"All sorts of things might happen in the next five to 10 years."
All well and seismic data collected by TAG must be submitted to government agency New Zealand Petroleum & Mineral, which will make it publicly available on its free database.
TAG will concentrate on proven Taranaki reserves.
The Canadian-owned and listed company operates only in New Zealand.
Notice it would drop the PEP 38349 exploration permit was announced in the company's third-quarter results.
Revenue from oil and gas sales fell by 11 per cent for the quarter ended December 31 to $5.1 million from $5.7 million for the previous quarter. The 11 per cent decrease was due to a 7 per cent decrease in oil prices and 6 per cent decrease in oil and gas volume sold.
TAG's surrendered permits, including the Waitangi Valley drill site near Gisborne, will be included in future government Block Offers.
The Waitangi well was abandoned in 2014 because of unprecedented high pressure reserves at shallow depths.
Australian and New Zealand company Mosman Oil & Gas currently holds an 883sq km exploration area that includes Dannevirke and Pahiatua.