The official could not confirm whether the government had accepted the resignation.
If Martinez resigns, the government likely will appoint an interim regulator, the official said. Congress later will have to approve the full-time replacement.
The resignation was unexpected, newspaper Opinion reported.
"These past weeks there have not been any problems whatsoever, so the resignation is due to the aforementioned reasons," the paper quoted hydrocarbons minister Carlos Villegas as saying.
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