靖边油田郑寺区长21油层沉积微相研究

Study on sedimentary microfacies of Chang 21 oil formation in Zhengsi area of Jingbian oilfield

靖边油田郑寺区主力产油层系为长21油层,当前的开发面临着区块高含水率井多、油井利用率低等诸多问题,因此,亟需开展各小层沉积微相特征研究,为下一步措施挖潜、高含水率治理等治理措施提供依据。本文对郑寺区长21油层亚组各小层沉积微相类型及特征开展了研究工作。研究认为,研究区长21油层各小层沉积微相类型主要包括分流河道、分流间湾和天然堤,各类沉积微相具有不同发育特征。研究区长21油层各小层沉积微相平面展布具有一定的继承性但又存在一定的差异。在之后的开发过程中,应充分考虑各小层沉积微相特征差异,从而更加科学的进行综合治理工作。

Chang 21 oil formation is the main oil-producing reservoir in Zhengsi area of Jingbian oilfield.The current development is faced with many problems such as high water wells and low utilization rate of oil wells.Therefore,it is urgent to carry out research on sedimentary microfacies characteristics,so as to provide basis for further measures such as potential exploitation and high water cut treatment.In this paper,the sedimentary microfacies types and characteristics of each small layer of Chang 21 oil formation in Zhengsi area are studied.It is concluded that the sedimentary microfacies types in Chang 21 oil formation of the study area mainly include distributary channels,interdistributary bays and natural levees,and all sedimentary microfacies have different developmental characteristics.The planar distribution of microfacies in the small layers of Chang 21 oil formation in the study area has certain inheritance but some differences.In the subsequent oilfield development process,we should fully consider the differences of microfacies characteristics of each small layer,so as to carry out comprehensive management work more scientifically.