【摘要】 论文为探究鄂尔多斯盆地G井区盒8段储层特征及影响储层微观孔喉复杂程度的因素。通过铸体薄片、扫描电镜、X全岩衍射实验和高压压汞等实验及分形理论,分析储层特征,并通过储层物性、孔喉特征参数及矿物成分等因素,探究各因素与孔喉复杂程度的关系。研究表明:研究区盒8段储层岩性为灰白色中—细砂岩,储集空间以粒间孔、溶蚀孔为主,喉道类型有缩颈、片状和弯片状喉道,为特低孔—超低孔的致密砂岩储层;储层分形维数多数大于2.5,非均质性较高,分形维数随储层物性变差而增大;分形维数与孔喉特征参数有较好的相关关系,孔喉特征对储层的储集性能和渗流能力有一定影响;分形维数与部分矿物之间具有相关性,矿物成分及其含量是决定孔喉复杂程度的内在因素,影响着储层的质量和物性特征。更多还原

【Abstract】 In order to explore the reservoir characteristics of He 8 of G Well block in Ordos Basin and the factors affecting the complexity of microscopic pore-throat. Reservoir characteristics were analyzed by casting thin section, scanning electron microscope, X-whole rock diffraction experiment and high-pressure mercury injection, and the relationship between various factors and pore-throat complexity was explored through reservoir physical properties, pore-throat characteristic parameters and mineral composition. The results show that the reservoir lithology of He-8 member in the study area is gray-white medium-fine sandstone,and the reservoir space is mainly intergranular pores and dissolution pores. The throat types are neck-constricted, flaky and bent flaky, and it is a tight sandstone reservoir with ultra-low porosity and ultra-low porosity. The fractal dimension of most reservoirs is greater than 2. 5, and the heterogeneity is high. The fractal dimension increases with the deterioration of reservoir physical properties. There is a good correlation between fractal dimension and pore-throat characteristic parameters. Pore-throat characteristics have a certain influence on reservoir performance and seepage capacity. The fractal dimension is correlated with some minerals, and the mineral composition and content are internal factors that determine the complexity of pore-throat, and affect the reservoir quality and physical characteristics.更多还原