摘要
通过对具有不同产能的砂岩与砾岩储层的岩性、物性、孔隙结构和孔隙微观特征系统研究，结合试气成果建立了砂岩和砾岩孔隙度和渗透率与产能关系图版，并依此确定了具有储集和产出能力的储层的有效孔隙度和渗透率下限值。砂岩孔隙度下限为4．1％-5．5％，渗透率下限为0．06×10^-3μm^2。由于砾岩单层厚度大，微裂缝发育，排驱压力低，因此孔隙度下限仅为2．7％，渗透率下限为0．05×10^-3μm^2。进一步研究表明，气层和干层的主要孔隙类型、毛细管压力曲线特征、成岩特征及储层控制因素的不同导致储层的含气性不同；砂岩和砾岩由于在孔隙类型、排驱压力等储层微观特征方面具有较大差异，致使物性下限差别较大。
Based on the research on lithology, physical properties, pore structure, and pore microscopic features of sandstone and conglomerate reservoirs with different productivity, the porosity ＆ permeability versus productivity charts for sandstone and conglomerate have been established with the consideration of gas testing results. According to the research, the lower limits of effective porosity and permeability for reservoirs where oil can be accumulated and produced are determined. The lower limit of porosity for sandstone is 4. 1%-5.5%, and that of permeability is 0. 06 ×10^-3μm^2. The lower limit of porosity for conglomerate is only 2. 7%, and that of permeability is 0. 05×10^-3μm^2, because the single conglomerate layer is thick, the microfractures are vegetal and the expulsion pressure is low. Further study indicates that the difference of the main pore type, capillary pressure curve characteristics, diagenetic features and the dominant factors for reservoirs between the gas pay and dry formation results in the gas-bearing difference of reservoirs. Due to the great difference of microscopic features, such as pore type and expulsion pressure, between sandstone and conglomerate, the lower limits of physical properties vary greatly.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2007年第5期18-20,24,共4页
Petroleum Geology & Oilfield Development in Daqing
关键词
砂岩
砾岩
储层
微观特征
物性下限
产能
sandstone
conglomerate
reservoir
microscopic features
lower limit of physical properties
productivity
