Swiss commodities giant Vitol Inc. is adding to its Lower 48 upstream portfolio with the acquisition of privately held Delaware Basin Resources LLC (DBR).

Vitol affiliate VTX Energy Partners LLC has entered a deal to acquire Midland, TX-based DBR and associated surface and water businesses for an undisclosed sum, management said Thursday.

VTX is the successor company to Austin-based ATX Energy Partners. 

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The DBR assets comprise 35,000 net leasehold acres and 46,000 surface acres across Reeves and Pecos counties, located in Texas,...