SEISMIC RESPONSE FEATURE AND DISTRIBUTION LAW OF CARBONIFEROUS VOLCANIC ROCK IN BEISANTAI UPLIFT

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.