Abstract: Based on the analysis of Carboniferous igneous lithological character and its lithofacies distribution，structural
evolutional process，fracture distribution law，known petroliferous and gas distribution area，relationship between lithological
character and oil-gas formation，physical properties of different lithological character and lithofacies，conditions of hydrocarbon
source. It is believed that in Carboniferous system where exist two sequences which are an upper sequence and a lower one at
Luxi area of Junggar Basin，and the superfaces of these sequences are regional unconformities. There are mainly four kinds
igneous lithofacies which are volcanic conduit facies，explosive rock facies，overflow facies，and volcanogenic sedimentation
facies，which distribute among different sequences. The embryonic form of Luliang uplift began at stage I of Mid-Hercynian
phase，and formed and strengthened at late-Hercynian phase. The best physical properties of lithofacies is the overflow facies，
the second one is explosive rock facies. The best physical properties of lithological character is basalt，the second one is volcanic
breccia. There are two favorable reservoir areas in Luxi，one locates at Xiayan 1 to Shinan 3 of the East Xiayan salient，and the
other one located at the West Xiayan salient and Sangequan salient. Hydrocarbon of Luxi came mainly from Mahu sag. This
paper presents that the oil and gas favorable places for prospecting mainly located at west areas of Xiayan salien and Sangequan
salient.

Key words: Junggar Basin, Luxi Area, volcanic phase, fracture, favorable places for prospecting