MOE Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process,China University of Mining Technology lnstitute of Resources & Environment,Henan Polytechnic University

为利用煤储层孔隙结构的分形维数来定量描述其复杂程度,基于压汞试验,对黔西比德-三塘盆地主采煤层10个煤样进行了分形特征研究,并阐明了分形维数与煤储层物性之间的关系。结果表明:煤储层的分形可分为煤基质颗粒间大孔隙分形、煤基质颗粒中过渡孔隙分形和煤基质颗粒中微、小孔隙分形;大孔和过渡孔分形维数较高,小孔和微孔分形维数较低,3种孔隙结构的复杂程度依次为过渡孔>大孔>小孔和微孔。不同尺度的孔隙分形维数与孔隙体积分数呈负相关关系;大孔和过渡孔的分形维数均随着煤的变质程度、镜质组含量、灰分的变化呈现高-低-高的变化规律,与惰质组含量呈现低-高-低的变化规律,与水分、退汞效率成正相关关系,与平均孔径、孔隙度成负相关关系;小孔和微孔的分形维数与煤的变质程度、镜质组含量呈现低-高-低的变化规律,与惰质组和灰分含量呈现高-低-高的变化规律,与水分和退汞效率成负相关关系,与平均孔径和孔隙度成正相关关系。

Based on mecury injection experiments a otal of 10 coal samples cllcted from main coal seams in Bide-santang Basin were studied on difrent scales n orer to qu antitatively descibe the complexityof pore stucture using the fractal dimension.The relationship between fractal dinension and physical properies ofcal reservoir was claified.The resut showed that factal of coal resevir in ths area could be divided into mac.opore fractal between coal matrix paricles ,ranstion pore fracal in cal matrix paricles.,and they had igher frctal dimension. The thrd kind was micropore and minipore fractal ncoal matix paricles,which was lower in fractal limension. Thecomplex degree of these three pore structures were ranstiton pore>macropore>micropore and minipore.The negative corelation was existed between pore fractaldinension and porcosity volume frction in difrent scaes.Mfacopore an transtion pore fractaldfimension showed hghlovw-high change rule with metamorphic grade irimite ash,whielow-highn-low change rule with inertnire he positive relationship with moisture and mercury withdra wal eficiency existec,while negativerelationshio with mean pore size and porosity .Micropore and minipore fracteal dinension showed low-high-ow change rue with metamophic grade and vitrinte wie hgh-ow-high change rule with inetinite and ash.The negaive relationship with moisture and mercury withdrawal eficsency exsted,whiepostive relationshio with meanpore size and porosity.

国家科技重大专项资助项目(2011ZX05034)；国家自然科学基金资助项目(41272178)；江苏省“青蓝工程”；江苏高校优势学科建设工程资助项目(PAPD)；