Abstract:

Based on the apatite fission track thermochronology, organic matter maturity index, apatite fission track thermal modeling and wellEASY%Ro inversion data, tectonicthermal evolution history in the Kuruketage areas were investigated. The apatite fission track thermochronology shows that Kuruketage uplift underwent three periods of tectonic movements, the Early Cretaceous (991244 Ma), the Late Cretaceous (6687 Ma) and  the Early Tertiary（28463）. Organic matter maturity data and apatite fission track thermal modeling reflect a Hercynian tectonic movement. Wellmodeling demonstrates that Palaeozoic source rocks in the Kongquehe slope reached maximum thermal evolution from the Late Silurian to the Early Devonian with maximum paleogeothermal gradient of 356 ℃/100 m. Paleogeothermal gradient was 31 ℃/100 m in  the  Late Jurassic and 415 ℃/100 m in the south depression of the Yanqi Basin in   the Late Jurassic. The Kongquehe slope was transferred from deposition to erosion owing to the strong Hercynian tectonic movements, which is important to oilgas accumulation. Thermal evolution of the Jurassic source rocks in the Kongquehe slope and Yanqi Basin stopped because of the Late Cretaceous uplift.

Key words:  fission track, tectonicthermal evolution, Kongquehe slope, Kuruketage uplift; , Tarim Basin