CAJ | 학술논문

通过分形理论利用毛管压力曲线分析页岩储层的孔隙分布特征，研究储层内部的复杂孔隙结构。根据四川盆地上三叠统页岩储层样品的实测毛管压力曲线，结合前人的研究成果，总结出2类页岩储层毛管压力曲线；分段拟合计算分形维数后，发现压汞曲线只有部分段的分形维数在合理范围内。说明利用分形维数研究页岩储层孔径分布时，要对曲线进行分段拟合。此外，证明了毛管压力曲线能够反映孔径＞150 nm的中孔的孔隙半径分布。
통과분형이론이용모관압력곡선분석혈암저층적공극분포특정，연구저층내부적복잡공극결구。근거사천분지상삼첩통혈암저층양품적실측모관압력곡선，결합전인적연구성과，총결출2류혈암저층모관압력곡선；분단의합계산분형유수후，발현압홍곡선지유부분단적분형유수재합리범위내。설명이용분형유수연구혈암저층공경분포시，요대곡선진행분단의합。차외，증명료모관압력곡선능구반영공경＞150 nm적중공적공극반경분포。
Compared to the conventional reservoirs,the pore structure of shale reservoirs is more complex and heterogeneous.A new method is developed to analyze the capillary pressure curve in shale samples.In studying the mercury-injection curve of the shale samples from the Upper Triassic shale gas reservoir in the West Sichuan depression of China,the authors find that the mercury-injection curve can be divided into two classes,and they also demonstrate how to adopt polynomial segmentation fitting to calculate the fractal dimension.After the characteristic of each segment is analyzed,they find that only a short segment with reasonable fractal dimension can describe the real distribution of pores.This proves that the capillary pressure curve can only reflect the distribution of the pore whose radius is >150 nm.