Abstract: Applying the technique of apatite fission-track length analysis, selecting Australia fanlike model, and along three most possible paths of thermal history, this paper makes numerical simulation of the analytical length distribution of Lower Cretaceous in Q-5 Well, Minan area. Through comparison with the measured length distribution, the reasonable geological evolution history of this well is determined. The simulation study shows that Cretaceous of Q-5 Well has ever been in the maximum burial depth (3 500m) of its evolution history 70 million years ago, followed by undergoing tectonic uplift and denudation, and resulting in the maximum eioded bickress of it is 2 500m.

Key words: apatite, fission-track dating, distribution, numerical simulation, Cretaceous