UK explorer Premier Oil has boosted resource potential for a possible field development off Indonesia after hitting wet gas with a probe at the Singa Laut (Sea Lion) prospect.
The Singa Laut-1 well, drilled as a sidetrack to the earlier Kudu Laut (Sea Horse) oil and gas find in the Premier-operated Tuna production sharing contract, struck 177 feet of net gas-bearing reservoir sands in the targeted Oligocene sequence.
The explorer said in a statement the discovered gas “appears to be of similar quality to the liquids-rich gas” found with the adjacent Kudu Laut well.
Premier’s exploration director said the latest discovery, drilled by semi-submersible Ocean General, had boosted its gross resource estimate for the Tuna block to 100 million barrels of oil equivalent.
The operator is understood to be looking at a possible commercial development using a floating production, storage and offloading vessel that could be brought on stream fairly quickly.
Singa Laut-1 will now be plugged and abandoned as a successful exploration well, with further appraisal drilling planned at both discoveries next year for further determine their combined oil and gas resource potential, Premier stated.
Meanwhile, Premier revealed it has hit gas shows with the Ratu Gajah-1 exploration well drilled into the deep Lama formation at its Natuna Sea Block A PSC off Indonesia, although “sandstone quality is low”.
The London-listed explorer now intends to carry out a drill stem test to determine whether there are moveable hydrocarbons at the well.
Ratu Gajah has probable gross unrisked resources of 37 million barrels of oil equivalent, with a mid-point gross prospective resource of 225 billion cubic feet of gas, and there is follow-up potential at Ratu Gajah East, according to Premier.
The company aims to carry out more drilling at the Lama play early next year with an appraisal of the Anoa Deep discovery and is also looking to high-grade other prospects, targeting gross prospective gas resources of more than 1.5 trillion cubic feet.
Gross prospective resources at the Natuna Sea Block A PSC are put at about 2 Tcf.