Quantitative evaluation method for hydrocarbon generation quantity, hydrocarbon expulsion quantity and hydrocarbon retention quantity of source rock

The invention provides a quantitative evaluation method for hydrocarbon generation quantity, hydrocarbon expulsion quantity and hydrocarbon retention quantity of source rock. The quantitative evaluation method comprises the following steps that TOC (Total Organic Carbon) of a source rock sample of a research region target layer is acquired; thermal simulation experiments are performed on the source rock sample of the research region target layer; the thermal simulation experiments are a set of semi-opened system simulation experiments of hydrocarbon generation and expulsion with different preset temperatures; the preset temperatures are temperature rising end points of the simulation experiments of the hydrocarbon generation and expulsion; a first parameter at different preset temperature is acquired according to the result of each semi-opened system simulation experiment of the hydrocarbon generation and expulsion; a first model and a second model are built according to the TOC of the source rock sample and the first parameter; the hydrocarbon generation quantity, the hydrocarbon expulsion quantity and the hydrocarbon retention quantity of the source rock are quantitatively evaluated by means of combining the first model and the second model.