PETROLEUM SYSTEM AND EXPLORATION STRATEGY IN SHAYA UPLIFT OF THE NORTHERN TARIM BASIN

There are two petroleum systems in Shaya uplift:southern one with marine source rocks and the other with terrestrial source rocks in the north.The two systems showed different characteristics in terms of key time,trap types of oil and gas pools,and occurrence.The major plays occurred in sequences older than the Jurassic in marine petroleum system,such as in Tahe area.The exploration targets are dominated by the Lower Ordovician buried hills or overturn anticline,the Triassic anticline-fault block and low amplitude anticline around salt dome,and the Carboniferous composite stratigraphic and structural traps.The major exploration targets in terrestrial petroleum system,such as in Yakela and Luntai areas,are mainly occurred in the Tertiary and Late Cretaceous structural traps and the Jurassic and Early Cretaceous stratigraphic traps.However,some attention should be paid to the Lower Paleozoic buried hills and overturn anticline in the area between Yanan fault and Luntai fault.