Oil and gas source identifying method suitable for heterogeneous salt-lake basin

The invention relates to an oil and gas source identifying method suitable for a heterogeneous salt-lake basin and belongs to the technical field of oil gas exploration and development. The method is characterized in that oil population and source rock population of the heterogeneous salt-lake basin are divided by acquiring basic geological data. According to the division results of oil population and source rock population of the heterogeneous salt-lake basin, the oil and gas source of the heterogeneous salt-lake basin is judged. The principle of the similar sedimentary environment and maturity of crude oil and oil source rock is fully applied to the method, and population division is executed to the crude oil and the oil source rock through clustering analysis, thereby creating the corresponding relationship between the crude oil and the oil source rock. According to the corresponding relationship, the single-uplift and single-depression oil gas in the heterogeneous salt-lake basin can be effectively identified. A mathematical model established by gamma cerane/C31 homohopane (22S) parameters is applied to the single-uplift and multi-depression tectonic zone of the heterogeneous salt-lake basin, so that the source proportion of oil and gas in different depression zones can be clearly distinguished, and exploration of depression oil and gas can be effectively guided.