Characteristics and reservoir prediction of volcanic rocks in Dawa area of Iiaohe depression

Eight types of volcanic rocks,such as basalt and andesite are developed in Mesozoic in Dawa area,Liaohe depression,including the ones with high-quality reservoir such as basaltic volcanic breccia and andesite.Through observing the drilling core samples,the reserve space of basaltic volcanic breccia is mainly composed of residual inter-granular pores,pores,pores and cracks,and the reserve space of andesite reservoirs are mainly dissolved pores,both of which are medium and high porosity and low permeability reservoirs.Application of logging curve GR intersection with DEN,CNL and RT intersection of volcanic rocks and high-quality reservoirs were effectively divided.The distribution characteristics of high-quality volcanic reservoirs are predicted by wave impedance inversion and attribute analysis,which provide good basis for volcanic exploration in this area.