A Study On The Exploration Foreground Of The Permian In The North Structural Belt Of Taibei Depression In Tulufan-Hami Basin

The Tulufan-Hami basin is one of the most important oil/gas enriched large basins in the west of China. The Permian which is the important hydrocarbon mother rock exists in all of the basins in xinjiang.There is Permian lake facies mudstone which has big potence to produce hydrocarbon in the front structural belt of Bogeda mountain in the north of Taibei depression. It is difficult to evaluate the exploration foreground of the north structural belt and Taibei depressed basin,because the seismic data is bad and the tectonic is complex and there is less well in which the Permian can be reached In this article , some new messages of the foreground of exploration can be supplied according to the situation of the existence of Permian. The potence of producing hydrocarbon of the Permian in the south of Bogeda mountain is talked by the analysis of geological background and the character of lithology and sediment and the geochemical character of the mother rock and the trait of thermal evolution of the basin. According to that the potence to produce hydrocarbon of the Permian in Taibei depressed basin can be presumed.The tectonic-sedimentary and the depositional environment framework is talked by the analysis of the tectonic background, the trait of lithology and sediment the data of geochemistry. The conclusion is that:There is a deep basin which belongs to some of the rifted basin in Tulufan-Hami basin and its adjacent area in the region of interest in Early Permain ; The deep basin turned into depression basin in Middle Permain;Then the depression basin turned into foreland basin in Late Permain when the mountain turned up in the Bogeda region.The hydrocarbon mother rock of the Permain has been evaluated by the analysis of the Abundance,the Type and the Maturity of organic material. The conclusion is that:There is little hydrocarbon mother rock of early Permain remained of which the thermal evolution is deep; The mother rock of Middle Permain which is good in the Abundance,the Type and the Maturity is widespread. The mother rock of Late Permain of which the Abundance and the Maturity are low and the type is bad is evaluated as bad hydrocarbon mother rock..The thermal history is reaserched using the palaeotemperature scale means(i?o, fission track and inclusion thermometry) by the analysis of the regional thermal event and the tendency of thermal evolution. It is proved that the basins have experienced fast heating course in Permian, slowly cooling course in Triassic-Early Crataceous and primary steady course in Tertiary to nowadays; The hydrocarbon mother rock of the Permain began to produce hydrocarbon in late Indo Chinese epoch and bleeded off hydrocarbon in big mass in Yanshan-xishan epoch.