中文摘要：

以辽河拗陷东部凸起海陆过渡相石炭系太原组为例，观察、描述太原组岩芯并系统采集佟2905井样品及辽宁省盘锦市小市泉山煤矿样品。通过XRD衍射、高压压汞、低温液氮吸附、场发射扫描电镜等实验手段，全面刻画了海陆过渡相页岩孔隙发育形态和孔隙结构特征。压汞实验结果显示，页岩孔径呈双峰分布，双峰分布在10100nm与10000100000nm，其中孔径小于100nm孔占主体。低温液氮吸附实验弥补了压汞实验在表征页岩小孔隙上的不足，对100nm以下的孔隙进行了更为精细的划分，实验结果表明，中孔（1050nm）提供了主要的孔体积，占总孔体积的33.48%43.96%。比表面积的分布与孔径大小呈负相关，极小孔（<2nm）和小孔（210nm）为比表面积的主要贡献者，提供的比表面积占整个比表面积的82.92%91.58%，均值为87.36%。单因素分析结果表明，页岩的比表面积主要受控于黏土含量，其相关系数为0.901，有机质影响不明显。孔隙以四面开放的平行板状孔和狭缝状孔为主，这种开放纳米孔可提高页岩气解吸效率和储层渗透率，提高页岩气产量。

英文摘要：

This paper uses the Taiyuan Formation in the Eastern Uplift of the Liaohe Depression as an example to study transitionalshale reservoir structures.Cores from well T2905were observed and described,and samples systematically collected.XRD,high pressure mercury injection,nitrogen adsorption,and field emission scanning electronic microscope(FESEM)methodswere adopted for analysis of pore characteristics including pore size,pore shape,and pore structure.Data from high pressuremercury injection showed a bimodal pore size distribution with a higher peak in the10–100nm range and a lower peak in the10000–100000nm range.Nitrogen adsorption can provide information on much smaller pores,so can help to precisely partitionpores under100nm.Results from nitrogen adsorption indicated that mesopores(10–50nm)provided the largest pore volume,accounting for33.48%–43.96%.According to BET analysis,smaller pores provide less specific surface area.Extremely smallpores(<2nm)and micro-pores(2–10nm)were the major contributors to specific surface area,accounting for82.92%–91.58%,with an average87.36%.The results from single factor analysis demonstrate that the specific surface area is not controlledby organic matter content but by clay mineral content,and the coefficient index is0.901.The hysteresis loop from nitrogenadsorption and desorption can be used to determine pore shape;parallel-plated pores and slit-shaped pores were the main typesidentified.Such open nano-pores can improve shale gas desorbing efficiency and reservoir permeability,and enhance shale gasproduction.