Mr Porter said the whale's death was a significant tohu (sign) because foreign vessels had been mapping the seabed off Ninety Mile Beach and would start seismic testing in December.
"It is significant that it is here at Tauroa that this taonga from Tangaroa has come to rest and to help nurture our journey for us as kaitiaki of our moana."
The name given to the whale was Tauroa after its final resting place. Tauroa Pt was a significant place to the people of Te Rarawa and Ngati Kahu, and was well known for its bounty of kaimoana.
In a year's time the whale would have a second life as taonga binding people together as kaitiaki and hapu, Mr Porter said.
Two weeks earlier a 10m sperm whale washed up dead at Hukatere on Ninety Mile Beach.
Norwegian oil firm Statoil has started a six-year exploration programme in 10,000sq km off Northland's west coast after winning a government tender last year.