中国材料进展
中國材料進展
중국재료진전
Materials China
2015年
10期
700-708
,共9页
川南%龙马溪组%页岩%分形维数%孔隙结构%氮气吸附法%FHH 模型
川南%龍馬溪組%頁巖%分形維數%孔隙結構%氮氣吸附法%FHH 模型
천남%룡마계조%혈암%분형유수%공극결구%담기흡부법%FHH 모형
Sichuan Basin%Longmaxi Formation%shale%pore structure%fractal dimension%nitrogen adsorption%FHH model
分形维数是多孔介质不规则程度的度量。对川南下志留统龙马溪组页岩的氮气吸附法测量结果分析，采用基于 FHH 模型的分形维数计算模型，得到龙马溪组页岩孔隙的分形维数。川南龙马溪组页岩具有明显的分形特征及较大的分形维数，分形维数变化范围在2．6005～2．648，平均为2．6252。页岩分形维数与页岩比表面积和孔容呈正相关，且页岩中的微孔对页岩分形维数有重要影响。有机质、石英和黏土矿物对页岩分形维数影响较大，长石和碳酸盐对页岩分形维数影响较小；页岩分形维数与有机碳含量和石英含量呈正相关，而与黏土矿物含量呈负相关，其中黏土矿物中伊利石和绿泥石对页岩孔隙结构影响不同。页岩分形维数越大，页岩孔隙结构越复杂或孔隙表面越粗糙，页岩的吸附气体能力越强，但页岩气的解吸、扩散及渗流变得越困难。
分形維數是多孔介質不規則程度的度量。對川南下誌留統龍馬溪組頁巖的氮氣吸附法測量結果分析，採用基于 FHH 模型的分形維數計算模型，得到龍馬溪組頁巖孔隙的分形維數。川南龍馬溪組頁巖具有明顯的分形特徵及較大的分形維數，分形維數變化範圍在2．6005～2．648，平均為2．6252。頁巖分形維數與頁巖比錶麵積和孔容呈正相關，且頁巖中的微孔對頁巖分形維數有重要影響。有機質、石英和黏土礦物對頁巖分形維數影響較大，長石和碳痠鹽對頁巖分形維數影響較小；頁巖分形維數與有機碳含量和石英含量呈正相關，而與黏土礦物含量呈負相關，其中黏土礦物中伊利石和綠泥石對頁巖孔隙結構影響不同。頁巖分形維數越大，頁巖孔隙結構越複雜或孔隙錶麵越粗糙，頁巖的吸附氣體能力越彊，但頁巖氣的解吸、擴散及滲流變得越睏難。
분형유수시다공개질불규칙정도적도량。대천남하지류통룡마계조혈암적담기흡부법측량결과분석，채용기우 FHH 모형적분형유수계산모형，득도룡마계조혈암공극적분형유수。천남룡마계조혈암구유명현적분형특정급교대적분형유수，분형유수변화범위재2．6005～2．648，평균위2．6252。혈암분형유수여혈암비표면적화공용정정상관，차혈암중적미공대혈암분형유수유중요영향。유궤질、석영화점토광물대혈암분형유수영향교대，장석화탄산염대혈암분형유수영향교소；혈암분형유수여유궤탄함량화석영함량정정상관，이여점토광물함량정부상관，기중점토광물중이리석화록니석대혈암공극결구영향불동。혈암분형유수월대，혈암공극결구월복잡혹공극표면월조조，혈암적흡부기체능력월강，단혈암기적해흡、확산급삼류변득월곤난。
The fractal dimension is a measure of the degree of irregular porous media.This paper calculates the fractal dimensions of the pore structure of the Lower Silurian Longmaxi Formation shale in the south of Sichuan Basin by using the fractal dimension computational model based on FHH model and analyzes the measured results of the pore structure by the nitrogen adsorption method.The result shows that the pore structure of Longmaxi Formation shale has typical fractal nature,the fractal dimensions of pore structures of the Longmaxi Formation shale are relatively big and the value of the fractal dimension is 2.3559~2.6577,with an average of 2.488.There is a positive correlation between the fractal dimension of the shale and the specific surface area,the pore volume.Especially, the micropores in the shale have a significant impact on the fractal dimension.The organic matter, quartz and clay minerals have an important influence on the fractal dimension,whereas the feldspars and carbonates have a little influence on the fractal dimension.The fractal dimensions have positive <br> relationships with the contents of total organic carbon and quartz,whereas there is a negative correlation between the fractal dimension and clay minerals contents,and the illite and chlorite have a different impact on the shale pore structure.The shale with a higher fractal dimension has a more complicated pore structure and a more irregular pore surface,and a higher adsorption capacity of the shale.However,the shale with a higher fractal dimension has lower capacity of desorption,diffusion and seepage of the shale gas.
