鄂尔多斯盆地西缘低对比度油层流体判识新方法  

A New Method for Fluid Identification of Low-Contrast Oil Layers in the Western Margin of Ordos Basin

作　　者：周妍 罗少成 牟瑜 雷琳琳 陈璐 林伟川 ZHOU Yan;LUO Shaocheng;MU Yu;LEI Linlin;CHEN Lu;LIN Weichuan(Geological Research Institute,China National Logging Corporation,Xi’an,Shaanxi 710077,China;Well Logging Key Laboratory,China National Petroleum Corporation,Xi’an,Shaanxi 710077,China)

机构地区：[1]中国石油集团测井有限公司地质研究院,陕西西安710077 [2]中国石油天然气集团有限公司测井重点实验室,陕西西安710077

出　　处：《测井技术》2024年第1期117-126,共10页Well Logging Technology

基　　金：中国石油天然气集团有限公司科学研究与技术开发项目“测井重大技术现场试验与集成配套”(2019D-3809)。

摘　　要：随着勘探开发的不断深入,油田勘探开发对象日益复杂化,油水层的低对比度特征愈加突出。受沉积微相、源储配置关系、充注程度等因素影响,低对比度油藏隐蔽性强、油水关系复杂,测井识别评价难度大,解释符合率偏低。因此,亟需建立有效的低对比度油层流体识别技术,提升测井解释精度。以鄂尔多斯盆地西缘环江西部长8储层为例,从研究岩性、物性、水性、含油性等方面入手,深入剖析研究区低对比度油层成因机理,研究认为地层水矿化度差异、束缚水饱和度高、油藏充注程度低是导致环江油田西部长8储层出现低电阻率、低对比度特征的重要因素。在此基础上建立流体敏感因子识别法;并从测井信号能量构成的角度出发,通过构建流体敏感测井曲线,基于小波变换算法,创新研发了多尺度小波能量谱流体识别技术;针对研究区油藏充注程度低,基于相渗实验创新形成了产水率细分油水同层评价方法。以上3种方法均有效提高了研究区低对比度油层流体性质判识能力,在低对比度油层识别方面应用效果显著。With the deepening of exploration and development,oilfield exploration and development objects are increasingly complex,and the low contrast characteristics of oil and water layers are more prominent.Influenced by various factors such as sedimentary microfacies,source-reservoir configuration,and injection degree,low-contrast oil reservoirs exhibit strong concealment,complex oil-water relationships,and a high difficulty in log identification and evaluation,resulting in a low interpretational matching rate.Therefore,there is an urgent need to establish effective technology for identifying fluid in low-contrast oil layers to enhance log interpretation accuracy.This article takes the example of the Chang 8 reservoir in the western part of the Huanjiang oilfield on the western margin of the Ordos basin.The research begins by studying lithology,physical properties,water properties,oil content,and other aspects,conducting an in-depth analysis of the genesis mechanism of low-contrast oil layers in the study area.The study suggests that differences in formation water salinity,high bound water saturation,and low reservoir injection degree are important factors leading to the appearance of low-resistivity and low-contrast characteristics in the Chang8 oil layer in the western part of the Huanjiang oilfield.Based on this analysis,a fluid-sensitive factor identification method is specifically established.Innovatively,from the perspective of the energy composition of logging signals,a multi-scale wavelet energy spectrum fluid identification technology is developed by constructing fluid-sensitive logging curves.To address the low injection degree of the reservoir in the study area,an evaluation method for subdividing oil and water layers based on capillary imbibition experiments is innovatively developed.The above three methods have effectively improved the ability to identify the fluid properties of low-contrast reservoir in the study area,and have a significant application effect in the identification of low-contrast reservoi

关 键 词：低对比度油层 流体识别 流体敏感因子 多尺度小波能量谱 产水率 

分 类 号：P631.84[天文地球—地质矿产勘探]