The cash injection into the Dubai Mercantile Exchange (DME) has diluted the stake of Dubai Holding.
The agreements were signed between Oman’s health ministry and Oman LNG.
The pipeline will supply gas to the town of Duqm and is estimated to cost around $200- 220 million to build.
The country is scrambling to find an alternative to its threatened primary supply from Iran, Oman’s oil minister has said.
Swiss and German investment funds are undertaking the project.