天然气水合物储层渗透率研究进展

天然气水合物是清洁、高效、储量巨大的未来最具潜力资源之一,而储层的渗透率是影响水合物资源开采时产气效率的重要参数。目前,国内外对天然气水合物储层的渗透率进行了大量的研究并取得一定进展,本文从数值模拟、储层现场探井、实验研究等方面全面回溯,分析总结了孔隙度、饱和度、应力应变情况等对储层渗透率的影响,讨论目前储层渗透率研究存在人工合成水合物沉积物与自然储层存在差异,不同多孔介质形成的水合物沉积物应力敏感性不同,多相渗流研究不够充分,储层渗透率改造研究不足等问题,对未来的研究方向提出了展望。

Research Progress on Permeability of Natural Gas Hydrate Sediments

Natural gas hydrate (NGH) is an environmentally friendly, efficient and huge reserves resource with great potential. The permeability of NGH reservoir is one of the key factors that determine the gas product efficiency of recovery. At present, a large number of studies on permeability of NGH reservoirs have been conducted. In this paper, the permeability research methods from the aspects of numerical simulation, field test, and experimental research were summarized. The effects of porosity, saturation, stress and strain on reservoir permeability were analyzed. The challenge faced by the research on NGH reservoir, such as the differences between artificial NGH sediments with natural reservoirs, different porous media with different stress sensitivity, insufficient research on multi-phase flow, and insufficient research on reservoir permeability reformation, were also discussed. The future research direction was finally prospected.