海洋地质前沿2025，Vol.41Issue(3)：65-77,13.DOI:10.16028/j.1009-2722.2024.235
二氧化碳封存断层构造区微震活动规律新认识
New understanding of microseismic activity in fault zones for geological carbon storage:a case study of the Decatur project in the United States
摘要
Abstract
Based on the U.S.Decatur CO2 storage project,the interrelationships between the formation thickness,tectonic stress state,and microseismic activity induced by CO2 injection during the carbon storage process were investigated in this study,providing a scientific basis for site selection and safety assessment of carbon storage.By analyzing the characteristics of the reservoir(Mt.Simon Sandstone)and caprock(Argenta Formation)thickness of the Decatur Project,the impact of these factors on pressure diffusion during injection was explored.Combining the distribution of tectonic stress and data accumulated in history,the sensitivity of fault slip in the Precambrian basement was analyzed.The Argenta Formation near the CO2 injection point is relatively thin or absent,lacking sufficient thickness to prevent pressure migration towards the basement fault,which resulted in microseismic events occurring mostly in the Precambrian basement.After CO2 injection into the Mt.Simon Sandstone reservoir,the pore pressure initially increased near the injection point,and then diffused over a larger area.Simple CO2 in-jection alone was not strong enough to trigger large-scale microseismic activity.The Precambrian basement is more sensitive to the stress release caused by fluid injection due to the tectonic stresses accumulated in history.In the Decatur Project,when the CO2 injection rate reached 1.25～1.4 million tons per year,fault slip and microseis-mic activity were induced.The selection of CO2 storage sites should be evaluated comprehensively based on the strata thickness,tectonic stress state,and the injection-induced mechanism to ensure the safety and long-term sta-bility of the injection.关键词
CO2地质封存/微震活动/断层构造/Decatur项目/THMC多场耦合Key words
CO2 geological storage/microseismic activity/fault structure/Decatur project/THMC coupling分类
地球科学引用本文复制引用
李永臣,罗子金,马科迪,方小宇,田华丰,吕言新,辛毅..二氧化碳封存断层构造区微震活动规律新认识[J].海洋地质前沿,2025,41(3):65-77,13.基金项目
国家自然科学基金"深层干热岩钻进井壁围岩宏细观破裂机理及稳定性控制研究"(52274231),"超深超高压气藏高效开采科学问题"(52034006) （52274231）
