Gas turbine power generating plant

A gas turbine power generating machine which can effectively utilize natural gas extracted from medium- or small-scaled gas fields and overage gas fields, liquid fuel produced during the extraction and refining process of the natural gas, as well as liquid fuel and gaseous fuel, such as associated gas, produced in medium- or small-scaled oil fields and overage oil fields. In a gas turbine power generating machine installed near, e.g., a gas field (1) and transmitting generated electricity to a consuming area through a power transmission system (12), the plant comprises a gaseous fuel processing apparatus for pre-processing natural gas (gaseous fuel) produced in the gas field, a liquid fuel processing apparatus (6) for pre-processing liquid fuel obtained during extraction and a refining process of the natural gas, and a gas turbine. The gas turbine (9) comprises a compressor (13) for generating compressed air, a combustor (4) for mixing the compressed air from the compressor (13) with one or both of the gaseous fuel pre-processed by the gaseous fuel processing apparatus (3) and the liquid fuel pre-processed by the liquid fuel processing apparatus (6), and for burning a gas mixture, and a turbine (14) for driving a generator (10) by combustion gases supplied from the combustor (4).