Abstract:

Aimed at the fuzzy problems of the structural configuration of the Xiaoquzi region clear，and based on the previous understanding of the structure，we reexplain the seismic section in this region by making use of some geological data，such as earthquake，well drilling，ground and so on. The study shows that the anticline in the Xima village does not exist，and it is a nose structure with the anticline of the Demon Mountain pitching to the southwest. The new structural map shows that there are obvious rise in the area of trap and closure of the anticline in the north of the Xiaoquzi region，which is a favorable exploration target. A comprehensive analysis of the source condition，tectonic evolution，the evolution of the oil，gas and heat evolution，facies reservoir-capping assemblage and preservation condition，reveals that tectonic genesis is the key factor controlling the oil-gas reservoir. In Yanshanian，due to the tilt of the south area，the depressions in the Permain，Triassic and Jurassic systems turned into uplifts，which made part of the oil and gas in the syncline of Urumqi move to south area，and part of oil and gas migrate to the anticlinal zone in the south of the Xiaoquzi through fault. That is the important reason why there is no breakthrough in the Xiaoquzi region. The anticline of the south Xiaoquzi region was formed early，and has developed for a very long time. There is a big area of trap with high closure and good reservoir property. The anticline of the north Xiaoquzi region is a good assemblage of production，reserve and coverage，especially with the rise of the area of trap and closure；although the upper Cangfanggou group and the little spring group have bad conditions for reserve and reservoir forming，the middle and lower part of the lower Cangfanggou group and the stratum below are not drilled，so the reservoir conditions and reservoir forming conditions are our further study target.

Key words: Junggar Basin, structure, anticline, formation, exploration target