桑托斯盆地超临界CO2流体体积分数识别图版  

Identification Chart of Volume Fraction of Supercritical CO2 Fluid in Santos Basin

作　　者：侯秋元 黄亮 程晓钰 邵琨 李剑平 郑德壮 Hou Qiuyuan;Huang Liang;Cheng Xiaoyu;Shao Kun;Li Jianping;Zheng Dezhuang(International Division,CNPC Logging Co.Ltd.,Beijing 102200;Research Institute of Logging Technology,CNPC Logging Co.Ltd.,Beijing 102200)

机构地区：[1]中国石油集团测井有限公司国际事业部,北京102200 [2]中国石油集团测井有限公司测井技术研究院,北京102200

出　　处：《长江大学学报（自然科学版）》2020年第4期23-28,I0003,共7页Journal of Yangtze University(Natural Science Edition)

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“海外重点战略大区勘探技术研究与应用”(2019D-4309);“海外油气田工程技术集成配套与应用”(2019D-4509)。

摘　　要：巴西深海桑托斯盆地盐下储层岩性复杂,油气层中普遍存在不同体积分数的CO2,地层条件下CO2为超临界流体,其密度接近于液体,黏度接近于气体,这种特殊的流体性质导致利用测井方法识别油气层中CO2体积分数极其困难。在分析超临界CO2流体的物理性质与相态的基础上,研究了桑托斯盆地多个油田盐下CO2流体在地层温压条件下的测井响应特征,并应用标准化后的中子孔隙度密度孔隙度回归模型确定了桑托斯盆地超临界CO2流体体积分数识别图版。实际应用结果表明,该识别图版能够利用常规测井资料进行超临界CO2流体体积分数的半定量计算,与试油结果符合度较高,取得了较好的应用效果。The lithology of the subsalt reservoirs in Santos Basin in the deep offshore of Brazil is complex,and CO2 with different volume fractions is ubiquitous in hydrocarbon reservoirs.Under formation conditions,CO2 is a supercritical fluid with a density close to that of liquid and a viscosity close to that of gas.Such special fluid properties make it extremely difficult to identify the volume fraction of CO2 in oil and gas reservoirs by logging methods.Based on the analysis of the physical properties and phase behavior of supercritical CO2 fluid,the logging response characteristics of the subsalt CO2 fluid under formation temperature and pressure conditions in several oil fields in Santos Basin were studied,and the normalized neutron porosity-density porosity regression model was used to determine the identification chart of volume fraction of supercritical CO2 fluid in Santos Basin.The practical application results show that the identification chart can be used to semi-quantitative calculation of the volume fraction of supercritical CO2 fluid by using the conventional logging data,which are in good agreement with the oil test results and have obtained good application effect.

关 键 词：桑托斯盆地 超临界CO2流体 测井识别 中子孔隙度密度孔隙度回归模型 识别图版 

分 类 号：P631.84[天文地球—地质矿产勘探]