辽河坳陷大洼地区火山岩特征及储层识别

辽河坳陷大洼地区中生界发育玄武岩、安山岩等8类火山岩,其中玄武质火山角砾岩、安山岩为该区的优质储层;玄武质火山角砾岩储集空间主要为残余粒间孔、溶孔、气孔和裂缝,安山岩储集空间主要为溶孔,二者均为中高孔、低渗储层。应用测井曲线GR与DEN交会、CNL与RT交会能够对火山岩及优质储层进行有效划分。应用波阻抗反演、属性分析等方法对火山岩优质储层的分布进行识别,为该地区的火山岩勘探提供了依据。

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.