含水火山岩气藏气体非线性渗流机理研究  

Mechanism of Non-liner Gas Seepage Flow in Water-Bearing Volcanic Gas Reservoir

作　　者：杨正明[1,2,3] 霍凌静[1,2] 张亚蒲[1,2] 王学武[1,2] 单文文[1,2] 

机构地区：[1]中国石油勘探开发研究院廊坊分院 [2]中国石油科学技术研究院渗流流体力学研究所,河北廊坊065007 [3]武汉工业学院,湖北武汉430016

出　　处：《天然气地球科学》2010年第3期371-374,共4页Natural Gas Geoscience

基　　金：国家重点基础研究发展规划("973")项目(编号:2007CB209500);国家自然科学基金(编号:10672187)联合资助

摘　　要：火山岩气藏已成为我国天然气勘探和开发的重要领域之一,目前在松辽盆地、准噶尔盆地及渤海湾盆地等都有所新发现,火山岩气藏资源量已超过3×1012m3,是当前天然气勘探和开发中所关注的热点问题之一。利用物理模拟和核磁共振实验技术,研究和分析了在不同含水饱和度下气体渗流曲线的特征和可动气饱和度的变化规律。研究表明:含水火山岩岩心气体渗流时,若以流量和压力梯度作为描述气体渗流曲线的坐标轴,其曲线特征为凹形曲线至直线,其克氏曲线大致以临界含水饱和度为界限分为2种渗流形态。对于同一块岩心来说,当含水饱和度低于临界含水饱和度时,气体不存在启动压力梯度;只有当含水饱和度大于临界含水饱和度时,气体才存在启动压力梯度,含水饱和度越高,启动压力梯度越大,可动气饱和度越低。此外,还分析了水在喉道中的赋存状况。Volcanic gas reservoir has become one of the main fields of gas prospecting and development in China.Recently,the volcanic gas reservoir has exceeded 3,000 billion m3 in the basins of Songliao,Zhunger and Bohai bay.We discussed the gas seepage characteristic with different water saturations and the variation of movable gas saturation by means of physics simulation and nuclear magnetic resonance experiment.The result indicates that the relation curves between seepage discharge of volcanic gas reservoir rock and pressure gradient would be concave to line,and the Klinkenberg curve be divided into two seepage states by the critical water saturation.When the water saturation is lower than the critical water saturation,there is no gas start-up pressure gradient;and when the water saturation is higher than the critical water saturation,the start-up pressure gradient of gas exist.The higher the water saturation is,the bigger the start-up pressure gradient is,and the lower the movable gas saturation is.We also discuss the occurrence state of water in pores.

关 键 词：火山岩气藏 核磁共振 含水饱和度 可动气 渗流 非线性 

分 类 号：TE311[石油与天然气工程—油气田开发工程]