Diamondback Energy Inc. will expand in the Permian Basin after agreeing to acquire subsidiaries of closely held Double Eagle IV Midco LLC for about $4.1 billion, a significant asset boost for the top independent oil producer in North America’s most prolific shale patch.

Diamondback Energy, a major player in the shale oil industry, has announced its acquisition of certain units of Double Eagle Energy. The deal, valued at approximately $4.08 billion, will be settled through a combination of cash and stock.

EIR analyst Andrew Dittmar called the deal a priority for Diamondback “because it represents one of the last current opportunities to get a large, high-quality asset from a