Abstract:

Good results were obtained in exploration in the east part of the JunggarBasin in recent years, and a new oilfield-Huoshaoshan Oilfield and three struc-tures with commercial oil flow were discovered. The basement of the present area is Middle Carboniferous pyrogenic rocks,and the covering strata has undergone several tectonic moyements. The source stage was mainly in the Hercynian, then the Indosinian and Yanshan; the accumulation and destruction of oil and gas was in Yanshan movement. In the north margin of the Karameili piedmont. the dovelopment of theself-generating and self-reservoiring sequence of the Permian Pingdiquan Formation has controlled the distribution of the oil and gas in this area, that is to say, all those places where the sediments are thick and were not denuded in the late stage are possible zones for hydrocarbon distribution, and all the temperate-amplituded uplifts, fault-blocks and nozes within the zones are favourable structures for hydrocarbon prospecting. In the south margin of the basin,the slope sides of the mid-amplituded uplifts, fault-uplifts and bald-headed structures near the oil generation depression are favourable places for hydrocarbon distribution. Faults in the east part of the basin controlled oil and gas distribution in several aspects.