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Bainiuchang super-large silver-polymetallic ore deposit related to granitic magmatism in Mengzi, Yunnan

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Journal of Central South University of Technology 2007年第4期14卷 568-574页

作者：刘继顺张洪培欧阳玉飞张彩华 School of geoscience and Environmental Engineering Central South University Mengzi Minning and Metallurgy Co. ltd. Mengzi County

Bainiuchang silver-polymetallic ore deposit is located in the southeast Yunnan tin-polymetallic metallogenic *** probable reserves and inferred resources of the deposit are of 6 470 t Ag and 1.10 Mt Pb and 1.72 Mt Zn and 86 kt *** of the deposit occur in clastic-carbonate rocks of Tianpeng Formation and Longha Formation of the middle Cambrian System above the Bainiuchang concealed granite of the late Yanshan *** concealed granite has the characteristics of tin-bearing *** of the mineralization elements Sn,Cu,Zn,Pb,Ag and Sb is high in the granitic *** isotope data of the metal sulphides indicate that most sulphur is derived from the *** ores are similar in rare earth element(REE)patterns to the granitic *** granitic magma activity results in ore-bearing *** of the Middle Cambrian System above the concealed intrusion suffer from skarnization,hornfelsing,marbleization,siliconizing and *** mineralization elements Sn,Cu,Zn,Pb,Ag and Sb successively appear from the top of the granite to surrounding *** evidences indicate that the granitic magmatism is the principal mineralization *** opinion that the south Bainiuchang ore field and the north Awei ore block are tin and copper potential exploration areas was put forward and was verified by drilling tests.

关键词： Bainiuchang super-large silver-polymetallic deposit granite granitic-porphyry tin ore

Characteristics of Hydrogen-rich Coals in Southern China:Implications from Organic Geochemistry and Carbon Isotopic Compositions

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Acta Geologica Sinica(English Edition) 2022年第1期96卷 309-320页

作者： LIN Yuhan WANG Shaoqing YANG Zongda ZHAO Yungang YANG Yi College of geoscience and Surveying Engineering China University of Mining and Technology(Beijing)Beijing 100083China Wanbao Mining ltd. Beijing 100053China

The organic geochemical characteristics of hydrogen-rich coal in southern China were investigated synthetically through organic geochemistry and carbon isotope *** results showed that the hydrogen contents of the test samples were more than 5.0% and the H/C atomic ratios were between *** were found to be composed mostly of Type Ⅱ-Ⅲ℃ kerogen,consistent with good hydrocarbon-generation *** R_(o)(0.54-1.10%)and T_(max)(430-453℃)values imply that the hydrogen-rich coals were in low maturity to mature *** carbon isotopic ratios(δ^(13)C_(org))of the samples used varied from −24.5‰ to −23.4‰,the barkinite content ranging from 13.9% to 83.3%,indicating a predominantly terrestrial origin with marine influence during coal *** organic geochemical parameters showed corresponding changes as the hydrogen content increased from 5.0% to 7.0%,however,the source inputs changed significantly when hydrogen content was greater than 6.0%.Terrestrial higher plants gradually become predominant within the coal-forming materials,whereas this dominant position is not apparent at lower hydrogen contents,which is attributable to the strong seawater effect during the hydrogen-rich coal formation process.

关键词： hydrogen-rich coal carbon isotope geochemistry Rock-Eval GC GC-MS

Investigation and measurement of old building response to the overlapped shield tunnel of multiple schemes in the sandy cobble stratum

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Underground Space 2024年第2期15卷 260-274页

作者： Xue Li Aopeng Geng School of geoscience and Technology Southwest Petroleum UniversityChengduSichuan 610500China China Railway Construction Bridge Engineering Bureau Group Co. Ltd.Tianjin 300300China

Ground movements due to tunneling are becoming increasingly critical as buildings are located around construction *** study proposes a new combined reinforcement method using a foundation grouting oblique pipe *** former improves the bearing capacity of the subsoil,and the latter blocks the transmission of soil deformation,which weakens the influence of construction during overlapped tunnel *** on this new method,a case study of the shield tunneling response to an old building in Line 6 of China’s Chengdu Metro is ***,three-dimensional numerical models without reinforcement,traditional foundation grouting reinforcement,and the new combined reinforcement schemes were *** numerical simulation performance was verified using a set of field instrumentation data,which demonstrated that the old building response to the overlapped tunnels was under control,and the maximum deformation,angular distortion,and principal tensile strain of the building were 5.25 mm,5.1010–6 rad/m,and 0.0081%,*** with the traditional reinforcement scheme,the deformation,angular distortion,and principal tensile strain in the combined reinforcement scheme were reduced by 54.78%,71.02%,and 70.22%,*** results have important implications for the design and construction of shield tunnels and their response to old buildings.

关键词： Overlapped tunnels Reinforcement schemes Under-crossing Old building Numerical simulation

Fluid inclusion characteristics of Longmenshan copper-polymetallic deposit in Yueshan,Anhui Province,China

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Journal of Central South University 2012年第9期19卷 2627-2633页

作者：刘忠法邵拥军疏志明彭南海谢友良张宇 School of geoscience and Info-Physics Central South University Tongling Nonferrous Metals Grou p Co. Ltd.

The types, composition and physico-chemical conditions of primary fluid inclusions were researched. The results show that the primary fluid inclusions contain vapor and liquid phase type （Type I）, daughter mineral-bearing type （Type II） and pure liquid phase type （Type III）. The compositions of vapor are mainly H20 and CO2 with a tiny amounts of CH4 and H2; the liquid phase mainly contains Mg2＋, Ca2＋, Na＋, K＋, CI- and SO]-, and w（Na＋）/w（K＋）〉l; the homogenization temperatures of the primary fluid inclusions can be divided into 190-250 ℃, 250-340 ℃ and 360-420 ℃, corresponding to the salinities of 4%-9%, 9%-14%, and 14%-20.43% （NaC1 equivalent mass fraction）, respectively. The mineralization process can be divided into three episodes： the silicatization stage, the quartz-sulfide stage, and the carbonatization stage, and all of them are associated with the ore-forming hydrothermal fluid activity. The origin of the hydrothermal fluid is from magrnatic water mainly, and later it mixes with the groundwater and meteoric water, which lead to the decrease of temperature and salinity. The decrease of salinity, temperature and pressure are the main causes of the metallogenic elements unloading and enriching in the favorable position.

关键词： fluid inclusions metallogenic physico-chemical condition ore-forming fluid Longmenshan copper-polymetallic deposit

Fault Systems and their Control of Deep Gas Accumulations in Xujiaweizi Area

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Acta Geologica Sinica(English Edition) 2012年第6期86卷 1547-1558页

作者： SUN Yonghe KANG Lin BAI Haifeng FU Xiaofei HU Ming geoscience College Northeast Petroleum University Zhenhua Oil Co.ltd.

A study of faults and their control of deep gas accumulations has been made on the basis of dividing fault systems in the Xujiaweizi area. The study indicates two sets of fault systems are developed vertically in the Xujiaweizi area, including a lower fault system and an upper fault system. Formed in the period of the Huoshiling Formation to Yingcheng Formation, the lower fault system consists of five fault systems including Xuxi strike-slip extensional fault system, NE-trending extensional fault system, near-EW-trending regulating fault system, Xuzhong strike-slip fault system and Xudong strike-slip fault system. Formed in the period of Qingshankou Formation to Yaojia Formation, the upper fault system was affected mainly by the boundary conditions of the lower fault system, and thus plenty of muiti-directionally distributed dense fault zones were formed in the T2 reflection horizon. The Xuxi fault controlled the formation and distribution of Shahezi coal-measure source rocks, and Xuzhong and Xndong faults controlled the formation and distribution of volcanic reservoirs of Y1 Member and Y3 Member, respectively. In the forming period of the upper fault system, the Xuzhong fault was of successive strong activities and directly connected gas source rock reservoirs and volcanic reservoirs, so it is a strongly-charged direct gas source fault. The volcanic reservoir development zones of good physical properties that may be found near the Xuzhong fault are the favorable target zones for the next exploration of deep gas accumulations in Xujiaweizi area.

关键词： deep gas accumulation fault system gas source fault volcanic reservoir Xujiaweizi

Moscow Dialogues: Discussions on Red Philosophy

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清华大学学报(自然科学版) 1934年第2期 529-534页

作者： Julius F. Hecker,张季同 London chapman and Hall ltd.

Sedimentary elements,evolutions and controlling factors of the Miocene channel system:a case study of the deep-water Taranaki Basin in New Zealand

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Acta Oceanologica Sinica 2023年第11期42卷 44-58页

作者： Guangxu Wang Wei Wu Changsong Lin Quan Li Xiaoming Zhao Yongsheng Zhou Weiqing Liu Shiqin Liang Institute of Resources and Environment Henan Polytechnic UniversityJiaozuo 454003China School of Ocean Science China University of GeoscienceBeijing 100083China Institute of Exploration Technology CNOOC International Ltd.Beijing 100028China School of geoscience and Technology Southwest Petroleum UniversityChengdu 610500China

Deep-water channel systems are important petroleum reservoirs,and many have been discovered *** deep-water channel sedimentary elements and evolution is helpful for deep-sea petroleum exploration and *** on high-resolution 3D seismic data,the Miocene channel system in the deep-water Taranaki Basin,New Zealand,was analyzed by using seismic interpretation techniques such as interlayer attribute extraction and strata *** channel system was divided into five composite channels(CC-I to CC-V)according to four secondary level channel boundaries,and sedimentary elements such as channels,slump deposits,inner levees,mass transport deposits,and hemipelagic drape deposits were identified in the channel *** morphological characteristics of several composite channels exhibited stark variances,and the overall morphology of the composite channels changed from relatively straight to highly sinuous to relatively *** evolution of the composite channels involved a gradual and repeated process of erosion and filling,and the composite channels could be divided into three evolutionary stages:initial erosion-filling,later erosion-filling(multistage),and channel *** middle Miocene channel system may have formed as a consequence of combined regional tectonic activity and global climatic change,and its intricate morphological alterations may have been influenced by the channel's ability to self-regulate and gravity flow *** studying the sedimentary evolution of a large-scale deep-water channel system in the Taranaki Basin during the Oligocene-Miocene,which transitioned from a passive margin to plate convergence,it can be understood how tectonic activity affected the channel and can also provide a theoretical reference for the evolution of the deepwater channels in areas with similar tectonic conversion environments around the world.

关键词： deep-water channel system channel geomorphology sedimentary evolution climate and region tectonic activities deep-water Taranaki Basin

Fault Development and Tectonic Evolution in the Lishu Depression， Songliao Basin， NE China

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Journal of Earth Science 2023年

作者： Shengmin Su Youlu Jiang Yuhu Liu CNOOC Research Institute ltd. School of geoscience， China University of Petroleum (East China) Sinopec Northeast Oil and Gas Company

The Lishu Depression， located in the southeastern region of the Songliao Basin， exhibits diverse fault types and complex tectonic evolution characteristics， however， the slipping direction and activity duration of strike-slip faults， as well as the overall tectonic evolution process remain unknown. This study applied a method for determining the slipping direction and activity duration of strike-slip faults， and reconstructed the tectonic evolution process of the Lishu Depression using balanced cross sections. The determination of the slipping direction of strike-slip faults was based on the analysis of the dislocation distance of a specific set of strata on two fault walls within the anticline zone， and the activity duration of strike-slip faults was defined by the sedimentary period of the strata cut by faults， and the variation characteristics of formation thickness. The slipping direction and activity duration of the strike-slip faults in the study area suggest that the depression experienced a left-lateral strike regime during the sedimentary periods of 135–131.8 and 124.5–112 Ma. However， during the sedimentary periods of the Yingcheng Formation (131.8–124.5 Ma)， the region was influenced by a right-lateral strike background. The study area experienced a continuous process of extension from 145.6 to 124.5 Ma， and compression commenced from the depositional period of the Nenjiang Formation (88.5 Ma)， as shown by negative values of the extension rate. The findings of this study hold significant theoretical implications for the identification of the slipping direction and distance of strike-slip faults within comparable depressions. Moreover， these results have practical implications for further hydrocarbon exploration in the Lishu Depression.

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Prediction Model of Coal Reservoir Pressure and its Implication for the Law of Coal Reservoir Depressurization

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Acta Geologica Sinica(English Edition) 2019年第3期93卷 692-703页

作者： YAN Xinlu ZHANG Songhang TANG Shuheng LI Zhongcheng WANG Kaifeng YI Yongxiang DANG Feng HU Qiuping School of Energy and Resources China University of GeoscienceBeijing 100083China MOE Key Lab of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism China University of GeoscienceBeijing 100083China Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering Beijing 100083China China United Coalbed Methane Corporation ltd. Beijing 100011China

The main methods of coalbed methane(CBM)development are drainage and depressurization,and a precise prediction of coal reservoir pressure is thus crucial for the evaluation of reservoir potentials and the formulation of reasonable development *** work established a new reservoir pressure prediction model based on the material balance equation(MBE)of coal reservoir,which considers the self-regulating effects of coal reservoirs and the dynamic change of equivalent drainage area(EDA).According to the proposed model,the reservoir pressure can be predicted based on reservoir condition data and the actual production data of a single *** with traditional reservoir pressure prediction models which regard EDA as a fixed value,the proposed model can better predict the average pressure of ***,orthogonal experiments were designed to evaluate the sensitivity of reservoir parameters on the reservoir pressure prediction results of this proposed *** results show that the saturation of irreducible water is the most sensitive parameter,followed by Langmuir volume and reservoir porosity,and Langmuir pressure is the least sensitive *** addition,the pressure drop of reservoirs is negatively correlated with the saturation of irreducible water and the Langmuir volume,while it is positively correlated with *** work analyzed the reservoir pressure drop characteristics of the CBM wells in the Shizhuangnan Block of the Qinshui Basin,and the results show that the CBM reservoir depressurization can be divided into three types,i.e.,rapidly drop type,medium-term stability type,and slowly drop *** drainage features of wells were reasonably interpreted based on the comprehensive analysis of the reservoir depressurization type;the latter was coupled to the corresponding permeability dynamic change characteristics,eventually proving the applicability of the proposed model.

关键词： coalbed methane pressure prediction equivalent drainage area influencing factors pressure drop types Qinshui Basin