低渗透储层CO2注入诱导的渗透率演化对CO2储存和CH4产量的影响

IF 3.6 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Chemical Geology Pub Date : 2025-08-22 DOI:10.1016/j.chemgeo.2025.123014

Danqing Liu , Zexing Zhang , Sen Yang , Qi Yu , Ramesh K. Agarwal , Yilian Li

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引用次数: 0

摘要

注CO2诱导的地球化学反应通过改变页岩孔隙度和渗透率，对CO2增强页岩气采收率有重要影响。然而，这种影响很少被量化。为了确定和量化CO2-水-岩反应在页岩渗透率演化中的作用及其对CH4生成和CO2封存的影响，通过耦合CO2注入对岩石孔隙度和渗透率的地球化学和地质力学影响，建立了低渗透介质（10−22 ~ 10−18 m2）的多组分反应输运模型。通过实验和数值模拟探讨了CO2溶解和诱导的地球化学反应对CH4生成和CO2储存的影响。进行了敏感性分析，以识别由固有页岩和工程因素引起的不确定性。结果表明，由CO2-水-岩反应引起的孔隙度和渗透率变化非常有限（<1 %），可以通过控制储层压力扰动和CO2运移，对页岩CH4生产和CO2封存产生显著扰动。这些影响随着地球化学反应（如矿物溶解/沉淀）的范围和程度而动态变化，在本研究考虑的条件下，CH4产生的影响可达17 %，CO2储存的影响可达24 %。高压-高温（10-15 MPa, 40-80 ℃）、低基质渗透率（0.001-0.1 mD）和注入速率（0.05-0.2 kg/s）加剧了co2 -水-页岩反应的程度，从而加强了对页岩的影响。高注入速率和基质渗透率可以通过促进CO2运移来增强影响，但也会增加CO2的泄漏风险。该研究为CO2反应输运建模提供了一种实用的方法，为非常规资源开发和低渗透储层CO2储存提供了理论支持。

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Role of permeability evolution induced by CO2 injection on CO2 storage and CH4 production in a low permeability reservoir

CO₂-injection induced geochemical reactions exert important influence on CO₂ enhanced shale gas recovery by altering the shale porosity and permeability. This impact, however, has been seldomly quantified. To identify and quantify the role of CO₂-water-rock reactions in the evolution of shale permeability and its influence on CH₄ production and CO₂ sequestration, a multi-components reactive transport model for low permeability media (10⁻²² - 10⁻¹⁸ m²) is established by coupling the geochemical and geomechanical effects of CO₂ injection on rock porosity and permeability. The effect of CO₂ dissolution and induced geochemical reactions on CH₄ production and CO₂ storage is then explored with experiments and numerical simulations. A sensitivity analysis is conducted to identify the uncertainties induced by the inherent shale and engineering factors. Results show that a very limited variation in porosity and permeability (<1 %) induced by the CO₂-water-rock reactions could cause significant perturbation in CH₄ production and CO₂ sequestration in shale by controlling the pressure perturbation in the reservoir and the CO₂ migration. These impacts dynamically change with the extent and degree of geochemical reactions (e.g. mineral dissolution/precipitation), with up to 17 % for CH₄ production and 24 % for CO₂ storage at the conditions considered in this study. High pressure-temperature (10–15 MPa, 40–80 °C), low matrix permeability (0.001–0.1 mD) and injection rate (0.05–0.2 kg/s) strengthen the influence by aggravating the degree of CO₂-water-shale reaction. While high injection rate and matrix permeability can enhance the impact by promoting CO₂ migration, they can also increase the leakage risk of CO₂. This study provides the development of a practical methodology for the CO₂ reactive transport modeling as well as the theoretical support for development of unconventional resources and CO₂ storage in low permeable reservoirs.

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来源期刊

Chemical Geology 地学-地球化学与地球物理

CiteScore

7.20

自引率

10.30%

发文量

374

审稿时长

3.6 months

期刊介绍： Chemical Geology is an international journal that publishes original research papers on isotopic and elemental geochemistry, geochronology and cosmochemistry. The Journal focuses on chemical processes in igneous, metamorphic, and sedimentary petrology, low- and high-temperature aqueous solutions, biogeochemistry, the environment and cosmochemistry. Papers that are field, experimentally, or computationally based are appropriate if they are of broad international interest. The Journal generally does not publish papers that are primarily of regional or local interest, or which are primarily focused on remediation and applied geochemistry. The Journal also welcomes innovative papers dealing with significant analytical advances that are of wide interest in the community and extend significantly beyond the scope of what would be included in the methods section of a standard research paper.