| Title | Structural Features of Geothermal Field from Magnetotelluric Survey in Northern Central Region of Vietnam |
|---|---|
| Authors | DOAN Van Tuyen, TRAN Anh Vu, PHAM Ngoc Dat, LE Van Si, DINH Van Toan, LAI Hop Phong |
| Year | 2015 |
| Conference | World Geothermal Congress |
| Keywords | Magnetotelluric, Geothermal, Reservoir, hot water, Vietnam, Northern – Central region, Quang Binh province, Quang Tri province, Bang, Da Krong |
| Abstract | The first result of Magnetotelluric survey for geothermal investigation in Vietnam is conducted in 2013 and presented. The fifteen MT data collected mainly between 0.001-5000 Hz by MTU 2000 equipment is of useful quality and provides good control on the surface layers in two high hot water 75-105◦C areas Bang (Quang Binh province) and Da Krong (Quang Tri province) belong Northern-Central region of Vietnam. It means that reliable modeling should be possible to a depth of 10,000 m depending on resistivity distribution. The data was processed and modeled using an improved modeling method by WinGlink software. The resulting 1D and 2D models show a high–very low–very high resistivity sequence with depth. The second layer is a very conductive layer distributing at a depth range from 1.2 – 3.5 km and is interpreted as the reservoir that has thermal convection and hot fluids contained in its fractures and pores. The resistive basement is a hot and solid magmatic intrusion and is interpreted as a heat source that produces a conductive heat flow towards the reservoir. As a result, the shallow resistivity model of the areas is in a good correlation with the geological features. This result allows explain the common conceptual resistivity model which has been presented for the geothermal reservoirs. |