基于Thomeer函数的中东区块碳酸盐岩储层渗透率评价  

Evaluation of carbonate reservoir permeability in Middle East Block based on Thomeer function

作　　者：张冲[1,2] 汤潇 倪国辉 闵云艺 张亚男[1,2] ZHANG Chong;TANG Xiao;NI Guohui;MIN Yunyi;ZHANG Ya’nan(Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education,Yangtze University,Wuhan 430100,Hubei;College of Geophysics and Petroleum Resource,Yangtze University,Wuhan 430100,Hubei;Great Wall Drilling Company,CNPC,Beijing 100101;Yangtze University Library,Wuhan 430100,Hubei)

机构地区：[1]油气资源与勘探技术教育部重点实验室(长江大学),湖北武汉430100 [2]长江大学地球物理与石油资源学院,湖北武汉430100 [3]中国石油集团长城钻探工程公司,北京100101 [4]长江大学图书馆,湖北武汉430100

出　　处：《长江大学学报（自然科学版）》2021年第1期43-51,共9页Journal of Yangtze University(Natural Science Edition)

基　　金：国家自然科学基金项目“致密气储层岩石导电机理研究及饱和度评价”(41404084);湖北省自然科学基金项目“基于等效岩石单元模型的渗透率测井评价方法研究”(2013CFB396)。

摘　　要：以中东区块H油田Mishrif层组碳酸盐岩压汞资料为基础,提出了一种基于Thomeer函数的渗透率模型。首先,利用变步长的牛顿阻尼迭代算法进行了Thomeer函数拟合,提取了压汞孔喉分布曲线为单峰、双峰及三峰的Thomeer参数(孔隙几何因子G、起始排驱压力pd和毛细管压力无穷大时对应的进汞体积分数VHg);其次,根据累计渗透率贡献公式,分析了双峰和三峰形态的压汞资料中每个孔喉体系单元对渗透率的贡献(无论是双峰还是三峰,对岩样渗透率起主要贡献的是孔喉半径区间最大的孔喉体系单元);最后,依据279块岩样(单峰249块,双峰11块,三峰19块)压汞数据,建立了渗透率与从孔喉半径区间最大的孔喉体系单元中提取的Thomeer参数的响应模型。该模型应用于中东区块H油田碳酸盐岩渗透率的计算,其精度明显优于Winland R35模型、Swanson模型及Capillary-Parachor模型。On the basis of mercury injection data of carbonate rocks of Mishrif Formation in H oilfield in the Middle East Block,a permeability model based on Thomeer function was proposed.Firstly,Thomeer function fitting was performed by using variable-step Newton damping iterative algorithm,and Thomeer parameters with unimodal,bimodal and triple peaks of the distribution curve of mercury injection pore throat were extracted,including pore geometry factor G,initial displacement pressure p d and mercury injection volume V Hg at infinite capillary pressure.Secondly,according to the cumulative permeability contribution formula,the contribution of each pore-throat system unit to the permeability in the mercury injection data of bimodal and triple peak morphology was analyzed.The research results show that whether it is bimodal or three peaks,the main contribution to the permeability of rock samples is the pore-throat system unit with the largest pore-throat radius interval.Finally,based on the mercury injection capillary pressure data of 279 rock samples(249 unimodal rock samples,11bimodal rock samples,19 three-peak rock samples),the response model of permeability and Thomeer parameter values extracted from the pore throat system unit with the largest pore throat radius interval was established.The model has been applied to the calculation of carbonate rock permeability of H oil field in the Middle East Block,and its accuracy is significantly better than the Winland R35 model,Swanson model and Capillary-Parachor model.

关 键 词：Thomeer函数 牛顿阻尼迭代算法 压汞毛细管压力曲线 渗透率模型 中东区块碳酸盐岩 

分 类 号：P631.84[天文地球—地质矿产勘探]