sentences:  The acquisition added about 317,000 acres in Marcellus Shale to ExxonMobil's portfolio.In August of the same year, ExxonMobil leveraged XTO Energy's expertise in a trade with Russian oil company Rosneft in a deal worth $3.2 billion, giving ExxonMobil access to oil and gas opportunities in the Russian Arctic.In September 2012, ExxonMobil and XTO Energy signed a land exchange agreement with Denbury Onshore LLC, acquiring 196,000 acres in the Bakken Shale in North Dakota and Montana.