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Magnetotelluric Phase Tensor Application to Geothermal ModellingNormal access

Authors: A.B. Laksono, W.P. Anggraini, B.S. Mulyatno and C. Iskandar
Event name: EAGE-HAGI 1st Asia Pacific Meeting on Near Surface Geoscience and Engineering
Session: Session 7 : Geothermal
Publication date: 09 April 2018
DOI: 10.3997/2214-4609.201800402
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 610.06Kb )
Price: € 20

Phase tensor analysis generate invariant parameters such as the ellipticity (Φmax and Φmin) and slope angle of phase tensor (β) determine the dimensionality of the impedance tensor. If the structure of 1-D, then Φmax and Φmin will be equal, so the phase tensor form will be a circle with β is zero or near zero, for structur of 2-D the value Φmax ≠ Φmin while β is still zero or near zero and for 3D structure all components in tensor each impedance has a value and β ≠ 0 with a value of β> 3 °. The results of the above phase tensor analysis show that the 1-D and 2-D structures are shown at frequencies of 320 Hz to 0.2 Hz (the period of 0.0031s to 5.4s) and 3-D structures are shown at less from frequencies 0.11 Hz (period 9.588s). If the graphical representation non-symmetrical ellipse 2-D to the ellipse axis this because β ≠ 0, so it needs to be rotated to the ellipse axis with the angular value generated by calculation of α-β is -10o.

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