Abstract:

        The interactive formation of Carboniferous volcanic rock and sedimentary rock set is widely developed in the northwest margin of Junggar Basin. The profile vertical sequence is made up of several sets of volcanic rocks and sedimentary rocks. This paper takes Carboniferous volcanic rocks and sedimentary rocks of the zones Six, Seven, Nine of Karamay oilfield for examples. We use the actual data of seismic, borehole, drilling core, electrical property, and try to put forward a method of stratigraphic division in Carboniferous formation,northwest margin of Junggar Basin. We first divide the stages of volcanic rock and sedimentary rock, build the distribution mode of the multiple stages of volcanic rock and sedimentary rock lithofacies, quantitatively describe the developed extent of different lithological fractures, and discuss the relationship among lithology, lithofacies, fractures and the forming of reservoir.The Carboniferous fracture developed range of the zones Six, Seven, Nine are determined and this can provide a scientific basis for the successive exploration and development in this area. 

Key words: Junggar Basin, Carboniferous, volcanic rock, lithology-lithofacies, fracture