Abstract:

Volcanic rock is the main reservoir of the Carboniferous System in Beisantai uplift area.There are three vocanic cycles through the identification of volcanic

phase in the well and the classification of volcanic cycle.The correspondence relationship between vocanic phase in the well and seismic responce feature adjacent the well

can be determined through composite seismogram demarcation technique.Through the seismic interpretation of volcanic cycle interfaces by using 3D seismic data and the

classification of seismic phase of volcanic cycles，five main seismic phases can be identified.The seismic phase can be transformed into volcanic phase according to single

well phase demarcation relationship，so that the distributary feature of carboneferous igneous rocks is reconstructed.Through the synthesis of some elements，which are the

denudation degree of the upper Carboniferous system，the development of the faults，the distribution feature of the volcanic phase，the development of cap rock on

Carboniferous system，the display of oil and gas in the well and the distance with hydrocarbon generation sunken，favorable area of oil and gas exploration in Carboniferous

system volcanic rocks in Beisantai uplift can be confirmed.

Key words: Junggar Basin, Beisantai uplift, volcanic rock, seismic phase, area prediction