| Title | Cold Water Downflow Identification in The Upflow Zone |
|---|---|
| Authors | Vivi NUSANTARA, Muhammad IKHWAN, Tofan SASTRANEGARA, Dhanie MARSTIGA |
| Year | 2025 |
| Conference | LATAM Geothermal Congress |
| Keywords | Cold water downflow, caprock, smectite, borehole, Lumut Balai |
| Abstract | This study presents a subsurface investigation to identify and mitigate cold water downflow within the upflow zone of a geothermal system. Despite intersecting a prominent reservoir, the risk of reduced well productivity remains due to cold water downflow below a “leaked caprock”. A thin conductive layer interpreted as caprock discontinuity may allow shallow cold water to intrude into the reservoir. Low smectite content and an extensive transitional alteration zone observed during drilling may serve as early indicators of a leaked caprock. |