World Geothermal Congress 2020+1
March - October, 2021

Magnetotelluric and Gravity Surveys in Sg. Segaria–Sg. Jipun, G. Pock Area, Kunak, Sabah, Malaysia

Fredolin JAVINO

[MALAYSIAN METEOROLOGICAL DEPARTMENT, Malaysia]

Gravity and MT/TDEM surveys were conducted, in the Sg Segaria – Sg Jipun, Gunung Pock area, Ulu Kalumpang, Sabah, to obtain the geothermal reservoir geometry and its potential. A total of 110 stations are measured for gravity, with stations spacing of 500 meter whereas the MT/TDEM survey consists of 31 stations, done with intervals of 1,000 meter. The stations are distributed regularly as permitted by the rugged terrain. The hot springs occurred within a Miocene age volcanics which later intruded by microgranite during the Pliocene. A geothermal reservoir which consists two linked chambers, named Body A and Body B, occupying an areal spread of some 14.60 sq km, and occurring between depths of 800-4000 meter is identified. The reservoirs occur mainly along fault zones, is capped by the unbreached layer of the volcanics. The recharge mechanism is thought to be direct feed from the northern flank of the G. Pock Range. Pressure and temperature of reservoir is expected to be hydrostatic and in the range of 180ºC ±20 ºC based on chemical geothermometers, respectively. The potential geothermal energy capacity is yet to be confirmed through drilling, but the initial measured theoretical potential is 40.25-119.61 MWe (range min-max). An infill survey is therefore suggested around the link area and preferred drilling location is at Body A which is verified by the presence of low gravity anomaly and low resistivity value zone.

        Topic: Geophysics Paper Number: 13000

         Session 8P: Poster 2 [Tuesday 11th May 2021, 11:00 pm] (UTC-8)
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