ANALYSIS ON CONTROL OF TECTONIC STYLE TO PETROLEUM IN THE QAIDAM BASIN

Based on the basic characteristic study of tectonic style in the Qaidam Basin, the control of tectonic style to petroleum is analysed in this paper from the relation between the develpment of tectonic style by stages and the distribution of hydrocarbon source rocks by areas, the petroliferous properties of tectonic style, the reformation of tectonic style to oil and gas pools, etc. It is pointed out that the hydrocarbon source rocks formed in the development stage of extensional tectonic style in the early of the Yanshanian are mainly distributed in the north of the basin, those formed in the development stage of the Tertiary compressional tectonic style distributed in the west of the basin, and those formed in the development stage of strongly-compressional tectonic style in the late of the Himalayan distributed in the middle of the basin. The growth anticline is major oil-bearing tectonics. The fault propagation anticline controlled by recoil fault is important hydrocarbon-bearing tectonics. The longitudinal bend anticline in oil-generating areas can form oil pools. And the longitudinal bend anticline in Sanhu region is gas-bearing tectonics. The pools formed by the Early-Middle Himalayan compressional tectonic style regularly reformed by the strong compressional tectonic style of the Late Himalayan. The extensional structural style on the core of anticlines has reformation effects on oil and gas pools.