Four people were injured in the crash.
After police questioned the driver, Surachat Boonsri, he and his boss visited the injured at Phra Na Khon Sri Ayutthaya Hospital and they were told their medical bills would be covered.
The collision occurred at about 7am near Wat Phanan Choeng Pier.
The oil-transport vessel was heading towards Ayutthaya’s Tha Rua district when it hit the ferry’s tail section.
Surachet claimed he did not stop after hitting the ferry because of his vessel’s size and the oil it was carrying.
The port authority inspected the scene of the accident and said the salvage job for the ferry would commence this week.