Quantification of solubility trapping in natural and engineered CO 2 reservoirs
Quantification of solubility trapping in natural and engineered CO 2 reservoirs
复制标题
天然和工程 CO 2 储层中溶解度捕获的量化
DOI：
10.1144/petgeo2020-120
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发表时间：
2021
影响因子：
1.7
通讯作者：
Leslie R
中科院分区：
文献类型：
--
作者：
Leslie R
CO2在地质储层中的安全保留对于有效储存至关重要。溶解度捕获是指CO2在地层水中的溶解作用，是天然CO2气藏地质时间尺度上的主要汇。CO2注入过程中的观察，结合CO2油藏模型，表明溶解度捕获立即开始。在几年和几十年的可观测工程时间尺度和天然CO2储层代表的>10 kyr状态之间，溶解速率的演变存在不确定性。 少数研究限制了天然类似物的溶出速率。研究表明，溶解性圈闭是继构造圈闭之后的主要封存机制，在整个储层中去除了10-50%的CO2。天然类似物、工程油藏和模型研究对CO2溶解分数和溶解速率产生了广泛的估计。在几个模型中，固定油气藏和工程油气藏没有显示出高比例的溶解CO2。来自天然类似物的证据支持一种模型，即在建立稳定的气水接触之前，大多数溶解发生在侵位和迁移过程中。CO2溶解速率随时间的快速下降表明，模拟储层在大部分CO2停留时间内处于溶解平衡状态。补充材料：所有图的溶解速率和情景A和B的指数函数曲线可在https://www.lyellcollection.org/cc/geoscience-for-co2-storagehttps://doi.org/10.6084/m9.figshare.c.5476199Thematic
Secure retention of CO2in geological reservoirs is essential for effective storage. Solubility trapping, the dissolution of CO2into formation water, is a major sink on geological timescales in natural CO2reservoirs. Observations during CO2injection, combined with models of CO2reservoirs, indicate the immediate onset of solubility trapping. There is uncertainty regarding the evolution of dissolution rates between the observable engineered timescale of years and decades, and the >10 kyr state represented by natural CO2reservoirs. A small number of studies have constrained dissolution rates within natural analogues. The studies show that solubility trapping is the principal storage mechanism after structural trapping, removing 10–50% of CO2across whole reservoirs. Natural analogues, engineered reservoirs and model studies produce a wide range of estimates on the fraction of CO2dissolved and the dissolution rate. Analogue and engineered reservoirs do not show the high fractions of dissolved CO2seen in several models. Evidence from natural analogues supports a model of most dissolution occurring during emplacement and migration, before the establishment of a stable gas–water contact. A rapid decline in CO2dissolution rate over time suggests that analogue reservoirs are in dissolution equilibrium for most of the CO2residence time.Supplementarymaterial:Dissolution rate for all plots and exponential function curves for scenarios A and B are available at https://doi.org/10.6084/m9.figshare.c.5476199Thematic collection:This article is part of the Geoscience for CO2storage collection available at: https://www.lyellcollection.org/cc/geoscience-for-co2-storage