Global Oil and Gas EPC Market Size, Share and Analysis Report By Service Type (Construction, Engineering, Procurement, Project Management, Commissioning, and Others), By Sector (Upstream, Midstream, and Downstream), By Project Type (Brownfield Projects and Greenfield Projects), By Application (Onshore and Offshore), By End-User (National Oil Companies, International Oil Companies, Independent Oil Companies, and Others), By Region and Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2026-2035