Two-dimensional magnetotelluric characterization of the El Hito Anticline (Loranca Basin,Spain) |
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| Institution: | 1. Institut de Recerca, Centre Mixt d''Investigació GEOMODELS, Group of Geodynamics and Basin Analysis, Dept. Geodinàmica i Geofísica, Universitat de Barcelona (UB), Spain;2. Spanish Geological Survey (IGME), Rios Rosas 23, 28003 Madrid, Spain;1. School of Energy Resources, China University of Geosciences, Beijing 100083, China;2. Key Laboratory for Marine Reservoir Evolution and Hydrocarbon Abundance Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China;3. Beijing Key Laboratory of Unconventional Natural Gas Geology Evaluation and Development Engineering, China University of Geosciences, Beijing 100083, China;4. Key Laboratory for Shale Gas Exploitation and Assessment, Ministry of Land and Resources, China University of Geosciences, Beijing 100083, China;5. School of Geosciences, China University of Petroleum, Qingdao 266580, China;6. Zhongyuan Oilfield Co. Ltd., SINOPEC, Oil Recovery Plant No.3, Puyang 066004, China;1. SEDISOR, IUEM, Place Nicolas Copernic, 29280 Plouzané, France;2. UMR 8212 LSCE/CEA-CNRS-UVSQ, 91118 Gif sur Yvette, France;3. UMR 6538 Laboratoire Géosciences Océan, IUEM, Université de Bretagne Occidentale, 29280 Plouzané, France;4. Université Grenoble Alpes, CNRS, ISTerre, 38000 Grenoble, France;5. Unité de Recherche Géosciences marines, Ifremer-CB, 29280 Plouzané, France;1. Department of Mining Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;2. Mineral Bioprocessing Research Group (MBRG), Biotechnology and Bioengineering Research Institute, Isfahan University of Technology, Isfahan 84156-83111, Iran;1. A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Koptyuga 3, 630090, Novosibirsk, Russia;2. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia |
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| Abstract: | Magnetotelluric surveys were conducted to investigate the structure in the El Hito Anticline in the southern Loranca Basin, Spain. The structure of this anticline is partly known from nearby data (geological cross sections, geological maps, well-logs) from vintage geophysical and geological basin-scale surveys. Unfortunately, these surveys do not have the appropriate resolution to determine certain characteristics of the anticline accurately, such as the thickness or geometry of geological units. To address this deficiency, magnetotelluric data were acquired at 51 sites along three profiles to image the electrical resistivity of the anticline. To identify a geologically reasonable resistivity model, a conceptual model based on previous geological and geophysical information (cross sections and well-log data) was generated. Several inversions were performed using the conceptual model, which played a key role in the interpretation of the magnetotelluric data, and the construction of a suitable initial model was essential in producing geologically meaningful models. Using these results, we obtained 2-D resistivity models that provide information on the main geological units and structures. We also performed sensitivity tests to understand the morphology and structure of the resistive basement better. The results indicate the presence of basement highs that show different structural styles for the basement and its cover, and an increase in the basement depth towards the south. The final 2-D resistivity models provide new information regarding the structure of the anticline and demonstrate a clear correlation between the main geological units and resistivity, as well as correlations with mapped surface faults. |
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