Abstract:

Tazhong low-uplift with abundant resources in Tarim Basin is a remnant Paleozoic uplift formed during late Caledonian and early Hercynian orogenies.The uplift possesses several multi sets of source beds and oil bearing horizons,several types of traps,multi stage of hydrocarbon formation,and are characterized by complex petroleum system.There are 4 kinds of oil and gas accumulation models:buried hill and anticlinal types of Lower Ordovician carbonate rock,overlapped stratigraphic type of the Carboniferous Donghe sandstone,faulted anticlinal and anticlinal types of the Carboniferous,anticlinal and lithological types of Silurian sandstone.Ordovician oil and gas bearing horizons are generally related to weathering crust,Silurian oil and gas accumulations are controlled by both structure and lithology,Carboniferous oil and gas accumulations are normally related to faults and unconformity.It is only by improving the technique of desert seismic exploration,the success ratio of oil and gas exploration could be increased,and giant oil and gas fields might be found in the pitching position of the uplift.