Analysts from Macquarie Capital Securities Ltd. to Jefferies Group LLC are predicting impairments when the companies report 2015 earnings this week. PetroChina may take a charge of about 28 billion yuan ($4.3 billion), which may push it to its first ever quarterly loss, according to Gordon Kwan, head of Asia oil and gas research at Nomura Holdings Inc. in Hong Hong. Cnooc, which undertook some asset impairments in 2014, may write down more for 2015, according to Lu Wang, an analyst at Bloomberg Intelligence.

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