The invention relates to the technical field of well logging interpretation and relates to an igneous rock well logging multi-factor interpretion method. The method comprises the steps of (1) establish an igneous rock well logging interpretation database, (2) extracting a gas logging sensitive parameter and a rock pyrolysis sensitive parameter, (3) establishing an igneous rock gas logging oiliness index model, (4) establishing a rock pyrolysis parameter combination model, and (5) intersecting the gas logging oiliness index model and the rock pyrolysis parameter combination model to establish a well logging multi-factor interpretion plate. The invention is the well logging multi-factor interpretion method on the basis of gas logging and rock pyrolysis data, through extracting the gas logging sensitive parameter and the rock pyrolysis sensitive parameter, by using multiple gas logging well logging parameter fusion, a new parameter-gas logging oiliness index reflecting reservoir oil gas containing abundance is established, the gas logging oiliness index model and the rock pyrolysis parameter combination model are established, the application effect of the method in the aspect of igneous rock reservoir fluid property identification is good, and the well logging interpretation coincidence of an igneous rock reservoir is improved.