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Oklahoma-based Chesapeake Energy Corp. is exploring”alternatives to enhance shareholder value, including a possiblesale or merger of the company.” The word comes on the heels of anexpected $250 million second quarter loss stemming from awrite-down due to lower gas and oil prices. The company’s boardalso adopted a shareholder rights plan, or poison pill.

Marathon Oil plans to return to Canada with its agreement toacquire Tarragon Oil and Gas Ltd. of Calgary for $1.1 billion,including $340 million of assumed debt. Marathon has not held oilor gas properties in Canada since divesting its Canadian holdingsin 1982.

ONEOK Resources has signed a definitive agreement with OXY USAto purchase some of its natural gas and oil reserves including morethan 400 wells in Oklahoma and Kansas outside the Hugoton field forapproximately $135 million before adjustments. Net production isapproximately 30 MMcf/d and 400 b/d. The properties havelower-risk development potential for increased reserves. WhileONEOK’s previous reserve acquisitions have been concentrated inOklahoma, this purchase includes significant reserves in Kansaswhere ONEOK recently acquired Kansas Gas Service, an LDC servingtwo-thirds of the state. David Kyle, president and chief operatingofficer of ONEOK, Inc., said the acquisition will almost doubleONEOK’s oil and gas reserve base. The acquisition includes a gassweetening plant located in the Aledo Field in Oklahoma.