CAJ | 학술논문

针对传统方法难以定量描述煤岩储层非均质性的问题，提出了一种新的适用于煤岩的毛管压力模型，来评价煤岩储层的非均质性。该模型基于分形理论，引入孔隙分布指数，并考虑迂曲度参数的影响，通过恒速压汞法测量某煤矿的煤岩岩心的孔隙度、渗透率，得到毛管压力曲线，对毛管压力曲线进行拟合得到分形维数；利用孔隙大小分布曲线，分析并验证计算得到的分形维数，与其他几种常用的计算分形维数的方法相比，该方法更精确可靠。最后定量分析分形维数与非均质性的关系及分形维数与煤岩的孔隙喉道，以及孔隙度和渗透率的关系，结果表明，该方法可以定量评价煤岩储层的非均质性。
침대전통방법난이정량묘술매암저층비균질성적문제，제출료일충신적괄용우매암적모관압력모형，래평개매암저층적비균질성。해모형기우분형이론，인입공극분포지수，병고필우곡도삼수적영향，통과항속압홍법측량모매광적매암암심적공극도、삼투솔，득도모관압력곡선，대모관압력곡선진행의합득도분형유수；이용공극대소분포곡선，분석병험증계산득도적분형유수，여기타궤충상용적계산분형유수적방법상비，해방법경정학가고。최후정량분석분형유수여비균질성적관계급분형유수여매암적공극후도，이급공극도화삼투솔적관계，결과표명，해방법가이정량평개매암저층적비균질성。
Traditional methods have difficulties in quantifying the heterogeneity of coal deposits.Therefore,a new capillary pres-sure model is proposed to evaluate the heterogeneity of coal reservoir.Based on fractal geometry,the model introduces pore size distribution index and considers the impact of tortuosity parameter.Capillary pressure curve is determined by porosity and perme-ability of drill cores from certain coal mine,which were measured by constant-rate mercury penetration technique.Fractal dimen-sion was obtained by fitting capillary pressure curve.In comparison with results of conventional methods,results of fractal di-mension can be testified by analyzing the pore volumetric percent curves,and thus are more accurate.Finally,relationships be-tween fractal dimension and heterogeneity,and relationships between fractal dimension and pore diameter,as well as relationships between porosity and permeability,were analyzed quantitatively.The new method is applicable in quantifying the heterogeneity of coal deposits.