苏北盆地上白垩统泰州组烃源层评价

苏北盆地泰州组烃源层是国内少有的上白垩统烃源层,其有机质丰度高,干酪根类型为偏腐泥型,处于低熟—成熟演化阶段。尽管泰州组烃源层厚度较薄(20~30m),但近年来的勘探已发现9个由泰州组烃源层供烃的油藏。泰州组烃源层与电阻率"六尖峰"段相对应,该特征代表了发育于半深湖—深湖、半咸水—咸水环境、以化学成因为主的泥质碳酸盐岩及其有机质形成特征。

An evaluation of the source bed in Upper Cretaceous Taizhou Formation, Subei basin

As an Upper Cretaceous source rock rare in China,the source bed in Taizhou Formation,Subei basin,is high in organic matter abundance,sapropelic in kerogen type and lower mature-mature in thermal evoluation.The recent exploration has indicated that 9 oil reservoirs are charged by the source bed,although it is quite thin(20~30 m).The source bed is corresponding to a resistivity interval of "six peaks",which may represent a hemi-deep to deep lacustrine environment with brackish to salt water,where argillaceous carbonate and organic matter can deposit mainly by a chemical process.