Abstract: Shale gas, a typical unconventional natural gas mainly consisting of methane, is of great importance to optimize energy consumption structure and to mitigate energy dependence on import. Previous study has shown that shale gas is present in shale reservoir mainly due to adsorption. Thus, a review of adsorption performance of shale is of importance for effective exploration of shale gas. In this work, the recent research progress of adsorption performance of shale is summarized. The adsorption mechanism of shale gas is analyzed. The future work focused on shale and shale gas is also indicated. Shale gas in shale reservoir is accumulated as free state, dissolved state and adsorbed state. The shale gas in adsorbed state accounts for more than forty percent of the total amount of shale gas. Shale gas reserve is greatly dependent on physico-chemical characteristics, temperature and pressure of shale reservoirs. Although investigations on shale gas have been initiated, the depth and scope of study is still inferior to other unconventional natural gas, such as coal-bed methane. Thus, future investigations on adsorption performance of shale could include ①exploration of the geologic characteristics of shale gas reservoirs, ②elaboration of fluid-solid interaction between methane and shale, and ③further implementation of CO₂ sequestration in shale reservoirs with enhanced shale gas recovery due to superior adsorption performance of CO₂ to methane.

Key words: shale, shale gas, methane, adsorption

摘要： 页岩气(主要组分为甲烷)作为一种新兴的非常规天然气,其对于优化能源消费结构、缓解能源对外依存度具有重要意义。相关研究表明,吸附态是页岩气的主要赋存形态,因此明确页岩吸附性能及作用规律是页岩气有效开采的重要前提。为此,本文结合国内外相关研究工作,分析了页岩的吸附特性,归纳了影响页岩吸附能力的因素,指出了页岩及页岩气后续研发方向。分析表明:页岩储层内部页岩气的赋存形态主要包括游离态、溶解态和吸附态,其中吸附态页岩气含量至少占页岩气总含量的40%;页岩气吸附量与页岩储层理化性质、储层温度和压力均有关。虽然国内外已对页岩气开展大量研究工作,但是相比于煤层气等非常规天然气研究仍显不足。为此,关于页岩吸附性能及作用规律需要在以下方面开展研究工作:①进一步探明页岩储层地质特征;②深入明确甲烷和页岩之间的流固作用关系;③利用页岩对甲烷和CO₂吸附性能的差异,推进注入CO₂强化页岩气采收率技术。

关键词: 页岩, 页岩气, 甲烷, 吸附