胡尖山油田浅层C2油藏剩余油定量表征及成果应用

Quantitative characterization of remaining oil in shallow C2 reservoir of Hujianshan oilfield and its application

胡尖山油田浅层C2油藏历经20年的开发,已进入双高开发阶段,因此,对剩余油分布规律的认识有待于进一步深化。本次研究主要借助剩余油测井新技术及油藏数值模拟开展老区剩余油定量表征技术攻关,实现剩余油描述由定性向定量转变,不断提高剩余油预测精准率。明确了研究区剩余油富集三大主控因素:(1)受沉积韵律及底水锥进影响,剩余油在油井周围呈倒三角分布;(2)水驱较均匀,剩余油主要富集在油藏边部、水驱未波及区和套破井周围;(3)微构造高点控制了剩余油的分布,剩余油主要分布在构造较高部位[1]。根据剩余油分布规律,充分利用储层韵律特征及隔夹层的发育情况,对研究区进行加密侧钻调整部署,试验区取得了良好的效果,研究区最终采收率提高2.0%,为同类油藏的后期加密侧钻调整提供了一定的借鉴作用。

After 20 years of development,the shallow C2 reservoir in Hujianshan oilfield has entered the double-high development stage,therefore,the understanding of the distribution of remaining oil needs to be further deepened.In this study,the new remaining oil logging technology and reservoir numerical simulation are used to carry out the quantitative characterization of remaining oil in the old area,which can change the remaining oil description from qualitative to quantitative and improve the accuracy of remaining oil prediction.The three main controlling factors of remaining oil enrichment in the study area are defined as follows,(1)affected by sedimentary rhythm and bottom water coning,the remaining oil distributes in an inverted triangle around the oil well.(2)The water drive is more uniform,the remaining oil is mainly concentrated at the edge of the reservoir,the unswept area of water drive and around the damaged casing wells.(3)The distribution of the remaining oil is controlled by the microstructural high point,and the remaining oil is mainly distributed in the higher part of the structure.According to the law of remaining oil distribution,making full use of the reservoir rhythm and the development of intercalation,the study area is adjusted by infilling sidetracking,and good results are achieved in the test area.The final recovery of the study area is increased by 2.0%,it provides some reference for the later infill sidetracking adjustment of similar reservoirs.