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A second gas well is leaking in the Timor Sea, just 50km north-west of the PTTEP rig that has been spewing oil and gas into the marine ecosystem for nearly ten weeks.

The well, part of the Puffin oilfield 440km north-west of Wyndham, is owned by Chinese-owned oil and gas giant Sinopec, that country's largest producer and supplier of oil products.

Sinopec Australia general manager projects and operations Steve Kanthan has told WA Business News the leak was "minor in nature".

He said the leak had been reported to the National Offshore Petroleum and Safety Authority and the Northern Terrority Department of Mines.

"During routine ... inspection, the Joint Venture became aware of an anomaly in one of the subsea production trees," Kanthan told WA Business News.

"A minor gas leak from the subsea tree was noted. While this was minor in nature, the occurrence was reported to the relevant authorities ... as per the statutory reporting requirements.

"Remedial action may be required but is not considered to be of an urgent nature."

Sinopec did not reveal details of the extent of the leak.

While Sinopec has moved to play down the seriousness of the leak, its revelation will focus further scrutiny on oil and gas producers off the north-west WA coast coming so soon after the PTTEP leak.