Questar Market Resources Provides exploration and production, midstream and marketing services Gas and Oil Exploration & Production Questar Exploration & Production acquires, explores for, develops and produces natural gas, oil and natural gas liquids in the Rocky Mountains and Midcontinent. Wexpro manages, develops and produces cost-of-service reserves for gas-utility affiliate Questar Gas. Midstream Field Services Questar Gas Management provides midstream field services including natural gas-gathering and processing services for affiliates and third parties. Gas & Oil Marketing and Trading Questar Energy Trading markets equity and third-party natural gas and oil, provides risk-management services, and owns and operates an underground gas-storage reservoir.