The Carboniferous volcanic reservoir in Wulungu depression is an important target stratum for hydrocarbon exploration in Junggar Basin.However,due to its deep burial,complex lithology and strong late reformation,it is difficult to depict the distribution of volcanic rock masses by relying on the previous two-dimensional seismic exploration technology.Mainly based on the seismic data collected by low frequency vibroseis,the authors studied the distribution characteristics of Carboniferous volcanic rocks in the northern part of Wulungu depression.In view of the advantages of low-frequency information in deep-layer imaging and the good reflection of stacked section to structural trends,low-frequency stack section was used to identify wave field,which can guide migration section interpretation.Then by combining geological,seismic and drilling data,research on volcanic rock identification was carried out.The seismic response characteristics of volcanic facies in this area were summarized.The distribution of volcanic rocks was identified and characterized by means of seismic reflection characteristics and seismic attribute analysis.A low-frequency seismic identification method for volcanic reservoirs suitable for deep-buried complex lithologic conditions is explored.It provides a basis for Carboniferous oil and gas exploration in this area.
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