靖边气田北部上古生界储层微观孔隙结构及其对生产动态影响  

Micro-pore Structure Characteristics and Its Influence on Gas Well Production Performance in the Northern Part of Sandstone Reservoir in Jingbian Gasfield

作　　者：魏虎[1,2] 孙卫[1,2] 屈乐 晏宁平 吕建 

机构地区：[1]西北大学大陆动力学国家重点实验室,西安710069 [2]西北大学地质学系,西安710069 [3]中国石油测井有限公司,西安710077 [4]中国石油股份有限公司长庆油田分公司第一采气厂,陕西靖边718500

出　　处：《地质科技情报》2011年第2期85-90,共6页Geological Science and Technology Information

基　　金：国家科技支撑计划项目(2007BA17B00)

摘　　要：靖边气田北部盒8、山1段砂岩气藏气井投产存在井筒积液、稳产时间短等问题。通过扫描电镜、铸体薄片、常规压汞等技术对储层岩样进行了测试分析,研究了岩石学特征和孔隙类型。将其微观孔隙结构分为4类并研究了微观孔隙结构特征和气井生产动态的关系。研究表明,盒8、山1段储层的孔隙类型主要为溶孔、晶间微孔,孔隙组合类型主要为晶间微孔、溶孔-晶间微孔。微观孔隙结构特征对气井生产动态影响显著,主要体现在:渗透率随着平均孔喉半径增大而变大;孔喉分布影响气水分布和气水渗流特征,从而影响气井的生产特征;微观孔隙结构影响气井的生产方式,认为合理的生产压差、连续生产、排水采气措施是盒8、山1段气藏合理的生产方式。There are some problems in the gas wells of He-8 and Shan-1 sandstone reservoirs in the northern part of Jingbian Gasfield,such as wellbore liquid loading and short period of stabilized production.By means of the SEM,casting slice and high pressure mercury intrusion,the sandstone samples were tested to analyze the characteristics of petrology and pore types.Then the relationships between the characteristics of micro-pore structure and gas well performance are studied,in which micro-pore structure are divided into 4 categories.The research shows that the pores are predominated by dissolved pore and intercrystal micro-pore,and the main pore-throat types consist of intercrystal micro-pores and dissolved pore-intercrystal micro-pores,in He-8 and Shan-1 reservoirs.The history of gas wells are significantly influenced by pore structure in three aspects.The pore permeability increases with increase of the average pore throat radius.The pore-throat distribution affects the characteristics of gas-water flow through porous medium and gas-water distribution and thus influences gas well performances.As the micro-pore structure has a very important impact on well operating patterns,it is advisable that the correct techniques for gas recovery and water draining,continuous producing and low producing pressure drop should be suitable for He-8 and Shan-1 gas reservoirs.

关 键 词：微观孔隙结构 气井生产动态 平均孔喉半径 生产方式 靖边气田 

分 类 号：P618.130.21[天文地球—矿床学]