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孔隙和裂隙的微观结构是影响岩石声波速度、渗透率等物性参数的重要因素,这些物性参数是冻土区天然气水合物成藏规律研究和资源勘探的重要依据。针对青海聚乎更钻探区钻井岩心,采用微米级计算机断层扫描技术(微CT)对岩心内部的微观孔隙和裂隙进行了形态表征和定量分析。结果表明:泥岩样品中的裂隙较为丰富且连通性较好,裂隙宽度多为100~200μm;而砂岩样品中孔隙分布较为分散且少有显著的连通喉道,数量上以体积小于0.1 mm3的微孔隙为主;通过三维图像体素统计法估算了孔隙和裂隙相对整个岩心的体积含量,其中砂岩样品的孔(裂)隙度为2.36%~2.89%,泥岩样品的孔(裂)隙度为1.04%~3.64%。
The microstructure of pores and fissures is an important factor affecting the physical parameters such as acoustic velocity and permeability of rock. These physical parameters are the important basis for the study of accumulation of natural gas hydrate in the permafrost region and exploration of resources. Aiming at the drilling core in the drilling area of polygamy in Qinghai Province, micro-level computed tomography (micro-CT) was used to characterize and quantitatively analyze the microscopic pores and fractures in the core. The results show that the fractures in the mudstone samples are rich and well connected, and the width of the fractures is mostly between 100 and 200 μm. However, the pore distribution in the sandstone samples is rather scattered and there are few significant connected throats. The pore volume of sandstone samples was 2.36% -2.89%. The porosity of fractured mudstone samples was 1.04% ~ 3.64%.