Article : Determination of aquifer geometry through geophysical methods: A case study From Quetta Valley, Pakistan
Authors : Saenger, E.ETH Zurich Geological Institute, Zurich, Switzerland, email@example.com, Madonna, C.ETH Zurich Geological Institute, Zurich, Switzerland, Almqvist, B.ETH Zurich Geological Institute, Zurich, Switzerland, Montahaei, M.Institute of Geophysics, University of Tehran, Tehran, Iran, firstname.lastname@example.org, Oskooi, B.Institute of Geophysics, University of Tehran, Tehran, Iran, email@example.com, Pal, P.Department of Applied Mathematics, Indian School of Mines, Dhanbad, India, firstname.lastname@example.org, Mandal, D.Department of Applied Mathematics, Indian School of Mines, Dhanbad, India, email@example.com, Tsapanos, T.Aristotle University of Thessaloniki, School of Geology, Geophysical Laboratory, Thessaloniki, Greece, firstname.lastname@example.org, Bayrak, Y.Karadeniz Technical University, Department of Geophysics, Trabzon, Turkey, email@example.com, Cinar, H.Karadeniz Technical University, Department of Geophysics, Trabzon, Turkey, firstname.lastname@example.org, Koravos, G.Aristotle University of Thessaloniki, School of Geology, Geophysical Laboratory, Thessaloniki, Greece, email@example.com, Bayrak, E.Karadeniz Technical University, Department of Geophysics, Trabzon, Turkey, firstname.lastname@example.org, Marzec, P.AGH University of Science and Technology, Faculty of Geology, Geophysics, and Environment Protection, Kraków, Poland, email@example.com, Niepsuj, M.AGH University of Science and Technology, Faculty of Geology, Geophysics, and Environment Protection, Kraków, Poland, firstname.lastname@example.org, Bała, M.AGH University of Science and Technology, Faculty of Geology, Geophysics, and Environment Protection, Kraków, Poland, email@example.com, Pietsch, K.AGH University of Science and Technology, Faculty of Geology, Geophysics, and Environment Protection, Kraków, Poland, firstname.lastname@example.org, Xiao, L.Key Laboratory of Geo-detection (China University of Geosciences), Ministry of Education, Beijing, China, email@example.com, Liu, X.-P.Geological Exploration and Development Research Institute Sichuan-Changqing Drilling and Exploration Engineering Co., Chengdu, China, Zou, C.-C.Key Laboratory of Geo-detection (China University of Geosciences), Ministry of Education, Beijing, China, Hu, X.-X.Geological Exploration and Development Research Institute Sichuan-Changqing Drilling and Exploration Engineering Co., Chengdu, China, Mao, Z. Q.State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China, Shi, Y.-J.Research Institute of Exploration and Development, Changqing Oilfield, PetroChina, Xi’an, China, Guo, H.-P.Research Institute of Exploration and Development, Changqing Oilfield, PetroChina, Xi’an, China, Li, G.-R.Research Institute of Exploration and Development, Changqing Oilfield, PetroChina, Xi’an, China, Alam, K.Geophysics Division, Geological Survey of Pakistan, Lahore, Pakistan, firstname.lastname@example.org, Ahmad, N.Institute of Geology, University of the Punjab, Lahore, Pakistan, email@example.com,
Abstract : Due to increase in population and agricultural activities, the aquifer of Quetta Valley is under tremendous stress and the water table is declining at an increasing rate. This situation necessitates evaluation of the aquifer system, for which information about geometry of the aquifer is a prerequisite. However, there are no drilling-to-bedrock data available; therefore, electrical resistivity, seismic reflection and gravity methods were employed to determine geometry of the aquifer. Interpretation of vertical electrical soundings provided information about the depth-tobedrock at some specific points, whereas seismic reflection delineated bedrock topography along two lines. The depths to bedrock inferred from electrical resistivity and seismic reflection data were used as constraints in the modeling of gravity data. 2.75D gravity models were constructed along lines with a regular spacing. Map of depth-to-bedrock was prepared by contouring the depth given by the gravity models. Combination of these geophysical methods depicted the geometry of the aquifer. This example shows that in a similar geological setting proper integration of geophysical exploration methods can determine the aquifer geometry with an acceptable reliability and at an appropriate cost.
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Qute : Saenger, E. ,Madonna, C. ,Almqvist, B. ,Montahaei, M. ,Oskooi, B. ,Pal, P. ,Mandal, D. ,Tsapanos, T. ,Bayrak, Y. ,Cinar, H. ,Koravos, G. ,Bayrak, E. ,Marzec, P. ,Niepsuj, M. ,Bała, M. ,Pietsch, K. ,Xiao, L. ,Liu, X.-P. ,Zou, C.-C. ,Hu, X.-X. ,Mao, Z. Q. ,Shi, Y.-J. ,Guo, H.-P. ,Li, G.-R. ,Alam, K. ,Ahmad, N. ,Ahmad, N. , Determination of aquifer geometry through geophysical methods: A case study From Quetta Valley, Pakistan. Acta Geophysica Vol. 62, no. 1/2014