Study On Remaining Oil Distribution And The Potential Technology Of JZ9-3 Oilfield At Multi-scales

As gradual depletion of the onshore oilfields,offshore oilfields has become one focus for exploration and development in recent years.Large well spacing and high drilling cost are the basic characteristics of offshore oilfields.So there are several challenges,such as the collection of basic data,the reservoir geological modeling,remaining oil distribution,the technology for following stable production and so on.This article regard the JZ9-3 oil field as the research object,and conduct a survey about its surplus oil distribution patterns and control causes from multiple levels based on the researches at home and abroad.Firstly,according to the geological data in this area we established accurate geological model including building the structural model,building the sedimentary micro-facies model and interlayer insulation model using deterministic-random method,building porosity model and permeability model using a random method with sedimentary micro-facies model as a constraint,then verifying these models using fitting partition reserves.Secondly,this article conducted research about remaining oil distribution from the core,sand body and oil layer separately.The core level is mainly used to get accurate numerical model according to the experiment data to get remaining oil distribution mode,discussed three method which can improve polymer flooding development,and made sensitivity analysis of the reservoir as well as the injection parameters.The sandy body level is used to research the effects of interlayer insulation as well as the rhythmicity on the surplus oil distribution model,and combined with the research block to summarize the areas with the same kind of surplus oil distribution model.The layer is the key of this research and it is used to divide several kinds of the distribution modes under the current development stage and provided different countermeasures for each mode.Eventually,4 kinds of development plan was designed for JZ9-3 oilfield development.In general,level decides the production method.Reservoir layer uses series adjustment and flow field transformation,which is a main method of potential production.