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 主要成果表现在以下几个方面： 1 、在综合分析建国以来众多研究学者对研究区奥陶系地层划分结果的基础上，提出了笔者的划分方案，即将奥陶系三分：下奥陶统为冶里组和亮甲山组，中奥陶统分为下马家沟组、上马家沟组和峰峰组，上奥陶统缺失，并对各组的岩电特征进行了详细论述。
