摘要
由于南苏丹P区块没有可用于确定油层水淹程度的密闭取心新井资料,且单层生产及试油数据非常少,开采与完井时间间隔较长,地层水性质相同导致底水水淹与油水同层难以识别,因此,水淹层解释难度较大.本文首先根据区块地质特征与开发特征及水淹层水源和水进方向,归纳总结出研究区油层的水淹类型为边水与注入水推进水淹型和底水推进水淹型,注水水淹和边底水水淹在电阻率测井响应特征上均表现为电阻率值的明显降低.其次,采用新老井相同层位测井信息对比方法,结合相邻老井生产动态测试结果,确定出新井典型水淹层,分析水淹层测井响应特征,优选出深侧向电阻率、浅侧向电阻率、深浅侧向电阻率幅度差、深侧向电阻率与冲洗带电阻率幅度差等4个水淹敏感参数,其中深侧向电阻率和深浅侧向电阻率幅度差为最有效的水淹识别参数.利用深侧向电阻率值与深浅侧向幅度差交会,建立了水淹层定性识别图版,利用该图版可有效地区分水淹层与水层和油层.基于储层岩性物性测井响应特征分析,采用岩心刻度测井方法,建立了水淹层泥质含量、孔隙度、渗透率、饱和度等参数定量解释模型,利用计算的驱油效率值可有效地划分弱水淹、中水淹、强水淹.综合水淹层定性识别图版法以及定量解释方法,结合邻井生产动态,建立了水淹层综合测井评价方法,经实际井验证证明该方法结合了静态测井解释与动态生产数据在水淹层评价中优势,提高了水淹级别测井综合评价准确性.采用开发初期井连井剖面对比方法,确定出油水同层顶界面海拔深度,再结合邻井开发动态,寻找出新井水源,判断出新井水淹类型.对于底水水淹类型,新井不存在油水同层,只能为水淹层;对于边水水淹类型,将解释油水同层或水淹层海拔深度高于最高油水同层顶界面海拔深度的储层判定为�
Evaluation of water-flooded layers is difficult in P Block,South Sudan because of no new sealed coring wells,less single production zone or oil testing zone, long interval from completion to production. Also,bottom water flooded layers and oilwater layers are difficult to be distinguished because of much the same salinity of bottom water and formation water. Firstly,according to the characteristics of geology and development,and water source and advance direction of water-flooded layers,the water-flooded types in the area can be divided into edge water and injection water flooded type,and bottom water flooded type,with obviously reduced presentation in resistivity log value. Secondly,typical water-flooded layers are determined based on the production data of adjacent old wells,and comparison of log information in the same layer for new and old wells. By analyzing the log response characteristics of typical water-flooded layers, RD,RS,RD-RSand RD-RXOare selected as sensitive parameters to determine water-flooded layers,of which RDand RD-RSare the most effective parameters. Thirdly,the qualitative identification chart is established to distinguish the water-flooded layer from the water layer and oil layer with RDand RD-RS. Based on the log response characteristics of lithology and petrophysical property of the reservoirs, core calibration logging technology is used to establish the quantitative interpretation models of shale content,porosity,permeability and saturation. Further,Water-flooded layers can be divided into low-flooded,middle-flooded and high-flooded by calculated oil displacement efficiency. Fourthly,the comprehensive evaluation method of water-flooded layers is established, based on the qualitative identification chart, the quantitative interpretation method and production data of adjacent wells. Testing of interpretation results of water-flooded zones shows that the comprehensive evaluation method combines the advantages of static log interpretation and dynamic production data in evaluation of water-f
作者
赵国良
宋延杰
黄奇志
郭志华
杨原军
张玉金
国萃
ZHAOGuo-liang;SONGYan-jie;HUANGQi-zhi;GUOZhi-hua;YANGYuan-jun;ZHANGYu-jin;GUOCui(Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;College of Geo-science,Northeast Petroleum University,Heilongjiang Daqing 163318,China;Accumulation and Development of Unconventional Oil and Gas,State Key Laboratory Cultivation Base Jointly-constructed by Heilongjiang Province and the Ministry of Science and Technology,Heilongjiang Daqing 163318,China;3GLand(Beijing)Technology Company Limited,Beijing 100107,China)
出处
《地球物理学进展》
CSCD
北大核心
2019年第1期266-277,共12页
Progress in Geophysics
基金
中国石油天然气集团公司科学研究与技术开发项目(2016D-4401)
黑龙江省自然科学基金项目(D2015012)
东北石油大学研究生创新科研项目(YJSCX2016-003NEPU)联合资助
关键词
水淹层
注入水、边水和底水
定性测井解释
定量测井解释
动态生产分析
底水水淹层与油水同层
Water-flooded layer
Injection water,edge water and bottom water
Qualitative log interpretation
Quantitative log interpretation
Production performance analysis
Bottom water flooded layer and oil-water layer
