深层高岭石的发育特点、形成转化机理及其研究意义

By means of core drlling and micro-observation, SEM , X-ray of clay mineral, physical property and oil-bearing level analysis, it has been confirmed that, in the Eogene of Bonan sub-sag, diagenetic kaolinite developing with feldspar solution and secondary quartz; high physical property sandstone reservoirs and high oil saturation reservoirs were found with a large amount of diagenetic kaolinite developing. The kaolinite resulted from acidic fluid and sandstone alkalescence feldspar interaction, be preserved in inert diagenetic field which filled with oil, and transformed to illite or chlorite in alkalescence diagenetic field. The study on kaolinite in deep burial strata of the Eogene clastic reservoirs could promote exploration and exploitation, and can help to analyse the forming conditions of hydrocarbon reservoirs and diagenetic field dynamicly.