EXHIBIT 99.1 07.10.13

today that it has engaged an advisor to market all of its properties in the Anadarko Basin, which includes the Company's Granite Wash interests. The marketing process is anticipated to take approximately six months. Production from the assets represents slightly over 9,000 BOE per day (75% natural gas), which is approximately 8% of the Company's total production in the first quarter of 2013. The Company's Anadarko Basin assets include approximately 56,000 net mineral acres. SM Energy regularly reviews its asset portfolio to identify opportunities to high grade and concentrate its inventory through divestitures such as this planned sale, the proceeds of which the Company expects to fund strategic projects in its portfolio.

This press release contains forward-looking statements within the meaning of securities laws, including forecasts and projections. The words “anticipate,” “assume,” “believe,” “budget,” “estimate,” “expect,” “forecast,” “intend,” “market,” “plan,” “project,” “will” and similar expressions are intended to identify forward-looking statements. These statements involve known and unknown risks, which may cause SM Energy's actual results to differ materially from results expressed or implied by the forward-looking statements. These risks include factors such as the availability, proximity and capacity of gathering, processing and transportation facilities; the uncertainty of marketing efforts and negotiations to result in an agreement or a completed transaction; the uncertain nature of announced acquisition, divestiture, joint venture, farm down or similar efforts and the ability to complete any such transactions; the uncertain nature of expected benefits from the actual or expected acquisition, divestiture, joint venture, farm down or similar efforts; the volatility and level of oil, natural gas, and natural gas liquids prices; uncertainties inherent in projecting future rates of production from drilling activities and acquisitions; the imprecise nature of estimating oil and gas reserves; the availability of additional economically attractive exploration, development, and acquisition opportunities for future growth and any necessary financings; unexpected drilling conditions and results; unsuccessful exploration and development drilling results; the availability of drilling, completion, and operating equipment and services; and other such matters discussed in the “Risk Factors” section of SM Energy's 2012 Annual Report on Form 10-K. The forward-looking statements contained herein speak as of the date of this announcement. Although SM Energy may from time to time voluntarily update its prior forward-looking statements, it disclaims any commitment to do so except as required by securities laws.