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Effect of temperature and stress on molecular structure and carbon monoxide generation of lignite from Kailuan mining area

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International Journal of Mining Science and Technology 2016年第3期26卷 437-441页

作者： Xiao Cangyan wei chongtao Guo Li Wen Shen Jian Key Laboratory of Coalbed Methane Resources & Reservoir Formation Processes Ministry of Education School of Resources and Earth Science China University of Mining and Technology North China Institute of Aerospace Engineering

In order to analyze the origin of carbon monoxide(CO) in coal seams, stress–strain experiments under temperature of 50, 150 and 250 °C were conducted using lignite from Kailuan mining area. Fourier transform infrared spectroscopy and elemental analysis were carried out before and after deformation of the samples. The results indicated that CO generated at 150 and 250 °C; the gas component was mostly oxygen(O_2), with small amount of carbon dioxide(CO_2), methane(CH_4) and hydrogen(H_2). At 50 °C, O_2 and a little CO_2 were observed and no CO was found. The carbon content of the coal samples increased slightly after deformation, and the oxygen content, H/C ratio, and O/C ratio decreased. The molecular structure of coal displayed different evolution characteristics at various temperatures. At 50 and 150 °C, the falling off of side chains, broken of ether bond and directional realignment of the aliphatic chains resulting in the formation of long chains were the main performance of coal molecular structure evolution. While at 250 °C, the side chains fell off and short chains formed. Furthermore, at both 150 and 250 °C, condensed degree of aromatic ring increased. Under the action of temperature and pressure, CO forms in two *** first is that ether bond breaks, oxygen and carbon atoms combine together and forms CO, or O_2 forming in the broken of ether–oxygen bond leads to the oxidation of free radicals and resulting in the formation of CO. And the second is that CO derives from falling off of C=O group.

关键词： Lignite Molecular structure Carbon monoxide generation Deformation Temperature

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New Discovery on Methane Adsorption Change of Coal due to Sc-CO_2 Extraction during CO_2-ECBM

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Acta Geologica Sinica(English Edition) 2018年第6期92卷 2438-2439页

作者： CHEN Run ZHANG Pengfei QIN Yong wei chongtao WANG Linlin Key Laboratory Coal-based CO2 Capture & Geological Storage of Jiangsu Province (Low Carbon Energy Institute China University of Mining and Technology) Henan Key Laboratory for Green and Efficient Mining & Comprehensive Utilization of Mineral Resources Henan Polytechnic University School of Resource and Geoscience China University of Mining and Technology(Key Laboratory of Coalbed Methane Resource & Reservoir Formation HistoryMinistry of Education)

Objective The technical development of COstorage and enhanced coalbed methane(CO-ECMB) recovery requires reliable and detailed information on gas adsorption. In most cases of geo-storage COis injected in the supercritical state(Tc=31.1 °C, Pc=7.38 MPa). In the supercritical state, the fluid of supercritical CO(Sc-CO) can not only react with minerals under the condition of water, but also extract small organic molecules from coal

关键词： Sc CO

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Quantitative identification of coal-type gas and oil-type gas in source-mixed gas at the northern margin of Qaidam Basin

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International Journal of Mining Science and Technology 2013年第3期23卷 435-439页

作者： Bao Yuan wei chongtao Peng Dehua Jiang Bo Wang Chaoyong School of Resources and Geosciences China University of Mining & Technology Key Laboratory of CBM Resource and Reservoir Formation Process Ministry of Education Qinghai Petroleum Exploration and Development Research Institute

The current study tested the gas component and carbon isotopic composition of gas samples from 6 oilgas fields at the northern margin of Qaidam Basin, and established a chart to quantitatively identify the mixing ratio of source-mixed gas. Besides, this research quantitatively investigated the natural gas generated by different types of organic matter. The results show that different ratios of source-mixed gas exist in the 6 oil-gas fields at the northern margin of Qaidam Basin. Among them, Mabei has the highest mixing ratio of coal-type gas, followed by Nanbaxian, Mahai, Lenghu-4, Lenghu-3 and Lenghu-5, with the ratios of coal-type gas 91%, 87%, 83%, 66%, 55% and 36%, respectively. Lenghu-3 and Lenghu-4 oil-gas fields were mainly filled by coal-type gas earlier. For Lenghu-3, the gas was mainly generated from low matured source rocks in lower Jurassic Series of Lengxi sub-sag. For Lenghu-4, the gas was mainly generated from humus-mature source rocks in lower Jurassic Series of the northern slope of Kunteyi sub-sag. Gas in Lenghu-5 was mainly later filled oil-type gas, which was generated from high matured sapropelics in lower Jurassic Series of Kunteyi sub-sag. Earlier filled coal-type gas was the main part of Mahai, Nanbaxian and Mabei oil-gas fields. Gas source of Mahai was mainly generated from high mature humics in lower Jurassic Series of Yibei sub-sag; for Nanbaxian, the gas was mainly generated from high matured humics in middle-lower Jurassic Series of Saishiteng sub-sag; for Mabei, the gas was mainly generated from humus-mature source rocks in middle Jurassic Series of Yuqia sub-sag.

关键词： Source-mixed gas Quantitative identification Coal-type gas Oil-type gas Northern margin of Qaidam Basin

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Productivity of coalbed methane wells in southern of Qinshui Basin

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Mining Science and Technology 2010年第5期20卷 765-769,777页

作者： ZOU Mingjun wei chongtao PAN Haiyang SESAY K Santigie CAO Jia School of Resources and Geoscience China University of Mining & Technology Xuzhou 221116 China Key Laboratory of CBM Resource and Reservoir-Generating Process Ministry of Education Xuzhou 221008 China

Based on regional CBM geological characteristics and drainage data of three typical Coalbed Methane(CBM) wells in the southern Qinshui Basin,history matching,productivity prediction and factor analysis of gas production control are conducted by using COMET3 reservoir modeling *** results show that in the next 20 years,the cumulative and average daily gas production of the QN01 well are expected to be 800×104 m3 and 1141.1 m3/d,for the QN02 well 878×104 m3 and 1202.7 m3/d and 97.5×104 m3 and 133.55 m3/d for the QN03 *** content and reservoir pressure are the key factors controlling gas production in the area;coal thickness,permeability and porosity are less important;the Langmuir volume,Langmuir pressure and adsorption time have relatively small *** the process of CBM recovery,the material source and driving force are the key features affecting gas productivity,while the permeation process is relatively important and the desorption process has some impact on gas recovery.

关键词： reservoir modeling history matching productivity prediction COMET3

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Fractal classification and natural classification of coal pore structure based on migration of coal bed methane

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Chinese Science Bulletin 2005年第S1期50卷 66-71页

作者： Xuehai Fu Yong Qin Wanhong Zhang chongtao wei Rongfu Zhou China Univ Min & Technol Coll Mineral Resource & Earth Sci Xuzhou Peoples R China

According to the data of 146 coal samples measured by mercury penetration, coal pores are classified into two levels of 65 nm seeping pore by fractal method based on the characteristics of diffusion, seepage of coal bed methane(CBM) and on the research results of specific pore volume and pore structure. The diffusion pores are further divided into three categories: 1000 nm macropore based on the abrupt change in the increment of specific pore volume.

关键词： coal pore structure fractal classification coal bed methane natural classification.

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Volume and Surface Distribution Heterogeneity of Nano-pore in Coal Samples by CO2 and N2 Adsorption Experiments

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Acta Geologica Sinica(English Edition) 2020年第5期94卷 1662-1675页

作者： ZHANG Junjian wei chongtao LUO Jinhui LU Guanwen QUAN Fangkai ZHENG Kai PENG Yujie College of Earth Sciences&Engineering Shandong University of Science and TechnologyQingdaoShandong 266590China School of Resources and Earth Science China University of Mining and TechnologyXuzhouJiangsu 221116China Construction Equipment College Guizhou Polytechnic of ConstructionGuiyang 551400China

In this paper,the heterogeneity of adsorption pores in middle and high rank coal samples were analyzed by using low temperature N2 and CO2 adsorption technology and fractal *** following results were achieved.1)According to the results of volume and surface fractal dimension,meso-pores can be classified into Mep-1,Mep-2,and Mep-3,***-pore can be classified into Mip-1,Mip-2,and Mip-3,respectively.2)Pore types play an important role in affecting the heterogeneity of *** volume heterogeneity(VHY)of Mep-1 is simpler than that of Mep-2 and Mep-3 in type A ***,the VHY of Mep-1 becomes gradually larger than that of Mep-2 and Mep-3 from type A to type B and *** VHY of open pore in the same diameter is higher than that of semi-open or closed ***,the surface heterogeneity(SHY)of types A and B samples is significantly larger than that of type C,the SHY of semi-open or closed pores is more complicated than that of open pores.3)Coal rank mainly affects the heterogeneity of *** heterogeneity of type A is always smaller than that of type B and *** VHY of Mip-1 is more complicated than that of Mip-2 and Mip-3 in the same samples,and the sensitivity of the VHY of Mip-1 and Mip-2 to the degree of coal rank is smaller than that of ***,the SHY of Mip-1 and Mip-2 is simpler than that of Mip-3 in the same sample,the SHY of micro-pores remains stable as the pore size decreases,and the affect of coalification level on SHY decreases with the decrease in pore ***-scale fractal characterization has enabled quantitative characterization of adsorption pore properties and provided useful information with regards to the similarity of pore features in different coal reservoirs.

关键词： pore volume and surface fractal dimension adsorption pore middle and high rank coal western Guizhou and eastern Yunnan area

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Characteristics of the ore forming fluid from the zinc poly-metallic deposit in the Mopan mine area,Guangxi Nandan

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International Journal of Mining Science and Technology 2012年第5期22卷 607-611页

作者： Santigie Kekuda Sesay Ou Zheng wei chongtao Luo Jun Bao Yuan School of Resource and Earth Science China University of Mining & Technology Xuzhou 221008 China Guangxi Zhuang Autonomous Region Institute of Geophysical Exploration Liuzhou 545005 China

Fluid inclusions from samples from the layered and veined mineralized belt in the Mopan mine area were studied using microscopic temperature measurements and laser Raman *** studies were conducted on the nature and source of the ore forming fluid and on the mechanism of deposit *** results show that there are three types of inclusions that occur in both the layered and veined ore *** are liquid inclusions,CO 2 inclusions with a liquid phase,and NaCl-H 2 O multiphase *** fluid inclusions in both the layered and veined ore bodies have similar *** ore forming fluid is strongly reducing,was exposed to low to medium temperatures,salinity,and *** source of this ore forming fluid was a mix of submarine volcanic spring(blow-piping),magmatic hydrothermal jet,and underground water.

关键词： Hydrothermal deposit Ore forming fluid Ore formation Mopan mine area

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New Discovery on Supercritical CO2-H2O Treated Coal： Pore Structure and Methane Adsorption

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Acta Geologica Sinica(English Edition) 2017年第4期91卷 1509-1510页

作者： CHEN Run WANG Youyang QIN Yong WANG Linlin wei chongtao ZHANG Pengfei Low Carbon Energy Institute China University of Mining and Technology (Key Laboratory Coal-based CO2 Capture & Geological Storage of Jiangsu Province) Xuzhou 221008 Jiangsu China School of Resource and Geoscience China University of Mining and Technology (Key Laboratory of Coalbed Methane Resource & Reservoir Formation History Ministry of Education) Xuzhou 221008 Jiangsu China

Nowadays, the governments and worldwide energy and environmental scientists have been focusing on CO2 enhanced coalbed methane recovery （CO2-ECBM） to reduce greenhouse gas emissions and to increment coalbed methane production. Previous researches have confirmed that CO2 can react with minerals in coal seams to transform the permeability of coal. However, few studies have paid attention to the influence of the reaction of CO2 with minerals on the pore distribution and methane adsorption of coals.

关键词： New Discovery on Supercritical CO2-H2O Treated Coal:Pore Structure and Methane Adsorption CO XRF

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The evidence of fission-track data for the study of tectonic thermal history in Qinshui Basin

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Chinese Science Bulletin 2005年第S1期50卷 104-110页

作者： REN Zhanli XIAO Hui LIU Li ZHANG Sheng QIN Yong wei chongtao The Key Laboratory of Continental Dynamics of Ministry of Education Northwest UniversityXi’an 710069China Geology Department Northwest UniversityXi’an 710069China Chinese Mineral Industry University Xuzhou 221008China

The thermal history of the Qinshui Basin has been studied by using the fission-track analysis of apatite and zircon, integrated analysis of tectonic evolution, magmatic activity and other palaeogeothermal analysis data. Results indicate that the palaeogeothermal gradient between the late-Paleozoic era and the medium-Mesozoic era is relatively low and the palaeogeothermal gradient in the late-Mesozoic is up to 5.56癈/100 m in the middle, and the values are relatively higher in the north and south margins of the basin, reaching over 8.00℃/100 m, which indicates that there was an anomalous tectonic thermal event in the thermal history of Qinshui Basin. This event happened in 110-140 Ma, and the main peak value was between 120 and 140 Ma. This anomalous tectonic thermal event is controlled by the strengthening thermal mobility of the lithosphere and magmatic intrusion. The maturity of the Permo-Carboniferous coal series mainly was controlled by this anomalous thermal field. The apatite fission track date of samples across the basin shows that a rapid tectonic uplifting with cooling existed 26.2-11.5 Ma ago and the upliftings in the north and south of the basin happened earlier than that in the middle. The Permo-Carboniferous strata had been completely annealed in the early 50 Ma, palaeotemperature over 125℃. Since then, especially from Oligocene-Miocene epoch, the strata which experienced large-scale tectonic upliftings with rapid cooling have been kept out of the annealing belt (70-125℃) in a relative low temperature environment. The late Mesozoic tectonic thermal event control hydrocarbon production peak (late Jurassic to early Cretaceous period) of Permo-Carboniferous strata in Qinshui Basin. When the strata experienced upliftings with rapid cooling since Oligocene-Miocene epoch, the hydrocarbon generation of coal series had stopped.

关键词： Qinshui Basin palaeogeothermal gradient tectonic thermal event cooling event fission track.

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Depositional age and tectonic environment of the Gouap banded iron formations from the Nyong group,SW Cameroon:Insights from isotopic,geochemical and geochronological studies of drillcore samples

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Geoscience Frontiers 2021年第2期12卷 549-572页

作者： Landry Soh Tamehe chongtao wei Sylvestre Ganno Carlos Alberto Rosiere Jean Paul Nzenti Chesther Gatse Ebotehouna Guanwen Lu Key Laboratory of CBM Resources and Reservoir Formation Process Chinese Ministry of EducationChina University of Mining and TechnologyXuzhouJiangsu221116China Department of Earth Sciences University of Yaounde IP.O.Box 812YaoundeCameroon Department of Geology Universidade Federal de Minas Gerais31270-901Belo HorizonteMinas GeraisBrazil School of Civil and Environmental Engineering University of Science and Technology BeijingBeijing 100083China

The discovery of the Gouap banded iron formations(BIFs)-hosted iron mineralization in the northwestern of the Nyong Group(Ntem Complex)in southwestern Cameroon provides unique insights into the geology of this *** this contribution,we firstly report detailed study of geochemistry,isotopic and geochronology of well preserved samples of the Gouap BIFs collected from diamond *** Gouap BIFs consist mainly of amphibole BIFs and amphibole-pyrite BIFs characterized by dominant Fe_(2)O_(3)+SiO_(2)contents and variable contents of CaO,MgO and SO_(3),consistent with the presence of amphibole,chlorite,epidote and pyrite,formed during amphibolite facies metamorphism and overprinted hydrothermal *** amphibole–pyrite BIFs are typically enriched in trace and rare earth elements(REE)compared to the amphibole BIFs,suggesting the influence of detrital materials as well as secondary hydrothermal *** Post Archean Australian Shale(PAAS)-normalized REE–Y profiles of the Gouap BIFs display positive La,Eu anomalies,weak negative Ce anomalies,indicating a mixture of low-temperature hydrothermal fluids and relatively oxic conditions probably under relative shallow *** present here the first isotopic data of BIFs within the Ntem ***δ^(30)Si_(NBS28)values of the quartz from the Gouap BIFs vary from-1.5‰to-0.3‰and from-0.8‰to-0.9‰for the amphibole BIFs and amphibole–pyrite BIFs,*** quartz hasδ^(18)OV-SMOW values of 6.8‰–9.5‰(amphibole BIFs)and 9.2‰–10.6‰(amphibole–pyrite BIFs).The magnetite from the Gouap BIFs showsδ^(18)O values ranging from-3.5‰to-1.8‰and from-3‰to-1.7‰for the amphibole BIFs and amphibole–pyrite BIFs,***,the pyrite grains in the amphibole–pyrite BIFs displayδ34S values of 1.1‰–1.8‰.All isotopic data of the Gouap BIFs confirm that they might have precipitated from low-temperature hydrothermal fluids with detrital input distant from the volcanic *** to their geochemical and isotop

关键词： Gouap Banded iron formations Isotope geochemistry Zircon geochronology Ryacian period Brasiliano-Congo orogeny

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