Use new evidence of regional geological structures in Ilan inferred from resistivity MT data to evaluating the geothermal reservoir
Speaker: Chia-Chi Huang Adviser: Chien-Ying Wang
Abstract
The Ilan Plain is located at the southwestern tip of the back arc basin of the Okinawa Trough, which propagates westward into the Taiwan orogen. A long discussed issue concerns whether the opening normal-fault system of the Okinawa Trough propagates and transforms into the thrust-fault system of the Taiwan orogen. The 2D and 3D inverted resistivity images reveal the regional structures. A major conductive structure dipping toward the northwest at an angle of 30° - 40° is located at the expected site of the Niudou Fault separating the Early Miocene Szeleng and Kangkou Formations from the Lushan Formation in the Sanshing area, which dip direction of two conductive structures with a dipping angle of 50° - 70° were coinciding with the dip direction of normal faults identified from the field surveys. Resistivity profiles from the Chingshuichi area reveal the existence of the vertical Chingshuichi, the Dachi, and the Xiaonanauo Fault. Hot springs were found in the junction area of the Chingshuichi and the Xiaonanauo Fault. The junction region of these two fault systems is the potential Chingshui geothermal field that provides fluid geothermals from the deep.
Reference
Ho, G. R., Chang, P. Y., Lo, W., Liu, C. M., & Song, S. R. (2014). New Evidence of Regional Geological Structures Inferred from Reprocessing and Resistivity Data Interpretation in the Chingshui-Sanshing-Hanchi Area of Southwestern Ilan County, NE Taiwan. Terrestrial, Atmospheric and Oceanic Sciences, 25(4), 491-504
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Chang, P. Y., Lo, W., Song, S. R., Ho, K. R., Wu, C. S., Chen, C. S., Lai, C. Y., Chen, H. F. & Lu, H. Y. (2014). Evaluating the Chingshui geothermal reservoir in northeast Taiwan with a 3D integrated geophysical visualization model. Geothermics, 50, 91-100.