基于恒速压汞法的低渗透储层分形研究  

Fractal study of low permeability reservoir based on constant-rate mercury injection

作　　者：时宇[1,2] 齐亚东[1] 杨正明[2] 黄延章[1] 

机构地区：[1]中国科学院渗流流体力学研究所,河北廊坊065007 [2]中国石油勘探开发研究院廊坊分院,河北廊坊065007

出　　处：《油气地质与采收率》2009年第2期88-90,共3页Petroleum Geology and Recovery Efficiency

基　　金：中国石油天然气股份有限公司重点科技攻关项目"特低渗透储层评价方法;标准及渗流机理研究"(06-02A-02-01)

摘　　要：由于实验手段的限制,常规的孔隙分形结构研究无法得到储层孔道和喉道数量,影响了研究的可靠性。根据恒速压汞所提供的低渗透储层孔喉数量参数,分析了孔道和喉道的分布规律,推导了用分形维数表征的单个喉道渗透率贡献率、平均喉道半径以及微观均质系数公式。研究结果表明,储层中孔道与喉道分布分属2个不同的体系,其中喉道分布符合分形结构,而孔道不符合。喉道分布的分形维数与渗透率相关性较差。绝大部分低渗透储层喉道分形维数越大,储层非均质性越强,开发难度越大。Because of the limit of experiment method,general research of pore fractal structure couldn't directly obtain the number of pores and throats.So,the result reliability was weakened.According to the pore throat number parameter of constant-rate mercury injection in low permeability reservoir,the distribution character of pores and throats was analyzed.And the fractal dimension formulas of single throat contribution for the permeability,average throat radius and microscopic uniformity coefficient were established. Result shows that throat distribution followed fractural structure,and pore didn't.Relation between fractal dimension of the throat and permeability is weak.For most of low permeability reservoirs,the bigger fractal dimension would result in more serious heterogeneity and more difficulty for development.

关 键 词：恒速压汞 分形 低渗透储层 孔喉特征 

分 类 号：TE125.3[石油与天然气工程—油气勘探]