Method for predicting source rock by paleoenvironment restoration

A method for predicting a source rock by paleoenvironment restoration, comprising the following steps of:

• (1) measuring a content of each mineral by macro and micro element experiments;
• (2) according to the measurement results, judging whether a sedimentary environment is a marine facies or a non-marine facies by utilizing element combination forms of Sr/Ba, B/Ga, Th/U, Fe/Mn and Sr/Ca;
• (3) judging a specific numerical value of a paleosalinity through a boron element and comparing the same with a current normal seawater value to deduce whether the current sedimentary environment is a saline water or non-saline water sedimentary environment;
• (4) judging an oxidation or reduction environment during sedimentation through element combination forms of (Cu+Mo)/Zn and V/(V+Ni);
• and
• (5) comprehensively analyzing the sedimentary environment judged in the steps (2) to (4), recovering a relationship between a palaeosedimentary environment and a source-reservoir configuration, analyzing a shale development and distribution rule according to the relationship, pointing out a reservoir-forming favorable combination, finally performing source rock evaluation with reference to drilling, oil testing and logging data, and finally predicting a relatively high-quality favorable area for source rock development and distribution.