Petro-gas Geology Characteristics and Exploration Potential of Zhongguai Uplift in Northwestern Margin of Junggar Basin

According to the phenomenon of uncertainty in fractures controlled factors,difficulty in delineating structural traps and low exploration degree,main geological characteristic of oil,accumulation condition of oil gas,exploration potential of oil gas at Zhongguai uplift is shown. It is indicated that Zhongguai Uplift experienced a complete tectonic spinning; the tectonic movement is fairly stable and has the beneficial accumulation condition of oil gas. The hydrocarbon source rocks in carboniferous are mainly dark peat and tuffite of P1j,holding good hydrocarbon generating conditions. The Porosity and permeability of brecciated lava and andesite are better among the volcanic rocks,with good reservoir characteristics and the fracture-pore dual media characteristics. Development of regional shale cap-rock of P3w and local mudstone cap-rock of P1j,the combination of reservoir and cap-rock is much better. In multi-stage tectonic movements,it has formed structural traps,and because of unconformity,it has formed buried hills traps,eroded strata traps,stratigraphic overlap traps. It has the favorable condition of petroleum formed. In the study area,faults,fractures and unconformity are extremely developed,and it provides good conditions for the vertical migration and lateral migration of oil and gas,provided with a huge exploration potentiality. Guiding significance is provided for comprehensive reservoir interpretation,determination of exploration direction and remaining oil redevelopment.