志丹油田Z72井区低阻油藏分层系开发对策研究  

Study on development strategy of low resistivity reservoir stratified system in Z72 well area of Zhidan Oilfield

作　　者：王成龙 周雪 刘姣[2] 谭虹 Wang Chenglong;Zhou Xue;Liu Jiao;Tan Hong(Zhidan oil Production Plant,Yanchang Oil Field Co.,Ltd,Yanan 717500;Exploration and Development Technology Research Center,Yanchang Oilfield Co.,Ltd.,Yan'an 716000)

机构地区：[1]延长油田股份有限公司志丹采油厂,延安717500 [2]延长油田股份有限公司勘探开发技术研究中心,延安716000

出　　处：《石化技术》2022年第12期154-156,共3页Petrochemical Industry Technology

基　　金：陕西延长石油(集团)有限责任公司科技计划,(项目编号:ycsy2019ky-c-2-3)。

摘　　要：志丹油田Z72井区主力层位为长3、长4+5和长6油层,其中长33和长61为低阻油层,是典型的多油层砂岩油藏。近些年由于低阻油层识别和层间非均质性的影响,Z72井区稳产难度逐年加大,油田开发效益难以维持。通过开展低阻油层成因分析、测井识别方法和二次解释研究,在长3和长6发现了所遗漏的228个低阻油层。同时根据三维地质建模和数值模拟研究,明确分层系开发界限为层间级差大于5,层间压差大于3MPa。并优化了细分方案,长33-长4+52三套亚组为一套层系,长61-长62两套亚组一套层系的方案最佳。将原菱形反九点井网转化为两套大五点井网,通过对两套独立的井网进行综合治理,取得了良好的开发效果。The main reservoirs in Z72 well area of Zhidan oilfield are Chang 3,Chang 4+5 and Chang 6 oil reservoirs,among which Chang 33 and Chang 61 are low resistivity oil reservoirs,which are typical multi-reservoir sandstone reservoirs. In recent years,due to the influence of low resistivity reservoir identification and interzone heterogeneity,the difficulty of stable production in well Z72 area is increasing year by year,and the oilfield development benefit is difficult to maintain. Through the genetic analysis,logging identification method and secondary interpretation study,228 low resistivity oil layers were found in Chang 3 and Chang 6. According to 3D geological modeling and numerical simulation,the development limits of stratified system are defined as the permeability difference between layers greater than 5 and the pressure difference between layers greater than 3MPa. The subdivision scheme is optimized. The three subgroups of Chang 33-Chang 4+52 were a set of layers,and the two subgroups of Chang 61-Chang 62 were a set of layers. The original rhomboid inverse nine-point well pattern was transformed into two sets of large-five-point well pattern. Through the comprehensive treatment of two sets of independent well patterns,good development results have been achieved.

关 键 词：志丹油田 低阻油层 分层系开发 数值模拟 

分 类 号：TE34[石油与天然气工程—油气田开发工程]