Offshore production facility for producing, treating and refining raw gas

An offshore production complex for raw gas extraction, treatment and processing comprising a substructure with a topside located on the substructure, the topside including a drilling facility, a flare unit, process equipment for raw gas treatment and processing, and living quarters, with the substructure accommodating storage tanks for respective processed products, wherein the substructure is a one-piece concrete gravity-based structure (GBS) that has a central part and a protruding part, with the central part being a rectangular prism with a top slab with the process equipment located on the top slab, and the GBS protruding part stretching along the central part sides all along a perimeter of the central part and having vertical external walls, the central part and the protruding part sharing a base slab, the protruding part being lower in height than the central part, the GBS central part having longitudinal and transverse walls that form compartments, including ballast compartments and compartments accommodating storage tanks for respective processed products, and the GBS protruding part having internal walls that are perpendicular to the external walls and form ballast compartments.