By OGJ editors
HOUSTON, Nov. 29 -- Salamander Energy PLC said its Angklung-1 exploratory well off East Kalimantan, Indonesia, is a commercial gas discovery in Lower Pliocene sandstone and also discovered an Upper Miocene oil play.
The Hakuryu-5 semisubmersible drilled Angklung-1 to 2,850 m true vertical depth subsea in 290 m of water in the North Kutei basin on the 2,185 sq km Bontang PSC, which Salamander operates with 100% interest. The wellsite is 60 km north of giant Attaka oil and gas field.
The well logged 23-27 m of net gas pay in a high-quality Lower Pliocene sandstone unit at 1,850 m TVD subsea. Logs indicate porosity up to 30% and permeability of 50 md. A 10-m interval flowed at a surface equipment constrained rate of 24 MMscfd of dry gas with no carbon dioxide or hydrogen sulfide.
The well also encountered a gross 256-m section of interbedded sandstones and shales of Upper Miocene age. Following petrophysical evaluation of a full suite of wireline logs, this interval is interpreted to contain a net 120 m of oil-bearing sandstones.
A comprehensive sampling and pressure testing program recovered samples of light oil and gas, though the sandstones were proved to be of low permeability and are not considered net pay at this location. The well reached TD in a sequence of Upper Miocene carbonates with strong gas shows.
Salamander has shot more than 650 sq km of 3D seismic in the Bontang PSC over the Angklung structure and surrounding prospects. The Angklung trend extends into the neighboring SE Sangatta block, which Salamander operates with 75% interest, where a 475 sq km 3D seismic survey is being run.
The well has been plugged and abandoned as a discovery. Salamander will conduct further technical work to evaluate both the discovery’s resource potentialand the large inventory of prospects on its acreage that exhibit similar seismic attributes to the pay section seen in Angklung-1 well. Work will also be undertaken to further understand the Upper Miocene oil play fairway.