煤矸石是煤炭开采和洗选过程中产生的固体废弃物,其中含有钾、铁、硅、锰等植物所需的微量元素,具有用于农业领域的潜力。本文以中国知网(CNKI)和Web of Science(WOS)核心合集数据库中检索的文献数据为基础,利用CiteSpace软件对煤矸石...煤矸石是煤炭开采和洗选过程中产生的固体废弃物,其中含有钾、铁、硅、锰等植物所需的微量元素,具有用于农业领域的潜力。本文以中国知网(CNKI)和Web of Science(WOS)核心合集数据库中检索的文献数据为基础,利用CiteSpace软件对煤矸石农业化利用领域的研究现状进行分析。结果表明:煤矸石农业化利用领域的发文量自1993年以来呈上升趋势,经历了初期探索、学科体系完善和快速发展3个阶段,形成了煤矸石与土壤改良,煤矸石与重金属两大重点研究领域,共6个研究方向;通过添加外源物质改善煤矸石基质性质、利用煤矸石制备新型肥料和土壤改良剂是当前的研究热点;开发新型煤矸石基土壤改良剂、推动煤矸石的资源化利用、评估其对土壤质量和生态系统服务功能的影响、加强煤矸石与其他材料的复合应用,是未来煤矸石农业化利用研究的重要方向。展开更多
One of the pathways to attain NET ZERO is CO_(2)injection into deep saline aquifers(DSAs),which alters the saturation and pore pressure of the reservoir rocks,hence the effective stress,sʹ.This,in turn,would change th...One of the pathways to attain NET ZERO is CO_(2)injection into deep saline aquifers(DSAs),which alters the saturation and pore pressure of the reservoir rocks,hence the effective stress,sʹ.This,in turn,would change their geomechanical(i.e.peak deviatoric stress,elastic modulus,Poisson's ratio)and petrophysical(porosity and permeability)properties.Such a situation might trigger geo-hazards,like induced seismicity,ground deformation,caprock failure.Hence,reducing the risk of such hazards necessitates quantifying the spatial and temporal changes in sʹ,under specific CO_(2)and/or brine saturation,designated as S_(CO2)and S_(b),respectively,and resultant pore pressure.With this in view,a conceptual model depicting the reservoir,demarcated by five zones based on variations in saturation,pore-pressure,temperature,etc.,and the corresponding effective stress equations have been proposed based on the available literature.Furthermore,a critical review of literature has been carried out to decipher the limitations and contradictions associated with the findings from(i)laboratory studies to estimate S_(CO2)employing pwave velocity and electrical resistivity,(ii)analytical and numerical approaches for estimating the variation of pore-pressure in the reservoir rocks,and(iii)laboratory studies on variation in geomechanical and petrophysical properties under the conditions representative of the above-mentioned zones of the conceptual model.The authors consider that extensive experiments should be conducted on the rocks from different sources and tested under various conditions of the CO_(2)injection to validate the proposed model for the execution of risk-free CO_(2)storage in DSAs.展开更多
文摘煤矸石是煤炭开采和洗选过程中产生的固体废弃物,其中含有钾、铁、硅、锰等植物所需的微量元素,具有用于农业领域的潜力。本文以中国知网(CNKI)和Web of Science(WOS)核心合集数据库中检索的文献数据为基础,利用CiteSpace软件对煤矸石农业化利用领域的研究现状进行分析。结果表明:煤矸石农业化利用领域的发文量自1993年以来呈上升趋势,经历了初期探索、学科体系完善和快速发展3个阶段,形成了煤矸石与土壤改良,煤矸石与重金属两大重点研究领域,共6个研究方向;通过添加外源物质改善煤矸石基质性质、利用煤矸石制备新型肥料和土壤改良剂是当前的研究热点;开发新型煤矸石基土壤改良剂、推动煤矸石的资源化利用、评估其对土壤质量和生态系统服务功能的影响、加强煤矸石与其他材料的复合应用,是未来煤矸石农业化利用研究的重要方向。
基金The authors would like to acknowledge the grant of fellowship(DST/TMD/EWO/2K21/ACT/2021/02(G))under Project SHARP,received from the Department of Science and Technology,Government of India.
文摘One of the pathways to attain NET ZERO is CO_(2)injection into deep saline aquifers(DSAs),which alters the saturation and pore pressure of the reservoir rocks,hence the effective stress,sʹ.This,in turn,would change their geomechanical(i.e.peak deviatoric stress,elastic modulus,Poisson's ratio)and petrophysical(porosity and permeability)properties.Such a situation might trigger geo-hazards,like induced seismicity,ground deformation,caprock failure.Hence,reducing the risk of such hazards necessitates quantifying the spatial and temporal changes in sʹ,under specific CO_(2)and/or brine saturation,designated as S_(CO2)and S_(b),respectively,and resultant pore pressure.With this in view,a conceptual model depicting the reservoir,demarcated by five zones based on variations in saturation,pore-pressure,temperature,etc.,and the corresponding effective stress equations have been proposed based on the available literature.Furthermore,a critical review of literature has been carried out to decipher the limitations and contradictions associated with the findings from(i)laboratory studies to estimate S_(CO2)employing pwave velocity and electrical resistivity,(ii)analytical and numerical approaches for estimating the variation of pore-pressure in the reservoir rocks,and(iii)laboratory studies on variation in geomechanical and petrophysical properties under the conditions representative of the above-mentioned zones of the conceptual model.The authors consider that extensive experiments should be conducted on the rocks from different sources and tested under various conditions of the CO_(2)injection to validate the proposed model for the execution of risk-free CO_(2)storage in DSAs.
