MEXICO CITY, Nov 28 (Reuters) - Mexican President

Claudia Sheinbaum said on Thursday that the debt burden

accumulated by state energy company Pemex with suppliers would

be reviewed and various payment mechanisms are being studied and

refined.

Despite efforts to reduce debt under Sheinbaum's predecessor

Andres Manuel Lopez Obrador, the company remains one of the

world's most indebted energy companies.

Under the six-year administration of Sheinbaum, who took

office on Oct. 1, Pemex will seek to maintain average crude oil

production of 1.8 million barrels per day but its debt burden

has made that challenging.