南海西部X油田水淹层定性识别方法研究及应用  

The Research and Application of Qualitative Identification Method in Water-flooded Reservoir in X Oilfield in the Western South China Sea

作　　者：孙殿强 高云龙 余涛 王锋 谢献辉 刘进华 Sun Dianqiang;Gao Yunlong;Yu Tao;Wang Feng;Xie Xianhui;Liu Jinhua(CNOOC(China)Ltd.Zhanjiang Branch,Zhanjiang,Guangdong 524057,China;CNOOC EnerTech-Drilling&Production Co.,Zhanjiang,Guangdong 524057,China;China-France Bohai Geoservices Co.,Ltd.,Zhanjiang,Guangdong 524057,China)

机构地区：[1]中海石油(中国)有限公司湛江分公司,广东湛江524057 [2]中海油能源发展股份有限公司工程技术湛江分公司,广东湛江524057 [3]中法渤海地质服务有限公司湛江分公司,广东湛江524057

出　　处：《海洋石油》2025年第1期63-67,共5页Offshore Oil

摘　　要：对于海上注水开发的砂岩油藏,随着油田的开发进入水淹阶段,如何快速定性识别水淹层亟需解决。水淹层测井响应特征变化主要表现为电阻率下降,对原始电阻率重构成为水淹层定性识别的关键手段。通过结合岩石物理体积模型,分析水淹层导电机理和影响因素,推导出砂岩油藏水淹层导电模型。基于束缚水饱和度以及印度尼西亚饱和度计算公式反算地层原始电阻率并利用MRGC神经网络法重构了地层原始电阻率。两种方法计算结果在油层段与测井曲线值大小一致,在水淹层段与邻井同层位原始电阻率对比大小一致。利用重构曲线与当前电阻率曲线形成的包络幅度差进行水淹层定性识别,并建立了水淹层定性识别图版。通过水淹层识别图版可以定性指示储层水淹情况,为油田控水增油及调整开发提供了快速可靠依据。For offshore water flooding sandstone reservoir,it is urgent to address how to quickly and qualitatively identify the water flooding layers during the water flooding stage.The main change of logging response characteristics is resistivity in water flooding layer,then the original resistivity reconstruction becomes the key for identifying water flooding reservoir.Based on rock physics model,the water flooded layer conductive mechanism and the influencing factors are analyzed,and the sandstone reservoir volume conduction model is established.The original resistivity of the formation was calculated by the calculation formulas of bound water saturation and Indonesian saturation,and reconstructed by using the MRGC neural network method at the same time.The results of the two methods are the same with adjacent well logs in the same layer.A method for qualitative identification of water flooded zones using the envelope amplitude difference between the reconstructed curve and the current resistivity curve is proposed,and a qualitative identification chart for water-flooded zones is established.The identification chart of water flooded layers can qualitatively indicate the water flooded situation of reservoirs,and provide a fast and reliable basis for oilfield water control and oil production increase as well as development adjustment.

关 键 词：南海西部油田 水淹层 原始电阻率 曲线重构 体积模型 神经网络 

分 类 号：P631.81[天文地球—地质矿产勘探]