摘要
陆相页岩储集层具有低孔特低渗特征,其黏土矿物含量高,岩石组成变化快,地层非均质性强,利用传统阿尔奇公式及常规数理统计模型计算的含水饱和度误差大。为提高陆相页岩储集层含水饱和度计算精度,以川东南复兴区块下侏罗统凉高山组页岩为例,分析了现有含水饱和度测井计算方法的局限性,阐述了利用阵列声波测井中的纵横波时差与测井密度组合重构的复合波阻抗计算含水饱和度的可行性。在此基础上,提出了陆相页岩储集层含水饱和度计算方法。该方法考虑了岩石矿物的影响,有效避开了电法测井和非电法测井的局限性,提高了适用性。在川东南复兴区块多口井凉高山组页岩储集层的应用效果好,计算得到的含水饱和度与岩心分析含水饱和度较吻合,绝对误差为1.3%~2.2%,满足测井评价要求。
Continental shale reservoirs are characterized by low porosity,ultra⁃low permeability,high clay mineral content,rapid mineral composition variation,and strong formation heterogeneity.Therefore,the water saturation calculated with Archie formula or conventional mathematical statistical models often introduces large errors.To improve the calculation accuracy of water saturation in continental shale reservoirs,taking the shale from Lower Jurassic Lianggaoshan formation in the Fuxing block of southeastern Sichuan basin as an example,the limitations of existing methods for calculating water saturation were analyzed,and the feasibility of applying the composite wave imped⁃ance reconstructed from the combination of P wave and S wave in array acoustic logging and logging density to calculate water saturation was demonstrated.Based on this analysis,a method for calculating water saturation in continental shale reservoirs was proposed.This meth⁃od considers the influence of rock minerals and effectively avoids the limitations of electrical logging and non⁃electrical logging,and finally improving applicability.The application of this method has yielded favorable results in multiple wells in the shale reservoirs of Liang⁃gaoshan formation,southeastern Sichuan basin,with calculated water saturation closely matching those from core analysis,and absolute er⁃rors ranging from 1.3%to 2.2%,meeting the requirements for well logging evaluation.
作者
程丽
严伟
李娜
CHENG Li;YAN Wei;LI Na(Research Institute of Geophysical Exploration,Exploration Company,Sinopec,Chengdu,Sichuan 610041,China;Research Institute of Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay,Xinjiang 834000,China)
出处
《新疆石油地质》
CAS
CSCD
北大核心
2024年第3期371-377,共7页
Xinjiang Petroleum Geology
基金
中国石化科技部项目(P22159)。
关键词
川东南
复兴区块
凉高山组
陆相页岩
含水饱和度
复合波阻抗
阵列声波测井
southeastern Sichuan basin
Fuxing block
Lianggaoshan formation
continental shale
water saturation
composite wave imped⁃ance
array acoustic logging
