TN968 : Using Occam method for 3D inversion of Magnetotelluric data in order to explore geothermal structure location of Northwest of Iran
Thesis > Central Library of Shahrood University > Mining, Petroleum & Geophysics Engineering > MSc > 2020
Authors:
Fatemeh Firoozi [Author], Abolghasem Kamkar Rouhani[Supervisor], Mohammad Filbandi Kashkouli [Advisor]
Abstarct: Magneto telluric method is one of the electromagnetic methods in frequency domain . it uses natural electromagnetic fields to study the structure of subsurface resistivity structures . due to the fact that geothermal resources produce large changes in the subsurface resistivity , the objectives of organic ideas are for the non - surface resistivity method . due to numerous hot water sources , the sabalan area has been extensively studied by various physical geo - sources for the discovery and modeling of geothermal resources . hydrostatic alteration leads to changes in the physical properties ( electrical resistivity . gravity, wave velocity of the medium can be observed that these abnormal or non - normative changes can be detected by different geophysical methods including both magnetic and electromagnetic methods such as magnetic and electromagnetic methods , gravity , magnetic and tomography methods . in particular , Magneto telluric (MT) methods play an important role in the imaging of geo - thermal resources . in this study, the response of the 24 magneto telluric station process was carried out by Philippines company experts Energy Development Corporation in 2007 using the Phoenix MTU-5 A device of 0.0005 to 380 A from the Moeil valley located in the west and southwest of the removal mountain range. also in this study, how to change the special resistivity of the different laxyers of the earth under ground surface to the depth of a few kilometers and the arrival of geothermal sources and the state of the geology of these areas. one dimensional modeling using Occam and Bostick method and 2 D modeling has been done using the non - linear gradient method. inverse 3D modeling is done using modeling WSINV3DMT algorithm. the results obtained from 3D inversion indicate that the conductor continue to be from a depth of 800-1200 m to 2500 meters, which is actually the thermal storage reservoir. the region has fractures and faults in accordance with the geological map that the fluid has continued on the fracture boundary.
Keywords:
#Magnetotelluric #3D inversion modelling #WSINV3DMT #Occam method #nonlinear conjugate gradient method Keeping place: Central Library of Shahrood University
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