CAJ | 학술논문

为了探讨煤岩类型和煤储层孔隙结构的耦合关系，建立了煤层层内非均质模型，采用压汞、液氮、CT 等实验测试手段和分形数学理论，根据实验得到的各孔径段孔隙含量、视孔隙率、体积中值半径、退汞效率、BET 比表面积、BJH 总孔容、平均孔径等参数的均值来研究光亮煤、半亮煤、半暗煤和暗淡煤储层物性差异，结合 CT 三维空间建模，分析了不同煤岩类型煤储层孔隙结构特征与差异性。结果表明：光亮煤微裂隙发育，连通性好，有利于煤层气的解吸、扩散和渗流，为煤层气勘探开发的有利储层；半亮煤孔隙连通性好，较有利于煤层气解吸、扩散和渗流，同样为有利储层；半暗煤孔径分布较均衡，半封闭-开放孔发育，较有利于煤层气富集和渗流，为煤层气勘探开发的中等储层；暗淡煤微小孔含量最低，空间呈点状分布，矿物含量高，裂隙不发育，对于煤层气的渗流和储集均不利。原生结构煤为主的矿区煤层气开发应首选光亮煤发育带，其次为半亮煤和半暗煤发育带。该结论可为煤层气开采过程中层间非均质性提供指导依据。
위료탐토매암류형화매저층공극결구적우합관계，건립료매층층내비균질모형，채용압홍、액담、CT 등실험측시수단화분형수학이론，근거실험득도적각공경단공극함량、시공극솔、체적중치반경、퇴홍효솔、BET 비표면적、BJH 총공용、평균공경등삼수적균치래연구광량매、반량매、반암매화암담매저층물성차이，결합 CT 삼유공간건모，분석료불동매암류형매저층공극결구특정여차이성。결과표명：광량매미렬극발육，련통성호，유리우매층기적해흡、확산화삼류，위매층기감탐개발적유리저층；반량매공극련통성호，교유리우매층기해흡、확산화삼류，동양위유리저층；반암매공경분포교균형，반봉폐-개방공발육，교유리우매층기부집화삼류，위매층기감탐개발적중등저층；암담매미소공함량최저，공간정점상분포，광물함량고，렬극불발육，대우매층기적삼류화저집균불리。원생결구매위주적광구매층기개발응수선광량매발육대，기차위반량매화반암매발육대。해결론가위매층기개채과정중층간비균질성제공지도의거。
To study the coupling relationship between macro-lithotypeand pore structure of the coal and establish the heteroge-neousmodel within coal layers,the experimental testing methods (including mercury injection,liquid nitrogen,computed tomo-graphy (CT))and the fractal mathematical theory are used to analyze the differences of reservoir physical properties among bright,semibright,semidull and dull coal basedon the experimentally obtained mean parameters such as the aperture porosity content,apparent porosity,median radius,mercury withdrawal efficiency,BET specific surface,BJH total pore volume,and av-erage pore diameter in combination with three-dimensional (3D)space construction.The research reveals that fissures of the bright coal are most developed and well connected,which is favorable reservoir for coalbed methane (CBM)exploration and de-velopment.Good pore connectivity of the semibright coal makes it also favorable for CBM exploration and development.The homogeneous pore distribution of each stage and developed semi-open pore makes the semidull coal less conducive to CBM enrich-ment and seepage.In the dull coal,the lowest content of micro pores,scattering distribution in 3D space,high mineral content, and not developed fissures all make it unfavourable to the CBM reservoir accumulation and seepage.Therefore,in the primary coal and CBD development,the bright coal should be the first choice,and then the semibright and semidull coal developing zones, the dull coal is the worst.This conclusion can provide guidance for interlayer heterogeneity during CBM exploitation.