检索结果-南通市图书馆

雨汪区块煤层气气体同位素变化特征及成因判识

在线全文

学校读者我要写书评

暂无评论

煤炭科学技术 2024年第7期52卷 148-157页

作者：王芳芳吴财芳杜明洋唐依然王聪文德修中国矿业大学煤层气资源与成藏过程教育部重点实验室江苏徐州221008 中国矿业大学资源与地球科学学院江苏徐州221116 宿州学院资源与土木工程学院安徽宿州234000 山西省煤炭地质勘查研究院有限公司山西太原030000 贵州省土地矿产资源储备局贵州贵阳550001

研究煤层气地球化学特征及其成因,对煤层气成藏及资源勘查开发具有重要意义。为探究滇东雨汪区块煤层气成因及其地球化学特征,采集该区6口典型煤层气井的产出气气样,开展了组分测定、碳同位素和稀有气体同位素测试,系统分析了煤层CH_(4)... 详细信息

研究煤层气地球化学特征及其成因,对煤层气成藏及资源勘查开发具有重要意义。为探究滇东雨汪区块煤层气成因及其地球化学特征,采集该区6口典型煤层气井的产出气气样,开展了组分测定、碳同位素和稀有气体同位素测试,系统分析了煤层CH_(4)、N_(2)等气体的成因,并结合水文地质环境,探讨了雨汪区块煤层气排采过程中气体的同位素变化及其控制因素。结果表明:雨汪区块煤层气井产出气中CH_(4)体积分数平均为73.95%~92.90%,乙烷、CO_(2)、N_(2)体积分数分别为0.20%~0.40%、0.05%~1.05%、6.15%~25.32%。此外,He仅在产气第1天检测到,而碳原子数大于2的烃类未检测到;煤层气干燥系数(C_(1)/C_(1~5))为0.9995~0.9997,属于高成熟干气;CH_(4)的δ^(13)C值为-36.7‰~-27.6‰,为有机质热成因气;CO_(2)的δ^(13)C值介于-19.1‰~-6.6‰,主体分布在-18.0‰~-14.3‰,为有机成因;氮气体积分数平均为12.63%,含量相对较高,其φ(N_(2))/φ(Ar)远大于84,以有机成因为主;氩气体积分数平均为0.06%,远大于0.017%,以大气成因为主;氦气体积分数平均为0.02%,φ(^(3)He)/φ(^(4)He)为0.29×10^(-8)~19.6×10^(-8),主体范围为2.00×10^(-8)~9.38×10^(-8),φ(^(3)He)/φ(^(4)He)与大气氦的比值介于0.01~0.09,属于典型的壳源氦气,且φ(^(4)He)、φ(^(20)Ne)的变化趋势与φ(^(4)He)/φ(^(20)Ne)具有一致性;随着排采时间增加,气体纯度增高,产出气的烷烃同位素值呈现逐渐变轻的趋势。研究认为,雨汪区块煤层气“变干、变轻”是气体解吸、扩散和水溶解作用综合影响的结果。

关键词：煤层气地球化学成因类型碳氢同位素雨汪区块

在线全文

学校读者我要写书评

暂无评论

气体水合物合成研究进展

油气藏评价与开发 2024年第2期14卷 267-276页

作者：吴财芳高彬李清陈贞龙中国矿业大学教育部煤层气资源与成藏过程重点实验室江苏徐州221116 中国矿业大学资源与地球科学学院江苏徐州221116 中国石化华东油气分公司江苏南京210000

水合物法捕集与封存CO_(2)气体可服务于大规模减排的技术需求,加速“碳中和”目标的实现,对应对气候变化具有重要意义。从气体水合物的基本性质、生成机理及模型,多孔介质中水合物合成,水合物合成的分子动力学模拟等方面,综述了前人针... 详细信息

水合物法捕集与封存CO_(2)气体可服务于大规模减排的技术需求,加速“碳中和”目标的实现,对应对气候变化具有重要意义。从气体水合物的基本性质、生成机理及模型,多孔介质中水合物合成,水合物合成的分子动力学模拟等方面,综述了前人针对水合物合成领域的研究现状,提出了气体水合物合成过程中存在的科学问题,并对气体水合物的发展及煤系地层CO_(2)水合物的封存方向进行了评价。研究认为,CO_(2)气体的溶解度是限制准确计算多孔介质中水合物储气量的关键因素;气体水合物的局部结构化(成核)机制复杂,仍需深入研究;高纬度及永久冻土区煤系地层可作为水合物法封存CO_(2)气体的地下空间。

关键词：水合物碳中和煤基介质 CO_(2)水合物合成研究进展

维普期刊数据库博看期刊

Morphology and Propagation of Hydraulic Fractures for CBM Wells

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2017年第5期91卷 1936-1937页

作者： wu caifang ZHANG Xiaoyang Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process of the Ministry of Education China University of Mining and Technology Xuzhou 221008 Jiangsu China School of Resources and Geosciences China University of Mining and Technology Xuzhou 221116 Jiangsu China

Objective As the most widely used and effective technique in reservoir reconstruction of unconventional natural gas,hydraulic fracturing has been achieved good effect in CBM *** is important to note that coal seam is ... 详细信息

关键词： In Morphology and Propagation of Hydraulic Fractures for CBM Wells

Experimental study on the coupling effect of pore-fracture system and permeability controlled by stress in high-rank coal

在线全文

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2023年第1期17卷 135-144页

作者： Jiang HAN caifang wu Lu CHENG Key Laboratory of Coalbed Methane Resources and Reservoir Formation(Ministry of Education of China) China University of Mining and TechnologyXuzhou 221116China School of Resources and Geoscience China University of Mining and TechnologyXuzhou 221116China China United Coalbed Methane Corporation Ltd.Beijing 100016China

During the coalbed methane(CBM)exploitation,the reservoir permeability can be affected by the effective stress that varies with the reservoir fluid pressure,which is a complex,dynamic and significant engineering *** analyze the response characteristics of the pore-fracture system by the changing stress,this work simulated reservoir and fluid pressures during the exploitation by adjusting confining pressure and displacement *** sensitivity experiments under different effective stresses were conducted to systematically study the stage variation characteristics of porosity and permeability of *** results show that the permeability decreases exponentially with the increase in effective stress,consistent with previous ***,the porosity shows a V-shaped trend,which is different from the traditional understanding that it would decrease continuously with rising effective *** variation characteristics(of porosity and permeability above)therefore result in a phased porosity sensitivity of coal permeability(PPS).Moreover,the stress sensitivity of the samples was evaluated using the permeability damage rate method(MPDR)and the stress sensitivity coefficient method(MCSS),both of which showed that it ranges from the degree of strong to extremely *** the effective stress is lower than 5–6 MPa,the stress sensitivity of the coal reservoir drops rapidly with effective stress rising;when it is higher than 5–6 MPa,the change in stress sensitivity tends to flatten out,and the stress sensitivity coefficient(CSS)goes down slowly with rising effective ***,suggestions are proposed for the drainage scheme of CBM wells based on the experimental results.

关键词： stress sensitivity porosity sensitivity permeability high-rank coal effective stress

Interlayer interference mechanism of multi-seam drainage in a CBM well:An example from Zhucang syncline

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2016年第6期26卷 1101-1108页

作者： Jiang Wei wu caifang Wang Qiao Xiao Zhenghui Liu Yang Hunan Provincial Key Laboratory of Shale Gas Resource Utilization Hunan University of Science and Technology Institute of Geology School of Civil EngineeringHunan University of Science and Technology School of Resource & Geoscience China University of Mining and Technology

Based on the characteristics of the strong volatility of physical property in vertical direction, high gas content, high resource abundance and large exploitation potentiality of coal reservoir in Bide-Santang basin of Zhina coal field, we study the generation mechanism of interlayer interference, propagation rules of reservoir pressure drop and influencing factors of gas productivity in CBM multi-seam drainage in the paper. On the basis of the actual production data of X-2 well of Zhucang syncline in Bide-Santang basin,by simulating the gas production process of a CBM well under the condition of multiple seam with COMET3 numerical simulation software, we analyze the influencing factors of gas productivity during the process of multi-seam drainage, and illuminate the interlayer interference mechanism of multiseam drainage. The results show that permeability, reservoir pressure gradient, critical desorption pressure and fluid supply capacity of stratum have great influence on gas productivity of multi-seam drainage while coal thickness has little influence on it. Permeability, reservoir pressure gradient and fluid supply capacity of stratum affect the propagation velocity of reservoir pressure drop and thereby affect the final gas productivity. Moreover, the influence of critical desorption pressure on gas productivity of multiseam drainage is reflected in the gas breakthrough time and effective desorption area.

关键词： Zhucang syncline CBM Multi-seam drainage Interlayer interference Influencing factors

Combined control of fluid adsorption capacity and initial permeability on coal permeability

在线全文

学校读者我要写书评

暂无评论

International Journal of Coal Science & Technology 2022年第6期9卷 127-137页

作者： Xiaolei Liu Jianping Wei Guoying Wei caifang wu Cao Liu Xiaoming Ni State Key Laboratory Cultivation Base for Gas Geology and Gas Control Henan Polytechnic University454000 JiaozuoHenanChina College of Safety Science and Engineering Henan Polytechnic University454000 JiaozuoHenanChina State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization 454000 JiaozuoHenanChina Key Laboratory of Coalbed Methane Resource and Reservoir Formation Process Ministry of EducationSouth Jiefang Road221008 XuzhouJiangsuChina Collaborative Innovation Center of Coalbed Methane(Shale Gas)in Central Plains Economic Zone 454000 JiaozuoChina

The variations of strain and permeability of coal were systematically studied through the physical simulation of N2 and water *** effects of fluid adsorption capacity and initial permeability on strain,permeability and the dominant effect of pore pressure were *** adsorption strain and strain rate of coal during water injection are significantly higher than those during N2 *** edge of free adsorption exists in the early phase of N2 and water injection,which is related to fluid *** this boundary,the strain rate and pore pressure are ***,the injec-tion time of initial stage accounts for about 20%of the total injection time,but the strain accounts for 70%of the total *** water injection,this boundary is about half of water saturation of ***,the influence of pore pressure on permeability is complex,which is controlled by adsorption capacity and initial permeability of *** the initial permeability is large enough,the effect of adsorption strain on permeability is relatively weak,and the promoting effect of pore pressure on fluid migration is ***,the permeability increases with increasing pore *** the initial permeability is relatively low,the pore pressure may have a dominant role in promoting fluid migration for the fluid with weak adsorption ***,for the fluid with strong adsorption capacity,the adsorption strain caused by pore pressure may play a leading role,and the permeability reduces first and then ascends with increasing pore pressure.

关键词： Initial permeability Adsorption capacity Free adsorption Pore pressure Coal strain

Self-adjusted elastic action and its CBM pool-forming effect of the high rank coal reservoir

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2005年第S1期50卷 99-103页

作者： QIN Yong FU Xuehai wu caifang FU Guoyou BU Yingying Institute of Mineral Resources and Geoscience China University of Mining&TechnologyXuzhou 221008China

The coal reservoir is a kind of geologic body with considerable elasticity, and its response to stress is more sensitive than the routine ones. In the pool-forming process of the coalbed methane, (CBM) the action of many external geodynamic factors in the coal reservoir is represented by the ability of CBM’s diffusion and migration in the coal reservoir. Therefore, the occurrence of the natural fissures in the coal reservoir becomes a key that determines whether the CBM pool can be formed or not. Based on the principle, the authors have designed a comprehensive method of physical modeling to study the elasticity of the coal matrix block with different coal ranks in the light of the solid to fluid coupling, have established the model of the volume deformation (self-adjusted elastic effect) of the coal reservoir under the condition of the effective stress-adsorption/desorption, and have obtained a correct understanding of the law of the elastic deformation. Afterwards, a new viewpoint, named as the self-closing elastic effect for forming the CBM pool in the high rank reservoir, is put forward, providing an initial point and a scientific basis for a further investigation into its dynamic factors, possible mechanism and role in the CBM energy-balancing system.

关键词： coalbed methane reservoir elasticity self-adjusted action pool-forming effect.

Effective migration system of coalbed methane reservoirs in the southern Qinshui Basin

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2014年第12期57卷 2978-2984页

作者： wu caifang QIN Yong ZHOU LongGang School of Resource and Earth Sciences China University of Mining & Technology Key Laboratory of CBM Resource and Formation History Ministry of Education

Effective migration system of coalbed methane(CBM)reservoir,which was controlled by development degree and opening-closing degree of fractures,determines the permeability of coal reservoir and can be characterized by the pore-fracture system in the extrinsic *** this paper,based on coal matrix elastic self-regulating effect theory and coal reservoir combined elastic energy theory,the fracture opening-closing degree parameterΔand the fracture development degree parameterξare suggested for the quantitative study of the effective migration system of CBM reservoir in southern Qinshui ***,the control functions ofξandΔto CBM enrichment and high production are *** results show that in present stage the area with highξvalue is located in Anze and Qinyuan,and then Zhengzhuang and Fangzhuang,where fracture development degree is *** area with highΔvalue is located in Zhengzhuang and Fanzhuang,and then Anze and Qinyuan,indicating where coal matrix elastic self-regulating positive effect dominates and fractures tend to be *** the comprehensive analysis onξandΔ,it can be found that their best match area is located in Zhengzhuang and Fanzhuang,with high values for fracture development degree and opening-closing degree probably bringing about high fluid pressure and good permeability of reservoirs,which are advantageous to an abundant CBM production.

关键词： CBM reservoirs effective migration system opening-closing degree of fracture development degree of fracture permeability

在线全文

学校读者我要写书评

暂无评论

贵州深部煤层气地质特征及其资源潜力

煤炭学报 2024年第S1期49卷 348-361页

作者：杨兆彪高为秦勇张孟江李存磊颜智华梁宇辉卢本举陈义林吴财芳陈捷李庚文德修中国矿业大学煤层气资源与成藏过程教育部重点实验室贵州大学资源与环境工程学院贵州省煤层气页岩气工程技术研究中心贵州省煤田地质局贵州省土地矿产资源储备局

加快深部（1 000 m以深）煤层气资源勘探开发是煤层气走向规模化开发的重要途径，是近年来煤层气产业的重要发展方向。贵州省煤层气资源丰富，深部煤层气资源占比大，然而目前尚未开展深部煤层气资源的地质研究和勘探开发。立足于贵州... 详细信息

加快深部（1 000 m以深）煤层气资源勘探开发是煤层气走向规模化开发的重要途径，是近年来煤层气产业的重要发展方向。贵州省煤层气资源丰富，深部煤层气资源占比大，然而目前尚未开展深部煤层气资源的地质研究和勘探开发。立足于贵州煤层气地质背景，基于大量的煤层气试井资料和测试化验资料，分析了深部煤层气地质特征及其资源潜力。研究结果显示：贵州深部煤层气资源主要分布于六盘水、黔北和织纳煤田的众多向斜单元。沉积分异和构造分区导致深部煤储层地质条件具有区域差异性，六盘水煤田以“超压明显、低温、较高应力”为特征，织纳煤田以“超压、较高温度、较低应力”为特征，黔北煤田以“超压、高温、高应力”为特征。深部煤储层渗透率偏低，1 000 m以深渗透率将普遍低于0.1×10-15m2。煤储层含气量较高，在1 000 m以浅，以六盘水煤田为代表的中阶煤储层平均含气量为10.03 m3/t，以织纳、黔北煤田为代表的高阶煤储层平均含气量为14.51 m3/t,400 m以深超饱和现象较为明显。优选游离气、吸附气预测模型，考虑煤阶随深度的变化，预测深部整体含气量将进一步增加，超饱和现象更为明显，游离气占比增大，在2 000 m左右，游离气占比普遍达到10%～25%，且中阶煤游离气占比要高于高阶煤。在此基础上，计算了包含2 000 m以深的贵州省重点向斜的煤层气地质资源量，贵州省煤层气地质资源量为3.85万亿m3，其中1 000 m以深煤层气地质资源量达到了1.90万亿m3，六盘水和黔北煤田深部煤层气资源占比大。综合考虑资源规模和资源丰度，提出了开发次序建议，盘关—土城—照子河—旧普安向斜和格目底向斜为首选开发单元，以上向斜均属于高丰度大型气田。

关键词：贵州深部煤层气地质特征吸附气游离气资源潜力