Abstract: The carboniferous structure is very complicated in the northwest of Junggar basin. It makes the research on the structure in this area difficult by the seismic and diplog interpretation for its diverse lithology and well-developed fracture. For those reason, the seismic and diplog data quality is poor. The downhole true formation occurrence can be provided directly with imaging logging. Furthermore, the structure shapes can be finely interpreted with logging data. The paper aimed at dividing the lithological layer of the volcanic layers and interpreting the true formation occurrence by the imaging characteristics. Finally, the structure of volcanic is dissected according to the regular pattern of multi-well stratigraphic occurrence, founding that there are two reverse faults in this complex steep structures area.The result shows that the new method of the interpreting of structure of volcanic reservoir is effective.

Key words: Junggar Basin, volcanic reservoir, imaging logging, multi-well stratigraphic occurrence, structural interpretation