Volcanic Characteristics And The Prediction Of Volcanic Reservoir Of Yingcheng Formation In Changling Fault Depression

Since the 20 th century,the exploration of volcanic rocks has made a breakthrough.A lot of achievements have been made in volcanic rock,volcanic edifices,volcanic mechanism and geophysical identification technology.However,many problems still restrict the development and application of volcanic gas reservoir.Such as,the lack of volcanic stratum theory can be used to describe the volcanic formation in detail,which leads to difficulties in the study of volcanic stratum structure.It is not clear to establish the corresponding stratum structure of seismic reflection structure,so that the interpretation of volcanic rocks is multi-solution.On the macro scale,there are few studies on volcanic rock,edifices and volcanism,and lack of a holistic understanding of volcanic rocks.This paper studies volcanic rock,edifices and volcanic-stratigraphic mechanism by combining geophysical methods and drilling data with the volcanic rocks in changling fault depression of songliao basin.Set up a volcanic strata framework,classification of typical volcanic mechanism modeling,and try to through volcanic rock lithology,lithofacies,volcanic institutions,episodes of volcanic eruption,volcanic instantaneous frequency five kinds of composite properties.Finally,the favorable reservoir for volcanic rocks in the region can be predicted.Studies have shown that,due to volcanic eruption and magmatism,the volcanic formation interface can be formed into four types: eruption conformity surface,eruption unconformity surface,intermittent unconformity surface and invasion unconformity surface.By geophysical characteristics identification of lithology/lithofacies,lava,pyroclastic rock structure/structure,lava,pyroclastic rock surface structure,weathering crust,sedimentary layers,seven geophysical properties such as wear section surface of discontinuity.In the research area,the skeleton of the shaft-well-borehole volcanic formation is established.On the basis of lithology and internal flow unit,the volcanic edifices can be divided into 4 types,including acidic lava volcanic edifices(single flow units and composite flow units),rhyolitic lava debris volcanic edifices,and basaltic lava volcanic edifices.Combining with the volcanic eruption cycle,volcanic mechanism type,volcanic structure and volcanic rock and rock facies to predict that the volcanic rocks in songsouth gas field and the surrounding yingcheng formation are favorable.