The Influential Factors Of Remaining Oil In The Northern Part Of Sabei Development Area

In this paper, the study object is Sa II reservoir group of Saertu oil formation in the middle and west field in the northern part of Sabei development area. By the full investigation and integration of existing remaining oil distribution research methods, which also combine the current development situation of research area and existing static data, the study on remaining oil distribution is carried out from three aspects, which are reservoir, tectonic and well pattern characteristics. In addition, the existing position of the remaining oil is predicted and the feasible suggestions is put forward on the development measures of the next step.According to the geological data and well logging data, each time unit channel sand body is combined finely on the basis of establishment of the isochronous stratigraphic framework. Meanwhile, the fine description of reservoir is being done, which include the study on internal architecture and interior compartment of the point bar of meandering river and narrow distributary channel, the study of reservoir horizontal and interbedded heterogeneity. And the pattern of remaining oil distribution in channel sand reservoir is obtained. Obtained the top structure map of Sa I and Sa II Oil Formation in study area by mapping the structure map of 1m equally spaced in integrating well logging and seismic, identified and counted the types of microtectonics of study area, then obtained the corresponding relationship between the types of microtectonics with the enrichment of remaining oil by analyzing the combination of production data in early and recent operation of wells near microtectonics. Finally the comprehensive analysis was summarized by the fine description of reservoir, the characteristics of well pattern and the date of well perforation layer. The main controlling factors of the remaining oil distribution in the study area are mainly the reservoir and well pattern. In the study area, there are 3 types of remaining oil distribution in the Sa II oil layer group, which are abandoned channel blocking type, river edge type and multidirectional connected type between injection and production well. And some scientific and reasonable development measures and suggestions are put forward, then clear oil field next adjustment plan, this has important significance for improving the degree of reservoir and restore the production.