Salamander Energy provided Monday an update on drilling at the West Kerendan and Sungai Lahei prospects on its Bangkanai Production Sharing Contract (PSC), onshore Kalimantan, Indonesia. Salamander holds a 70 percent operated interest in the Bangkanai PSC.
To date, the well has penetrated the primary target Upper Berai formation carbonates and it is planned to drill ahead to the deeper secondary targets. All drilling, logging and other geological data collected to date points to the primary target being gas-bearing, with potential for a significant column of mobile gas at the WK-1 location.
Key points in this update:
Primary Target: Upper Berai Carbonates
The well encountered the top of the Upper Berai carbonate formation at 248 feet (2,514 meters) true vertical depth sub-sea (TVDSS), some 360 feet (110 meters) high to prognosis. These carbonates at the WK-1 location are well developed with little mud content. Elevated background gas readings and gas peaks associated with high resistivity readings have been seen across the section, a signature that is consistent with the producing wells in the Kerendan gas field.
A 121 foot (37 meter) core was cut and fully recovered from the primary reservoir at a depth of 8,694 feet (2,650 meters). The core exhibits intra-particle porosity in its basal section which is associated with gas influx to the drilling mud. Drilling gas levels have markedly reduced below 9,481 feet (2,890 meters) TVDSS, implying a base to the gas zone at a depth which is consistent with the gas-water contact in the producer wells in the Kerendan field, located some 6.21 miles (10 kilometers) to the east. This would imply a potential 1,115 feet (340 meters) mobile gas column at the WK-1 location.
The well encountered gas in the overlying secondary target Miocene sandstones. Wire-line logs, pressure and gas sampling was carried out across two gas-bearing sandstones between 4,593 and 4,888 feet (1,400 and 1,490 meters) TVDSS. The top of the Lower Berai carbonates, which form an additional secondary target, was encountered at 9,563 feet (2,915 meters) TVDSS, some 173 feet (53 meters) high to prognosis. This formation exhibits signs of permeability, with mud losses experienced at current total depth (TD), corresponding with gas ingress into the wellbore from the Upper Berai formation.
The well is currently at 10, 036 feet (3,059 meters) TVDSS within the Lower Berai carbonate formation. Preparations are underway for an intermediate wire-line logging run ahead of casing this section of the hole. The plan would then be to drill ahead through the remainder of the Berai carbonates and into the deeper Eocene target.
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