东营凹陷北带下第三系深部储层的多重成岩环境及演化模式

he diagenetic environment and diagenetic evolvement model of clastic rocks in deep formation of Paleogene in north of Dongying sag were researched through thin-section analysis, scan electricity microscope observation, inclusion analysis, Ro test, and reservoir physical parameters analyses, etc and combining histories of tectonic development and organic maturation. It was recognized that the reservoir in deep formation has mulriple diagenetic environments, such as acidic environment, alkali environments and alternating between acidic and alkali environment. The forepart carbonate and feldspar dissolved but kaolinite and autogenic quartz developing in the same time are the symbols of acidic diagenesis environment. The alkali diagenetic environment is indicated by quartz grain and secondary quartz outgrowth cement dissolved, secondary feldspar outgrowth cement and carbonate deposited in the same time. The diagenetic environments of clastic reservoirs in Papeogene in north of Dongying sag have undergone a process from alkali – acidic - alternating between acidic and alkali （obvious alkali locally）- alkali - infirm 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. The diagenetic evolvement and reservoir reconstruct model in Sha 4 member in north of Dongying sag is built in the end.