含钙质致密油储层电阻率校正及饱和度评价方法  

Research on Resistivity Correction and Saturation Evaluation Method of Calcareous Tight Oil Reservoir

作　　者：刘志远[1] 李浩[1] 郭宇豪 赵宁[2] 陈志强 LIU Zhiyuan;LI Hao;GUO Yuhao;ZHAO Ning;CHEN Zhiqiang(Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu, Sichuan 610500, China)

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院,北京100083 [2]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500

出　　处：《测井技术》2022年第3期326-333,共8页Well Logging Technology

基　　金：中国石油化工股份有限公司重点科技攻关项目“川西须三段流体识别评价及储层预测研究”(P20061-2)。

摘　　要：电阻率是测井饱和度评价的基础,由于储层含钙质使电阻率增大,导致电阻率不能准确反映储层的含油性,使储层测井饱和度评价困难。针对此类问题,以岩石物理实验为基础,结合测井响应特征分析,建立含钙质储层饱和度评价方法:基于含钙质砂岩岩石体积物理模型,推导得到含钙质储层孔隙度计算模型;通过铸体薄片、X衍射、岩电实验等配套岩石物理实验,建立含归一化电阻率、声波时差及孔隙度等参数的钙质含量计算模型;在明确含钙质储层电阻率测井响应特征的基础上,对电阻率值进行钙质影响校正,建立考虑钙质含量的变参数阿尔奇模型。用该方法对四川盆地公山庙油藏凉高山组致密油储层测井资料进行处理分析,结果表明:该方法明显提高计算的含油饱和度精度,绝对误差小于5%,为含钙质致密砂岩储层饱和度计算提供新的思路和方法。Resistivity is the basis of saturation evaluation.The increase of calcium content leads to the increase of the reservoir resistivity and resistivity cannot accurately reflect the oil content of the reservoir,which makes it difficult to evaluate the reservoir saturation.Aiming at the above problems,based on petrophysical experiments and analysis of log response characteristics,a method for evaluating the saturation of calcareous reservoirs is established.Firstly,based on the calcareous sandstone rock volume physical model,the porosity calculation model of the calcareous reservoir is derived.Secondly,through a series of petrophysical experiments such as casting thin section,X-ray diffraction and rock electricity experiment,a calcium content calculation model is established with normalized resistivity,acoustic time difference and porosity parameters.Finally,after clarifying the characteristics of the resistivity log response of the calcareous reservoir,the resistivity value is corrected for the effect of calcium and a variable parameter Archie model considering calcium content is established.The processing of logging data of tight sandstone reservoirs in Gongshanmiao reservoir in the Sichuan basin shows that the accuracy of oil saturation calculated by this method is significantly improved and the absolute error of calculation is less than 5%,which provides a new idea and method for the calculation of calcareous tight sandstone reservoir saturation.

关 键 词：测井评价 致密油 钙质含量 饱和度模型 四川盆地 凉高山组 

分 类 号：P631.84[天文地球—地质矿产勘探]