Comprehensive Research On Volcanic Rock Lithofacies Of 1^st Section Of Yingcheng Formition In Xujiaweizi Fault Depression Of Northern Songliao Basin

The essay based on the long coring of Yingyi section in the Xujiaweizi area of Songliao basin, analyse the characteristic of the volcanic lithology and volcanic facies through the observation and description of drill core,do research on the distribution of volcanic facies. Hope the research can offer the theory supports for the further exploration and development of Xushen gas field.The findings make known that the Yingyi section develops lava and athrogenic rock.The mainly type is generalized athrogenic rock which embody athrogenic rock, welded pyroclastic rock and alloclastic lava.The volcanic rock in this area is divided into 5 facies and 16 intrafacies.By the research on volcanic lithology and volcanic facies,unite the core,well logging and seismic data , volcanic logging and seismic interpretation models in Xingcheng area are founded.In this way the nature of volcanic lithofacies can be determined.Do detailed analysis on the volcanic facies of six long–coring wells and determine lithofacies types. Verify the types of volcanic facies of plane section by drawing up six plane sections of well tie. The lithofacies distribution of volcanic cycles in Yingcheng Formation in Xingcheng Area is predicted according the core,well logging and seismic data.Lithofacies mode of this area can be built through the character of lithofacies distribution.