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随着北美页岩气勘探开发的成功,页岩气资源越来越受到重视.我国页岩气层评价从勘探和开发等多个方面也得到了迅猛发展.页岩储层较为致密,以较小的纳米级微孔隙微裂缝作为主要储集空间,具有与常规储层不同的储集空间特征,因此决定了油气储集的特殊性.天然气在页岩中多以游离态和吸附态两种赋存状态为主,并且吸附气占主要组成部分.因此研究天然气在页岩中的吸附机理,建立吸附模型,对于页岩气储层含气性评价具有至关重要的作用.本文对页岩气储层特点进行简要介绍,提出现有页岩吸附模型的局限性,简要介绍并总结了近几年常用的页岩亚临界吸附模型和超临界吸附模型的基本思路,对页岩气的勘探开发具有一定参考作用和指导意义.
With the successful exploration and development of shale gas in North America, shale gas resources have been paid more and more attention, and the evaluation of shale gas reservoirs in China has also made rapid development in many aspects such as exploration and development. The small nano-scale micro-pore micro-fractures as the main reservoir space, with different reservoir characteristics of conventional reservoirs, thus determining the peculiarities of oil and gas reservoirs.Natural gas in the shale mostly free and adsorption of two kinds of Fu And the adsorbed gas is the main component.Therefore, to study the adsorption mechanism of natural gas in shale and to establish the adsorption model is very important for the evaluation of gas content in shale gas reservoirs.In this paper, Reservoir characteristics of a brief introduction to the existing limitations of shale adsorption model briefly introduced and summarized in recent years common shale subcritical adsorption model and the basic idea of supercritical adsorption model for the exploration and development of shale gas Has some reference and guiding significance.