The move follows the recent approval of the contract by Kazakh State Reserves Committee.
The company is currently producing natural gas from the Kyzyloi sandstone covering around 70,918 acres of area. The extended contract will give the company more time to produce gas from the area.
According to Tethys, the Kyzyloi area, with rich oil and gas fields, is developing rapidly and still has potential for exploration and discovered deposits.
Tethys Petroleum executive chairman and president Dr. David Robson said: "I would like to take this opportunity to recognize the Tethys team for their hard work in successfully achieving this contract extension and for their ongoing contributions and dedication that make Tethys the successful Company that it is today."
In addition to Kazakhstan, Tethys has oil and gas exploration and production activities in Central Asia and the Caspian Region, including Tajikistan and Georgia.
