FourGEOTHERMAL PROVINCES OF JORDAN

Jordan imports most of its primary energy, yet it hosts thermal springs along the Dead Sea Transform and warm formation waters in the deep aquifers of the Arabian Platform. Screening those resources depends on reading a reservoir temperature from water chemistry, and the standard calibrations were built largely for hot, equilibrated systems rather than for cooler carbonate-buffered waters. This Geologic® study compiles 118 published and field-record analyses, verifies every published value against its printed source cell by cell, and retains the 61 that pass four screening rules across four provinces: Jordan Valley, Dead Sea and South Dead Sea on the transform, and Risha on the platform.

Cation geothermometers fail for these waters, since 58 of the 61 are immature, so silica anchors the estimate. Per-sample selection among ten calibrations and a neural-network method gives rift reservoir medians of 63, 73 and 60 °C, at the lower end of previously published silica estimates, and a Risha median of 117 °C that is not constrained, since its three field wells give values 78 °C apart. Weighted positive matrix factorization apportions the waters among a Na-Cl brine, a bicarbonate and a sulfate-bicarbonate end-member, and gives Risha the highest brine share at 61 per cent against 47 per cent for the Dead Sea, though a separation of platform from rift waters is not established. Stored heat is 0.231 GJ per cubic metre at Risha against 0.088 to 0.123 across the rift, but Risha leads only if the temperatures of two field wells are reservoir values. The platform province remains undersampled, and a dedicated sampling campaign is the stated priority.