基于毛管压力曲线分析的岩心麻皮系数计算——以鸭儿峡油田白垩系为例  

Calculation of core hempskin coefficient based on capillary pressure curve analysis:A case study of Cretaceous in the Yaerxia oilfield

作　　者：李国利 吴伟 杜文博 曾利刚 牟明洋 魏浩元 赵燕红 LI Guoli;WU Wei;DU Wenbo;ZENG Ligang;MU Mingyang;WEI Haoyuan;ZHAO Yanhong(Research Institute of Logging Application of CNPC Logging Co.,Ltd.,Xi'an 710000,Shaanxi,China;Yumen Oilfield Company Exploration Development Research Institute,Jiuquan 735000,Gansu,China)

机构地区：[1]中国石油集团测井有限公司测井应用研究院,陕西西安710000 [2]玉门油田公司勘探开发研究院,甘肃酒泉735000

出　　处：《河南理工大学学报（自然科学版）》2020年第4期38-44,共7页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(41372103);中国石油天然气股份公司重大专项(2018D-0704)。

摘　　要：麻皮效应造成实验室压汞法测量毛管压力时汞的注入量额外增加,从而导致计算出的岩心含油饱和度偏大,偏大的量与麻皮系数有关。为了分析麻皮效应对鸭儿峡油田白垩系砂砾岩油藏取心分析含油饱和度的影响,对麻皮效应产生的根源作了阐述,分析麻皮系数的计算,给出鸭儿峡油田白垩系砂砾岩油藏岩心的麻皮系数。依据该系数,对岩心含油饱和度进行校正;对校正前后的饱和度参数与阿尔奇公式计算的理论值进行了对比;同时,对校正后的饱和度与试油结论进行定性对比。结果表明:经麻皮系数校正后的岩心测量含油饱和度较岩心视含油饱和度低15%左右,与测井计算的饱和度吻合较好。可见该方法在一定程度上可为研究区岩心基础资料研究提供技术参考,可为油藏饱和度评价及资源量计算提供可靠数据。The hempskin effect results in an additional increase core in injection amount of mercury during the laboratory mercury injection measurement,which leads to a large oil saturation in the calculation which is related to the hemp coefficient.In order to analyze the influence of hemp skin effect on oil saturation in core analysis of Cretaceous glutenite reservoir in Yaerxia oilfield,the origin of hemp skin effect was expounded,the compute method of hempskin coefficient was analyzed and the results were given.According to this coefficient,the oil saturation of core was corrected,the saturation parameters before and after correction were compared with the theoretical values calculated by Archie formula,and the saturation after correction was qualitatively compared with the oil test conclusion.The results showed that the measured oil saturation of the core corrected by the hempskin coefficient was about 15%lower than the apparent oil saturation of the core,which was in good agreement with the saturation calculated by well logging.It could be seen that this method could provide technical reference for the study of core basic data in the research area to a certain extent,and provided reliable data for reservoir saturation evaluation and resource calculation.

关 键 词：毛管压力曲线 压汞试验 麻皮效应 饱和度 麻皮系数 鸭儿峡油田 白垩系 

分 类 号：TE19[石油与天然气工程—油气勘探]