The difficulty of Carboniferous igneous exploration in the Chepaizi area which is located in the west edge of Junggar Basin was studied. The seismic reflection of reservoir rock is clutter，so it is difficult to predict the favorable reservoir and crack areas. According to the drilling and seismic data，the gravity，magnetic，electric data and the seismic prediction technology were used to study hydrocarbon source rock conditions，hydrocarbon accumulation conditions and the key exploration technologies of the igneous rocks. The results showed that the study area was uplifted successively in a long term since it was formed during the Hercynian，and it is favorable for hydrocarbon migration. The oil and gas from Changji sag and Sikeshu sag migrated into fractured-porous reservoirs of igneous rock through faults and fractures and then accumulated there. The igneous rocks should have hydrocarbon generating conditions，which maybe provide oil source and was able to form a self-sourced and self-reservoired oil and gas pool. The industrial oil and gas obtained from the thick igneous rock developed in Carboniferous in the Chepaizi area. The oil-bearing property of the igneous rock reservoir is mainly correlated with the degree of fractures development. According to the predicted results of igneous rock reservoir，fracture zone and crack distribution，32 wells were drilled successfully，among which 11 wells were drilled at industrial oil and gas. The controlled geological oil reserves were reported to be 6 101×104 t.