低渗火山岩气藏渗吸机理实验研究  

Experimental Study of Imbibition Mechanism in Low Permeability Volcanic Gas Reservoir

作　　者：刘先山 孙军昌 郭和坤[3] 王皆明 李春[1,2] 朱思南 LIU Xianshan;SUN Junchang;GUO Hekun;WANG Jieming;LI Chun;ZHU Sinan(Research Center of Underground Gas Storage,PetroChina Exploration & Development Research Institute,Langfang,Hebei 065007,China;Key Laboratory of Underground Oil & Gas Storage,CNPC,Langfang,Hebei 065007,China;Research Institute of Enhanced Oil Recovery,PetroChina Exploration & Development Research Institute,Langfang,Hebei 065007,China)

机构地区：[1]中国石油勘探开发研究院地下储库研究中心,河北廊坊065007 [2]中国石油天然气集团公司油气地下储库工程重点实验室,河北廊坊065007 [3]中国石油勘探开发研究院提高采收率研究所,河北廊坊065007

出　　处：《西安石油大学学报（自然科学版）》2021年第1期45-51,91,共8页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家重点研发计划“国家石油天然气国家储备库致灾机理和安全影响评价”(2017YFC0805801)。

摘　　要：为深入研究喷发成岩的强非均质性火山岩气藏渗吸机理,综合使用气水驱替、核磁共振、X-CT成像等实验进行分析。结果表明,火山岩实验样品自发渗吸含水饱和度增加主要发生在渗吸初期的2 h,渗吸24 h已基本达到稳定状态,储层渗透率越小渗吸水饱和度越大。自发渗吸过程中微小孔隙渗吸速度和渗吸水分布比例均大于较大孔隙,约有80%的渗吸水分布在微小孔隙,残余气主要分布在较大孔隙中。而动态渗吸过程中较大孔隙渗吸速度和渗吸水分布比例均大于微小孔隙。复杂火山岩气藏自发与动态渗吸残余气饱和度分别为18.51%和6.55%,渗吸效率分别为48.62%和80.25%,渗透率越小,渗吸效率越高,但残余气饱和度与孔隙度之间不存在明显的对应关系。To further study the reservoir imbibition mechanism of strongly heterogeneous volcanic rocks with eruptive diagenesis,the imbibition mechanism of low permeability volcanic gas reservoir is systematically studied by gas-water displacement,nuclear magnetic resonance and X-CT imaging technique.The results show that the increase of spontaneous imbibition water saturation of volcanic rock experimental samples mainly occurs in the initial 2 hours of imbibition,and the imbibition has basically reached a stable state in 24 hours.The smaller the reservoir permeability is,the greater the imbibition water saturation is.In the process of spontaneous imbibition,the imbibition rate and imbibition water in micro pores are larger than those in large pores,about 80%of imbibition water is distributed in micro pores,and the residual gas is mainly distributed in large pores.In the process of dynamic imbibition,the imbibition rate and imbibition water in large pores are larger than those in micro pores.The residual gas saturation of complex volcanic gas reservoirs in spontaneous and dynamic imbibition processes are 18.51%and 6.55%respectively,and the imbibition efficiency is 48.62%and 80.25%respectively.The smaller the permeability is,the higher the imbibition efficiency is.However,there is no obvious corresponding relationship between residual gas saturation and porosity.

关 键 词：低渗火山岩气藏 自发渗吸 动态渗吸 核磁共振 孔隙结构 残余气饱和度 

分 类 号：TE311[石油与天然气工程—油气田开发工程]