CO2气体非常规储存方法

随着《京都议定书》的实施，如何经济有效地控制CO₂的排放量，减缓温室效应对我国已显得越来越迫切。非常规储存是将排放到大气中的CO₂，通过采集回注到地下煤气层、废油气储层或深海盐水储层中储存的方法，主要有CO₂水合物法、煤层气置换法、CO₂驱替甲烷水合物、注CO₂提高原油或凝析油的采收率、深海盐水储层储存法等。从储存的机理方面介绍了各种非常规储存CO₂的方法，并从技术和经济的角度对各种方法进行了评价。指出对于具有相同烃类孔隙体积的油气藏来说，由于气体更容易压缩，地质构造封闭性好，气藏、凝析气藏在储存CO₂方面具有更大的优势。

RESEARCHES ON UNCONVENTIONAL CARBON DIOXIDE STORAGE METHOD

Unconventional storage refers to the method which injects CO2 separated from waste gas emitted into air back into coalbed methane reservoir, depleted oil and gas reservoir or deep saline aquifers. The main methods include CO2 hydrate method, CO2 enhanced coalbed methane recovery (CO2 ECBMR), CH4 hydrate exploitation by CO2, CO2 enhanced oil recovery (CO2 EOR), and deep saline aquifer storage method, etc. This paper introduces a variety of unconventional storage methods in terms of storage mechanism and evaluated these methods in terms of technology and economic benefit. The paper also points out that for the oil and gas reservoirs with same hydrocarbon voids volumes, gas reservoirs and condensate gas reservoirs have greater advantages in CO2 storage, because the gas can be easily compressed and the geological structure of gas reservoir features good sealing property.