Abstract:Based on seismic and borehole data,we discuss typical facies types and geological significances of volcanic rocks of Yingcheng Formation and Huo-shiling Formation in Songliao Basin.The seismic facies can be divided into 4 types:moundy/lenticular shape-subparallel (M/L-SP),platy/sheet/shield shape-parallel/subparallel (P/S/Sh-P/SP),dome/moundy shape-vacant/disordered (D/M-V/D),and mushroom shape-disordered (M-D).The M/L-SP is correlated to rhyolitic or basaltic rocks,and corresponds to interbedding effusive facies and eruptive facies.This type facies has middle-good porosity,abundant vesicles,intergranular pores,and fractures,and favorable reservoirs might probably be developed,which are thick in the center of seismic facies unit and are thin in the distal part.The P/S/Sh-P/SP is correlated to basaltic lava or rhyolitic pyroclastic rocks,and corresponds to effusive facies interbedded with eruptive facies.With good-excellent porosity,abundant vesicles,intergranular pores,and fractures,several thick favorable reservoirs might be developed.The D/M-V/D is correlated to dacite or trachyandensite,and corresponds to intrusive facies and effusive facies.With fair-good porosity and abundant fractures,only one reservoir might probably be developed.The M-D is correlated to rhyolitic tuff,rhyolite or trachyandensite,and corresponds to interbedding eruptive facies and effusive facies.With good-fair porosity,abundant vesicles,dissolution pores,and fractures,several favorable reservoirs might be developed.
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