利用测井方法识别火山岩岩相方法

Recognition method for volcanic rock facies by well logging

利用实际岩石薄片数据及测井数据,通过GR-TH及GR-AC交会图方法将松南气田营城组岩石结构划分为熔岩结构、熔结结构和凝灰结构3种。凝灰结构和熔结结构对应爆发相,熔岩结构对应喷溢相。结合次生孔隙度的大小及岩心、录井信息对出现的6种亚相:热碎屑流亚相、热基浪亚相、空落亚相、上部亚相、中部亚相和下部亚相进一步划分,其结果与地质上的岩相亚相基本一致。

Using actual rock slices and logging data, the rock structures of Yingcheng Formation in Songnan gas field was divided into lava, welding and tuff structures by the cross plots of GR-TH and GR-AC. Tuff and weld- ing structures correspond to explosive facies, while lava structure corresponds to extrusive facies. The six different subfacies （thermal debris flow, thermal base surge, airfall, upper, middle and lower subfacies） recognized by secondary porosity, core and logging data show a high accuracy compared with the actual geological results.