• 论文
主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
黔西地区煤样孔隙综合分形特征及对孔渗性的影响
  • Title

    Pore integrated fractal characteristics of coal sample in western Guizhou and its impact to porosity and permeability

  • 作者

    高为易同生金军杨通保赵凌云王冉周效志

  • Author

    GAO Wei1,2 ,YI Tong-sheng1 ,JIN Jun1 ,YANG Tong-bao1 ,ZHAO Ling-yun1 ,WANG Ran3 ,ZHOU Xiao-zhi3

  • 单位

    贵州省煤层气页岩气工程技术研究中心贵州省煤田地质局159队中国矿业大学资源与地球科学学院

  • Organization
    1. Guizhou Engineering Technology Research Center for Coalbed Methane and Shale Gas,Guiyang  550008,China; 2. No. 159 Team of Guizhou Coal Geolog-ical Bureau,Panxian  561600,China; 3. School of Resource and Earth Science,China University of Mining & Technology,Xuzhou  221116,China
  • 摘要
    为了定量描述煤储层孔隙结构的复杂程度,基于压汞试验测试结果,运用分形理论,对黔西地区不同煤阶的32个煤样进行了分形特征研究,并探讨了分形几何参数与煤储层孔渗性的关系。结果表明:煤储层孔隙分形维数可分为渗流分形维数和扩散分形维数,利用不同分形段的孔隙体积比作为权值,通过加权求和方法可得到综合分形维数;渗流分形维数随变质程度增加而减小,扩散分形维数和综合分形维数均随变质程度增加而增大;分形界限、扩散孔隙体积分数及总孔体积都与综合分形维数、扩散分形维数具有较好的相关性,而且3个指标参数与综合分形维数的相关系数均高于与扩散分形维数的相关系数;综合分形维数、分形界限及扩散孔隙体积分数与煤储层孔隙度之间为负幂指数相关关系,总孔体积与煤储层孔隙度为线性正相关关系,与渗流分形维数和扩散分形维数相比,综合分形维数更有利于表征煤储层渗透性。
  • Abstract
    Based on a mercury injection test and fractal theory,a total of 32 coal samples from western Guizhou with different ranks were studied on their fractal characteristics in order to quantitatively describe the complexity of pore structure. The relationship between fractal geometry parameters,porosity and permeability of coal reservoir was also discussed. The result shows that the pore fractal dimension in this area could be divided into penetration fractal dimen- sion and proliferation fractal dimension. In addition,by using the pore volume ration as weights and the fractal dimen- sion of each diameter section weighted sum,the integrated fractal dimension could be calculated. At the same time,the penetration fractal dimension decreased with the increase of coal seam metamorphism,while the proliferation fractal di- mension and integrated fractal dimension increased with the increase of coal seam metamorphism. The fractal bounda- ry,proliferation pore volume fraction and total pore volume had a good correlation with the integrated fractal dimension and proliferation fractal dimension. Moreover,the correlation coefficient between integrated fractal dimension and anterior three parameters was higher than that proliferation fractal dimension and three parameters. The integrated fractal dimension,fractal boundary and proliferation pore volume fraction had a negative power exponent relationship with po- rosity,while a clear linear positive relationship was shown between total pore volume and porosity. Compared with pen- etration fractal dimension and proliferation fractal dimension,the integrated fractal dimension is more effective to ex- plain coal reservoir permeability.
  • 关键词

    黔西地区煤储层压汞试验分形维数孔隙度渗透率

  • KeyWords

    western Guizhou;coal reservoir;mercury injection experiment;fractal dimension;porosity;permeability

  • 基金项目(Foundation)
    国家科技重大专项资助项目(2016ZX05044001-005);贵州省科技重大专项资助项目(黔科合重大专项字[2014]6002号);中国地质调查局资助项目(12120114020201-05);
  • DOI
  • Citation
    Gao Wei,Yi Tongsheng,Jin Jun,et al. Pore integrated fractal characteristics of coal sample in western Guizhou and its impact to porosity and permeability[J]. Journal of China Coal Society,2017,42(5):1258-1265.
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