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目前,天然气水合物物性认识和资源评价研究都受到了天然岩心来源的极大限制。因此,开发出一套贴近于水合物地层的人造岩心技术特别是基础骨架制备思路显得尤为必要。从实际水合物地层特性出发,选取地质资料丰富、水合物成藏条件良好的美国阿拉斯加北部斜坡冻土区Mount Elbert Unit C-GH1井段地层作为模拟对象,选用石英砂环氧树脂压制胶结岩心方法,通过全面实验分析了影响人造岩心渗透率的主要因素,然后以渗透率和孔隙度为实验指标设计正交实验研究各因素对指标的影响,确定了与目标地层渗透率和孔隙度最为接近的2个配方,并通过力学单轴抗压强度值的比较进一步明确了较优配方。实验研究结果表明,设计的较优配方与目标地层的粒径配比、渗透率、单轴抗压强度和密度基本相同,孔隙度则较为接近,采用这种技术流程可以制备出贴近原位的水合物沉积物骨架。
At present, natural gas hydrate physical understanding and resource evaluation research have been greatly limited by the source of natural cores. Therefore, it is necessary to develop a set of artificial core technology, especially the preparation of basic skeleton, which is close to the hydrate formation. Based on the characteristics of the actual hydrate stratum, we selected the formations of Well Mount Elbert Unit C-GH1 in the permafrost region of Northern Alaska, which is rich in geologic information and well-hydrated reservoirs. The quartz sand epoxy resin was used to compress the cemented cores , The main factors affecting the permeability of artificial cores were analyzed through comprehensive experiments. Then, the permeability and porosity were used as experimental indexes to design the orthogonal experiment to study the influence of various factors on the indexes. The permeability and porosity closest to the target formation were determined 2 formulations, and by uniaxial mechanical compressive strength value comparison to further clarify the optimal formula. The experimental results show that the designed particle size ratio, permeability, uniaxial compressive strength and density of the optimal formulation and target formation are basically the same, and the porosity is relatively close. Using this technology flow can be prepared close to the in situ Hydrate sediment skeleton.