POWER OF ATTORNEY

    The undersigned hereby authorizes and designates John D. Montanti (the "Attorney") as
her fully authorized attorney for the purpose of signing and filing on behalf of the undersigned all
forms which are permitted or required to be filed pursuant to Section 16(a) of the Securities
Exchange Act of 1934 (the "Forms") concerning the undersigned's interest in securities of
Marathon Oil Corporation ("MOC") and/or the undersigned's status with respect to MOC.  The
Forms shall include, but are not limited to, Form IDs and any other documents necessary or
appropriate to obtain codes and passwords enabling the undersigned to make electronic filings
with the SEC, and Forms 3, 4 and 5.
       This Power of Attorney authorizes the Attorney to sign and file the Forms on behalf of the
undersigned from the date hereof until the undersigned is no longer required to file Forms 3, 4
and 5 with respect to the undersigned's holdings of and transactions in securities issued by MOC,
unless earlier revoked by the undersigned in a signed writing delivered to the foregoing Attorney.
This Power of Attorney is automatically revoked with respect to each Attorney individually upon
cessation of such Attorney's employment with MOC.

Dated:  December 8th, 2021

                        /s/ Kim O. Warnica
                        Kimberly O. Warnica