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数字岩心建模及其准确性评价
引用本文:赵秀才,姚军.数字岩心建模及其准确性评价[J].西安石油大学学报(自然科学版),2007,22(2):16-20.
作者姓名:赵秀才  姚军
作者单位:中国石油大学(华东)石油工程学院,山东,东营,257061
摘    要:介绍了模拟退火算法构建数字岩心的方法,指出了该方法建模时存在的问题,并对算法进行了改进;引入格子Boltzmann方法,并用其对所建岩心的传导性进行了评价.研究表明:模拟退火算法所建数字岩心具有良好的各向同性,但因其渗透性过低而与真实岩心差异较大;通过在退火过程中适时清除孤立的岩石颗粒可进一步降低系统能量、优化孔隙空间、加快退火速度,最终建立的岩心具有良好的各向同性、孔隙连通性和渗透性;格子Boltzmann方法计算数字岩心的渗透率简便易行、结果准确,可对岩心是否各向同性和渗透性的好坏给出合理评判,因而可作为数字岩心建模准确性评价的重要标准.

关 键 词:数字岩心  模拟退火算法  格子Boltzmann方法  岩心传导性
文章编号:1673-064X(2007)02-0016-05
修稿时间:2006-11-20

Construction of digital core and evaluation of its quality
ZHAO Xiu-cai,YAO Jun.Construction of digital core and evaluation of its quality[J].Journal of Xian Shiyou University,2007,22(2):16-20.
Authors:ZHAO Xiu-cai  YAO Jun
Abstract:The method for constructing digital core using simulated annealing algorithm (SAA) is introduced.The disadvantages of the algorithm are pointed out and the improvement of it is presented.The conductivity of the digital core constructed by the improved algorithm is evaluated by lattice Boltzmann method (LBM).It is shown that,the constructed digital core has good isotropy,but there is the greater difference between it and real core due to its very low permeability.Removing the isolated rock particles in appropriate times in annealing process can further decrease system energy,optimize the size of pores and increase annealing speed,which makes the finally constructed digital core have good isotropy,pore connectivity and permeability.Computing the permeability of the digital core by using the lattice Boltzmann method can effectively evaluate the isotropy and permeability of the digital core and can be as an important standard for evaluating the rationality of digital core modeling.
Keywords:digital core  simulated annealing algorithm  lattice Boltzmann method  conductivity of core
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