Abstract: The petrologic make-up and the heavy mineral feature analyses show that J₂x^1-2 reservoir sands of Shanle area in Tuha basin are good in sand compositional maturity with a typical rock assemblage dominated by dacite, dacite liparite, intermediate-basic extrusive rock and intermediate-basic tuff debris, but poor in sand structural maturity and sorting with angular-subangular quartz clasts; the sand heavy minerals appear in an unstable typical mineral association, and the diagenetic environment is weak.Integrated with macro-and fine formation correlation and depositional setting analysis, it is clarified that the J₂x^1-2 reservoir sands belong to sedimentary system of the north sources.This paper suggests that the source analysis of foreland basin should be made considering micro-stratigraphic feature, environment conditions, etc., which could be as a guide for similar source supply studies in the future.

Key words: Tuha basin, Shanle area, typical mineral, single mineral, heavy mineral, diagenetic environment, reservoir rock, micro feature