中文摘要：

以宁武盆地太原组海陆过渡相页岩为研究对象,借助扫描电镜观察了页岩微观孔隙特征,采用核磁共振（NMR）技术和低温氮吸附实验相结合的方法深入研究了孔隙结构。结果表明：宁武盆地太原组海陆过渡相页岩主要发育有机质孔、矿物晶间孔、铸模孔和微裂隙四类孔隙;页岩样品T2谱特征相似,形态上表现为双峰,峰值分别介于0.8～1ms,20～50ms之间,根据左峰高低可划分为高峰T2谱和低峰T2谱两类,高峰T2谱样品成熟度偏低,有机碳含量较高,低峰T2谱样品成熟度高,有机碳含量低,表明有机碳含量和成熟度可能会影响孔隙的发育;低温氮吸附实验结果显示样品具有Ⅳ型等温吸附线,滞后环类型以H3型为主,部分兼有H2特征,反映孔隙主要为平行板状孔。FHH方程计算的页岩孔隙分形维数D值在2.66～2.71之间,数值接近3,表明页岩孔隙结构较为复杂,其非均质性较强,而微小孔发育是造成页岩孔隙结构非均质性的主要原因。

英文摘要：

Take transitional facies shale of Taiyuan Formation in Ningwu Basin as an object to deeply investigate the pore structure of transitional facies shale reservoir,by means of scanning electron microscopy（SEM）,nuclear magnetic resonance（NMR）technology and low-temperature nitrogen adsorption method.Results show pores in transitional facies shale reservoir can be classified into four types：organic pores,mineral intercrystalline pores,moldic pores and microfracture.T2 spectrum of samples are of similar features and have bimodal distribution at T2=0.8～1ms and T2= 20～50ms respectively.Moreover,T2 spectrum are divided into higher-altitude T2 spectrum and lower-altitude T2 spectrum according to value at left peak.It is noticeable that the former samples have higher maturity and lower organic carbon content,while the latter samples are converse,indicating maturity and organic carbon content may have a role in pore structure.Low-temperature N2 isotherm of samples are correspond to type Ⅳ and hysteresis loops are similar to type H3,partly type H2,reflecting the parallel plate-like pores.Shale fractal dimension D value calculated by FHH equation is between 2.66 and 2.71,which is close to 3,indicating that the shale pore structure is more complex,and of strong heterogeneity,which is mainly related to heterogeneity of micropores.