Pandey Dhananjai MacGregor Lucy Sinha Martin Singh Satish |
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| Institution: | (1) Bullard Laboratories, University of Cambridge, Madingley Road, Cambridge, UK, CB3 0EZ;(2) Present address: National Centre for Antarctic and Ocean Research, Goa, India;(3) Offshore Hydrocarbon Mapping Plc., Aberdeen, UK, AB23 8GD;(4) SOES, National Oceanography Centre, Southampton, UK, SO14 3ZH;(5) Laboratoire de G’eosciences Marines, IPG Paris 4 Place Jussieu, 75252 Paris Cedex 05, France |
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| Abstract: | The magnetotelluric (MT) method has been among the favorite supporting tools for seismic imaging of sub-salt and sub-basalt targets. In this paper we present an example from Kachchh, India (where basaltic rocks overlie Mesozoic sedimentary rocks), and discuss the feasibility of using MT method as an exploration tool in this geological setting. Our results highlight the difference in magnetotelluric response caused by the thin intra-basalt layering. The key issue addressed in this paper is what MT can and cannot provide in such geological settings. First, we compute apparent resistivity and phase response curves using representative resistivity-depth models and borehole data from the study area. Later, we compare these results to assess the plausibility of using MT to image the sub-volcanic sediments at Kachchh. Finally, we substantiate our discussion through one-dimensional inversion of the field observed MT data from this region that exhibits poor sensitivity of MT for thin basalt layers. |
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| Keywords: | Sub-basalt imaging Deccan Traps Kachchh magnetotelluric |
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