“After crude products (oil, natural gas, water, sand, etc.) are processed by the GOSPs (Gas Oil Separation Plants), the sour oil (containing H2S, hydrogen sulphide) is sent by pipeline to Abqaiq. The Abqaiq site stabilizes the oil, then pumps it to Ras Tanura (where it is exported), or further refined at a domestic refinery. Abqaiq also has NGL (Natural Gas Liquids) plants that extract natural gas liquids (butane, propane, hexane, etc.) from the oil. These NGL’s are stabilized by Abqaiq, then sent to other sites for further separation and purification.”
http://www.oilfieldwiki.com/wiki/Abqaiq
right..... Abquiq is the oil gas separation facility. The actual refinery is north of Dhahran at Ras Tanura