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根据鄂尔多斯盆地苏里格气田西区苏48区块盒8段—山1段储集砂岩的岩石薄片、铸体薄片、扫描电镜、X-射线衍射、高压压汞及核磁共振等测试分析数据,精细表征了盒8段—山1段储层微观特征。研究表明:砂岩类型以岩屑石英砂岩、石英砂岩为主,盒8段储层孔隙类型以粒间孔、岩屑溶孔和晶间孔为主,盒8下亚段孔喉半径较大,喉道发育程度较好,其有效孔隙个数和体积均高于其他储层。山1段孔隙类型主要有岩屑溶孔、晶间孔、凝灰质溶孔以及长石溶孔,山1段孔喉半径较小。盒8段—山1段喉道类型主要有管束状喉道、片状喉道和点状喉道,分选性均为中等—差,排驱压力相差不大。通过高压压汞和核磁共振提供的喉道半径以及可动流体饱和度的精细表征结果,将研究区储层划分为4类,明确储层差异的原因是受到碎屑成分、孔隙类型、结构及非均质性的共同影响。
According to the test data of rock slices, cast thin sections, scanning electron microscopy, X-ray diffraction, high pressure mercury intrusion and nuclear magnetic resonance of reservoir sandstone in Block 8-Shan 1 of Block Su 48 in the western section of the Su Lige gas field in the Ordos Basin, The microfacies of Block 8 - Shan 1 are characterized. The results show that the sandstone is dominated by lithic quartz sandstone and quartz sandstone. The pore types of the 8th reservoir are mainly intergranular pores, lithic dissolved pores and intercrystalline pores, Throat development is better, the effective number of pores and volume are higher than other reservoirs. The major pore types of Shan 1 include lithic solution pores, intergranular pores, tuff dissolved pores and feldspar dissolved pores. Box 8 - Shan 1 throat types are mainly bundle-like throat, lamellar throat and point-like throat, sorting are moderate - poor, drainage pressure is not much difference. Based on the detailed characterization of throat radius and movable fluid saturation provided by high pressure mercury intrusion and nuclear magnetic resonance, the reservoirs in the study area are divided into four categories. The reason for the clear reservoir difference is that the composition, pore type, structure and The common influence of heterogeneity.