摘要
针对低渗透储层岩心的饱和难题,基于CO2置换吸附气的原理开发了低渗透储层岩心饱和方法和实验装置,通过饱水法孔隙度测量考察了该方法在26块低渗透储层岩心的应用效果。研究发现,该方法饱和后饱水法孔隙度比常规饱和方法饱和后的饱水法孔隙度平均增加0.54%,平均比氦气法孔隙度小0.14%左右,饱和效果有明显改善并近于完全饱和;饱水法孔隙度相对增量与泥质含量存在正相关关系,而与平均粒径、孔隙度、渗透率存在负相关关系,表明该方法在消除致密岩心吸附气对饱和影响方面有很好的针对性,可用于低渗透储层岩心的饱和。
In order to improve the saturation of lowpermeability reservoir core, the saturation method and experimental device were developed based on CO2 displacement of absorbed gas. The saturation effect was investigated by the measurement of saturated porosity with the employment of 26 cores from lowpermeability reservoirs. It was demonstrated that saturation effect was significantly improved and was close to complete saturation because the saturated porosity of the new saturation method was 0. 54% on average larger than that of the traditional saturation method and 0.14% on average smaller than helium porosity. Also, it was illustrated that the new saturation method had highly pertinence in reducing the effect of absorbed gas in tight cores and was able to be widely used for the saturation of lowpermeability reservoir cores because the relative increment of saturated porosity by the new method increased positively with shale content and negatively with average grain size, helium porosity and permeability.
出处
《石油实验地质》
CAS
CSCD
北大核心
2014年第6期787-791,共5页
Petroleum Geology & Experiment
基金
国家油气专项(2011ZX05009-003)资助
关键词
CO2置换
低渗透储层
岩心饱和
吸附气
平均粒径
氦孔隙度
泥质含量
CO2 displacement
low-permeability reservoir
core saturation
absorbed gas
average grain size
helium porosity
shale content
作者简介
韩学辉（1974-），男，博士，副教授，从事储层岩石物理研究。E-mail：hxhlogging@yahoo．com．cn。
