This thesis mainly focuses on ordivician carbonate strata in northern dagang oilfield , including stratagraphic correlation , every formation ' s lithofaces - paleographical distribution , carbonate diagenesis , reservoir characteristics and its affecting factors , paying close attention to qianmiqiao buried hill . the main results have been achieved as following : 1 . on the basis of many dividing schemes of ordivician strata that have been established since the liberation of nation , we determined another scheme of the studying area : ordivician is divided into three series : lower , middle and upper 主要成果表現在以下幾個方面: 1 、在綜合分析建國以來眾多研究學者對研究區奧陶系地層劃分結果的基礎上,提出了筆者的劃分方案,即將奧陶系三分:下奧陶統為冶里組和亮甲山組,中奧陶統分為下馬家溝組、上馬家溝組和峰峰組,上奧陶統缺失,并對各組的巖電特征進行了詳細論述。