Sub-salt carbonate rock structure-lithologic gas reservoir well position optimization method

The invention provides an under-salt carbonatite tectonic-lithologic gas reservoir well location optimization method, which comprises the following steps of: establishing evaluation indexes by adopting a visual representation form, and on the basis of drilling data and seismic data, comprehensively researching and determining under-salt tectonic-lithologic carbonatite gas reservoir natural gas enrichment control factors; according to industrial mapping such as a paleotectonic map, a nowadays tectonic map and a stratum thickness map, relevant parameters of well drilling point deployment are determined, finally, a gas-bearing comprehensive evaluation index is obtained through mathematical statistics and combined calculation, the known industrial gas flow with the highest yield is used as the maximum reference parameter, the known low-yield well is used as the minimum reference parameter, and the gas-bearing comprehensive evaluation index is obtained. Utilizing an index interval to screen well points favorable f