PROSPECT AREA DELINEATION AND CHARACTERIZATION OF NON-VOLCANIC GEOTHERMAL RESERVOIRS FOR DIRECT USE IN BANDA BARU, CENTRAL MALUKU

DELINEASI AREA PROSPEK DAN KARAKTERISASI RESERVOIR PANAS BUMI NON-VULKANIK UNTUK PEMANFAATAN LANGSUNG DI BANDA BARU, MALUKU TENGAH

Authors

  • Erawan Melisano PSDMBP Author
  • Husin Setia Nugraha Author
  • Tonny Rahadinata Author
  • Prihadi Sumintadireja Author

DOI:

https://doi.org/10.47599/bsdg.v20i3.548

Keywords:

direct use, Geothermal, Banda Baru, geoscience data integration, groundwater potential zoning

Abstract

The significant disparity between Indonesia's geothermal direct-use potential (230 MWt) and its current utilization (8 MWt) necessitates precise delineation methods for non-volcanic systems. This study aims to characterize the shallow reservoir and delineate the prospect area in Banda Baru, Central Maluku, using integrated geoscience data. A GIS-based Multi-Influencing Factor (MIF) method was applied to map groundwater potential, which was then synthesized with surface CO2 gas anomalies and Magnetotelluric (MT) resistivity gradient modeling. The results identified a 6.49 km2 prospect area controlled by fracture structures within metamorphic rocks. Validation through the BBR-1 temperature gradient well drilling showed significant success, encountering 95°C fluid at a depth of 164 meters. This finding prompted a re-evaluation of geophysical interpretations, proving that low resistivity values (<50 ohm-m) represent active thermal aquifers rather than conventional clay caps. Based on production tests, the total measured resource potential in this region is estimated at 6.3 MWt. This integrated modeling provides a strategic instrument for efficient non-volcanic geothermal development to support the local economy through sustainable direct-use schemes.

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Published

2025-11-30

Issue

Vol. 20 No. 3 (2025): Buletin Sumber Daya Geologi

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