Evaluation method for distribution of high-quality hydrocarbon source rocks in low-exploration-degree area

The invention provides an evaluation method for distribution of high-quality hydrocarbon source rocks in a low-exploration-degree area, and belongs to the field of oil-gas exploration. An existing low-exploration-degree area is limited in rock core sample, few in analysis and test data and incapable of accurately evaluating high-quality hydrocarbon source rock distribution. The maturity and abundance of a stratum in a low-exploration-degree area are divided, a mature hydrocarbon source rock section with the high organic carbon content is found out to serve as a target hydrocarbon source rock section, and the gas logging total hydrocarbon content increasing multiple is determined according to gas logging total hydrocarbon content data of the target hydrocarbon source rock section. According to gas logging total hydrocarbon content data of a mature exploration area adjacent to the low-exploration-degree area in the same basin, the minimum gas logging total hydrocarbon content increasing multiple of the high-qua