Method and device for determining hydrocarbon expulsion efficiency of hydrocarbon source rock

The invention provides a method and a device for determining a hydrocarbon expulsion efficiency of a hydrocarbon source rock. The method comprises the steps of identifying and determining longitudinalhydrocarbon expulsion intervals of strong heterogeneous terrestrial hydrocarbon source rock stratum series according to core measured data and well logging data; according to the correlation betweenparameters, deriving a quadratic equation with one unknown on the hydrocarbon expulsion efficiency and determining the specific parameters required to solve the equation; according to the parameters such as the organic carbon content (TOC) of the hydrocarbon source rock, calculating numerical values of the specific parameters required by the equation; calculating the hydrocarbon expulsion efficiency KP of the hydrocarbon source rock according to the established quadratic equation with one unknown. According to the method, the simulation for complex hydrocarbon generation and expulsion processes is avoided; the method h