应用微CT技术研究砂砾岩孔隙结构特征——以玛湖凹陷百口泉组储集层为例

以玛湖凹陷百口泉组砂砾岩储集层为研究对象，利用微CT技术，研究了砂砾岩储集层岩石的二维孔隙结构和三维孔隙结构特征。研究结果表明：玛湖凹陷百口泉组砂砾岩样品以残余粒间孔、溶蚀孔和微裂缝为主；孔隙形状不规则、孔喉大小不一，孔喉分布状态主要为连片状和孤立状；孔隙分布具有微观非均质性，在物性较差的样品中表现更明显；等效孔隙半径分布主要呈单峰分布，且等效孔隙半径主要小于50 μm，物性差的样品中小孔所占比例高于物性好的样品。

Using Micro-CT Scanning Technology to Study Characteristics of Pore Structures in Sandy Conglomerate: A Case from Baikouquan Formation in Mahu Sag,Junggar Basin

Taking the sandy conglomerate reservoir of Baikouquan formation in Mahu sag as the study objects, micro-CT scanning technology is used to investigate the characteristics of the 2D and 3D pore structures of the rock in the sandy conglomerate reservoir. The results indicated that the sandy conglomerate sample obtained from Baikouquan formation in Mahu sag is dominated by residual intergranular pores, dissolved pores and micro-cracks. The shapes of the pores are irregular, the pore throats are of different sizes and their distributions are mainly contiguous and isolated; microscopic heterogeneous pore distribution is noted and even obvious in the samples with poor physical properties; equivalent pore radius is mainly in unimodal distribution and mostly less than 50 μm, and the proportion of small pores in the samples with relatively poor physical properties is higher than that in the samples with good physical properties