PRELIMINARY DISCUSSION ON GEOLOGICAL DISTRIBUTION OF METAMORPHIC CORE COMPLEX AND HYDROCARBON IN KUCHE DEPRESSION
库车坳陷变质核杂岩与油气相态分布格局成因初探

The distribution of oil and gas in the Kuche depression has a special feature,that is, "gas in the east,oil in the west" and the maturity of natural gas "higher maturation in the north,lower maturation in the south." The analysis of the distribution of the metamorphic core complex,the evolutionary degree of the source rock and the difference of geothermal gradient in the Kuche depression reveals the appearance of the metamorphic core complex may be the immediate cause.It is the existence of the metamorphic core complex that causes the different degree evolution of the hydrocarbon source rock in different areas and also controls the lateral changes of the hydrocarbon phases.The matching connection between the effective hydrocarbon source rock in Jurassic and the other factors of formating-resource in Kuche is also influenced by the time of formation of the metamorphic core complex.