东营凹陷下第三系深部碎屑岩储层成岩环境初探

he study about diagenetic environments of clastic reservoirs in Eogene formation in Dongying depression were studied through cores observation, rock slices identification, scanning electron observation , fluid inclusion study, Ro testing , clay mineral testing and physical parameters analyses of reservoir, combined with structural evolution, organic matter’s maturation and hydrocarbon-generating history, ancient temperature of Eogene formation in Dongying depression. The diagenetic environments of clastic reservoirs can separate into tow kinds. One is acidic diagenetic environments, which have forepart carbonate was dissolved, feldspar was eroded and kaolinite & quartz were produced in the same time；The other is alkali diagenetic environments, which have quartz was dissolved, feldspar were produced in the same time, and carbonate was deposited. The diagenetic environments of clastic reservoirs in Eogene formationin Dongying depression have undergone a change from alkali —acidic—alternate between acidic and alkali，and some places have clear alkali—alkali—infirmness alkali. The study about diagenetic environments are in favor of finding second pore which have different cause of formation, and finding out valuable clastic reservoirs in deep formation.