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Experiment of the ^(40)Ar/^(39)Ar dating of diagenetic illite in gas reservoirs

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Chinese Science Bulletin 2004年第S1期49卷 89-93页

作者： WANG Longzhang, DAI Tongmo & PENG Ping’an State key laboratory of Organic {2., Guangzhou Institute of {2., CAS, Guangzhou 510640, China Faculty of Resources, Chinese University of Geosciences, Wuhan 430074, China 1. State key laboratory of Organic {2. Guangzhou Institute of Geochemistry CAS 510640 Guangzhou China 2. Faculty of Resources Chinese University of Geosciences 430074 Wuhan China

40Ar/39Ar dating of diagenetic illite has been performed to investigate gas reservoirs in the Sulige gas Field of the northern Ordos Basin. A series of technical challenges were confronted, including illite purification, Ar recoil loss, and separation of diagenetic illite from detrital illite. Mineral growth ages for diagenetic illite were obtained by this experiment, from which the age of gas emplacement was deduced to be later than 169 Ma.

关键词： 40Ar/39Ar dating diagenetic illite purification of clay minerals Ar recoil loss time of gas emplacement.

Evidence from carbon isotope measurements for biological origins of individual long-chain n-alkanes in sediments from the Nansha Sea,China

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Chinese Science Bulletin 2002年第7期47卷 578-581页

作者： DUAN Yi & WANG ZhipingState key laboratory of {2. geochemistry, Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000, China Institute of Environmental Science, Beijing Normal University, Beijing 100875, China 1. State key laboratory of {2. geochemistry Lanzhou Institute of Geology Chinese Academy of Sciences 730000 Lanzhou China 2. Institute of Environmental Science Beijing Normal University 100875 Beijing China

Carbon isotopes are measured for individual long-chain n-alkanes in sediments from the Nansha Sea. The features of carbon isotopic compositions of individual n-alkanes and their origins are studied. The results show that the long-chain n-alkanes have a light carbon isotopic composition and a genetic feature of mixing sources, and low-latitude higher plants and microbes are considered to be their main end member sources. Based on the abundances and carbon isotopic compositions of individual n-alkanes, the fractional contributions of the two end member sources to individual n-alkanes are quantitatively calculated by using a mixing model. The obtained data indicate that the fractional contributions of the two biological sources are different in the three samples. A trend is that the contribution of microbes increases with the depth. These results provide the theory basis and quantitatively studied method for carbon isotopic applied research of individual n-alkanes.

关键词： modern marine sediment individual n-alkane carbon isotopic composition biological source.

Enhancing Geological Understanding and Identifying Gold Anomalies in the Ailaoshan Orogen

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Acta Geologica Sinica(English Edition) 2024年第2期98卷 441-453页

作者： ZHAO Shiyu YANG Lin SONG Yiwei DONG Yuntao FENG Lihao LI Huajian WU Junyu WANG Qingfei State key laboratory of Geological Processes and Mineral Resources China University of GeosciencesBeijing 100083China Xi’an Center of Mineral Resources Survey China Geological SurveyXi’an 710010China Yunnan Gold Mining Industry Group Kunming 650299China Jiangxi Provincial key laboratory of Genesis and Prospect for Strategic Minerals East China University of TechnologyNanchang 330013China Frontiers Science Center for Deep-time Digital Earth China University of Geosciences(Beijing)Beijing 100083China

The Ailaoshan Orogen in the southeastern Tibet Plateau,situated between the Yangtze and Simao blocks,underwent a complex structural,magmatic,and metamorphic evolution resulting in different tectonic subzones with varying structural lineaments and elemental *** elements can conceal or reduce anomalies due to the mutual effect between different anomaly *** the whole zone into subzones based on tectonic settings,ore cluster areas,or sample catchment basins(Scb),geochemical and structural anomalies associated with gold(Au)mineralization have been identified utilizing mean plus twice standard deviations(Mean+2.TD),factor analysis(FA),concentration-area(CA)modeling of stream sediment geochemical data,and lineament density in both the Ailaoshan Orogen and the individual *** FA in the divided 98 Scbs with 6 Scbs containing Au deposits can roughly ascertain unknown rock types,identify specific element associations of known rocks and discern the porphyry or skarn-type Au *** with methods of Mean+2.TD and C-A model of data in the whole orogen,which mistake the anomalies as background or act the background as anomalies,the combined methods of FA and C-A in the separate subzones or Scbs works well in regional metallogenic potential *** of lineament densities with a 10-km circle diameter is not suitable to locate Au deposits because of the delineated large areas of medium-high lineament *** contrast,the use of circle diameters of 1.3 km or 1.7 km in the ore cluster scale delineates areas with a higher concentration of lineament density,consistent with the locations of known Au *** analyzing the map of faults and Au anomalies,two potential prospecting targets,Scbs 1 and 63 with a sandstone as a potential host rock for Au,have been identified in the Ailaoshan *** use of combined methods in the divided subzones proved to be more effective in improving geological understanding and identifying

关键词： minerology geochemistry gold stream sediment sample catchment basin concentration-area model lineament density Ailaoshan Orogen

A New Model for the Genesis of Natural gases——Multi-source Overlap, Multi-stage Continuity, TypeControlled by Main Source and Nomenclature by Main Stage (Ⅱ)——Multi-stage Continuity and Nomenclature by Main Stage

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Science China Chemistry 1994年第3期37卷 494-501页

作者：徐永昌沈平 State key laboratory of {2. geochemistry Lanzhou Institute of Geology Academia Sinica Lanzhou 730000 PRC

The generation of natural gases involves several stages and the various stages are of continuous transition. This is another feature of natural gas generation. The term 'multi-stage' is relative mainly to oil-generating threshold value and liquid window. The evolution of organic matter is affected by different epigene agencies and natural gases differing in geochemical properties such as biogenic gas (bacterial gas), thermocatalytic gas and pyrolytic gas could be produced at different stages of the evolution of organic matter. The proposal of bio-thermocatalytic transitional-zone gas presents a pattern of mutual linking and continuous transition of natural gases originated at different *** the genetic classification of natural gases, the nomenclature of a certain gas is based mainly on the epigene agency which is responsible for its formation, for example, biogenic gas, pyrolytic gas. That is the 'nomenclature by the main stage' described in this study. On account of the continuity of gas generation, if a sedimentary basin has not undergone obvious uplifting and denudation, natural gases formed at different stages would constitute overlap gas reservoirs, i. e. accumulative gas reservoirs. If in the process of gas generation, the sedimentary basin has undergone uplifting and denudation followed by re-descending, gases generated under such geological settings would be partly scattered. This is called the instantaneous preservation. All this would exert the influence on the geochemical properties of natural gases in the natural gas reservoirs formed under the conditions described above. The use of the new model described in this paper to study the questionable mechanisms of genesis of some gas reservoirs would yield more satisfactory results.

关键词： genesis of natural gases multi-stage continuity.

Molecular geochemical characteristics of source rock in faulted lacustrine basin:A case study of the Lishu Fault Depression in southern Songliao Basin,China

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Chinese Journal Of geochemistry 2013年第4期32卷 413-419页

作者： LI Hongbo ZHANG Min CHEN Xiaohui Department of geochemistry Yangtze University key laboratory of Exploration Technologies for Oil and {2. Resources Ministry of EducationYangtze University

Terrestrial faulted lacustrine basin is considered as a favorable place for the development of source rocks,especially the fault basins in eastern *** on molecular composition study of saturated and aromatic hydrocarbons in the extracts of source rocks of the Yingcheng and Shahezi formations in the Lishu Fault Depression,it is revealed that the extracts of source rocks are provided with low ratio of Pr/Ph,low content of C2. tetracyclic terpanes,high content of tricyclic terpanes and gammacerane,relatively high content of C2. steranes in the sag belt and its periphery;relatively high ratio of Pr/Ph,relatively high content of tetracyclic terpanes and gammacerane,low content of C2. steranes and obvious advantages of C2. steranes in its gentle slope belt;with high ratio of Pr/Ph,high content of C19,C2. tricyclic and C2. tetracyclic terpanes,very low content of gammacerane and C2. steranes,and high content of C2. steranes in the edge of fault *** to the organic matter input and sedimentary environment,three types of source rocks have been established,which,respectively,are the mode of mixing organic matter input in deep and semi-deep lake,the advantage of terrigenous input in shallow lake and terrigenous input in shore-shallow *** first mode is supposed to generate oil and gas,while the second one tends to generate *** distribution characteristics of oil and gas in the Lishu Fault Depression are very likely to be controlled by hydrocarbon generating characteristic of different source rock types.

关键词：梨树断陷断陷湖盆中国东部分子组成烃源岩松辽盆地南部地球化学特征伽马蜡烷

Source Identification of Sulfur in Uncultivated Surface Soils from Four Chinese Provinces

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Pedosphere 2015年第1期25卷 140-149页

作者： XIAO Hua-Yun LI Nan LIU Cong-Qiang State key laboratory of Environmental {2. Institute of Geochemistry Chinese Academy of Sciences

The analysis of stable isotopes of sulfur(δ34S) is a useful tool for identifying sources of sulfur in soils. Concentrations and sulfur(S)isotopes of water-soluble sulfate(WSS), adsorbed sulfate(AS), residual sulfur(RS), and total sulfur(TS) in uncultivated surface soils of four Chinese provinces were systematically analyzed for identifying sources of S in the soils. Green and healthy mosses(Haplocladium microphyllum) were sampled as bioindicators. The mean WSS concentration(2..8 ± 2..4 mg kg-1) in the surface soils was lower than those of AS(101.4 ± 57.0 mg kg-1) and RS(381.5 ± 2.6.7 mg kg-1). The mean δ34S values of WSS and AS were very similar(about2.0‰), lower than those of RS(8.0‰) and TS(6.1‰). A significant linear correlation was found between the δ34S values of AS and WWS(y = 1.0002.- 0.0557, P < 0.0001), indicating that sulfate adsorption in the soils did not markedly fractionate S. All S species in the soils of Guizhou Province were characterized by the lowest δ34S values, consistent with the most34S-depleted rainwater sulfate reported at Guiyang of Guizhou Province. The δ34S values of sulfate in mosses and rainwater previously reported were significantly linearly correlated with those of both WWS and AS in surface soils, suggesting that atmospheric S input was an important source for soil WSS and AS. However, there were no significant correlations between isotopic composition of rainwater sulfate and RS or *** slopes of all these significant linear correlations(soil/rainwater or soil/moss isotopic ratio) were 0.4–0.6, indicating that inorganic sulfate in the surface soils should be a result of mixing of deposited atmospheric sulfate with a more34S-depleted sulfate component possibly from mineralization of RS.

关键词： adsorbed sulfate atmospheric input bioindicators isotopic composition moss residual sulfur water-soluble sulfate

Experimental study on the interaction between peat,lignite and germanium-bearing solution at low temperature

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Science China Earth Sciences 2005年第9期48卷 1411-1417页

作者： QI Huawen1,2. HU Ruizhong1 & QI Liang1 1. key laboratory of Ore Deposit {2., Chinese Academy of Sciences, Guiyang 550002. China 2. Department of Earth Science, Nanjing University, Nanjing 2.0093, China 1. key laboratory of Ore Deposit {2. Chinese Academy of Sciences 550002 Guiyang China 2. Department of Earth Science Nanjing University 210093 Nanjing Chin

The interaction between peat, lignite and germanium(Ge)-bearing solution with an initial Ge concentration of 5 mg/L was studied at 2.―100℃ and at pH 2.96―12.08. The results show that the apparent transfer ratios of peat and lignite for Ge in the solution were positively correlated with temperature in acid environment (initial pH=2.96), and the ratios (up to 86.5%) of lignite were obviously higher than those (up to 58.5%) of peat, but the organic transfer ratios of lignite were lower than those of peat. The activation energy values for interaction between peat, lignite and Ge-bearing solution are 30.96 and 15.67 kJmol?1, respectively. The strong acid (initial pH=2.96) and the strong alkaline (initial pH=12.08) environment contribute to the transfer of Ge in the solution. At 4

关键词： low temperature, peat, lignite, Ge4+, complexation.

Thermogravimetry-differential thermal analysis coupled with chromatography as a thermal simulation experimental method and its application to gaseous hydrocarbons from different source rocks

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Chinese Journal Of geochemistry 2005年第3期24卷 289-296页

作者：史基安赵欣王琪刘全有 key laboratory of {2. geochemistry Lanzhou Institute of Geology Chinese Academy of Sciences Lanzhou 730000 China

In this paper a thermogravimetry-differential thermal analysis method coupled with chromatography (TG-DTA-GC) has been adopted to simulate the generation of gaseous hydrocarbons from different hydrocarbon source rocks such as coals, mudstones, and carbonate rocks with different maturities. The temperature programming for thermal simulation experiment is 2.℃/min from ambient temperature to 700℃. As viewed from the quantities and composition of generated gaseous hydrocarbons at different temperatures, it is shown that low-mature coal has experienced the strongest exothermic reaction and the highest loss of weight in which the first exothermic peak is relatively low. Low-mature coal samples have stronger capability of generating gaseous hydrocarbons than high-mature samples. The amounts and composition of gaseous hydrocarbons generated are closely related not only to the abundance of organic carbon in source rocks, but also to the type of kerogen in the source rocks, and their thermal maturity. In the present highly mature and over-mature rock samples organic carbon, probably, has already been exhausted, so the production of gaseous hydrocarbons in large amounts is impossible. The contents of heavy components in gaseous hydrocarbons from the source rocks containing type-Ⅰand -Ⅱ kerogens are generally high; those of light components such as methane and ethane in gaseous hydrocarbons from the source rocks with Ⅲ-type kerogens are high as well. In the course of thermal simulation of carbonate rock samples, large amounts of gaseous hydrocarbons were produced in a high temperature range.

关键词：碳氢化合物岩石热量分析法煤矿地球化学物理方法

The consideration and choice on exploiting energy source

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Chinese Science Bulletin 1999年第18期44卷 1717-1728页

作者： WANG XianbinState key laboratory of {2. geochemistry, Lanzhou Institute of Geology, Chinese Academy of Sciences , Lanzhou 730000, China State key laboratory of {2. geochemistry Lanzhou Institute of Geology Chinese Academy of Sciences Lanxhou China

A problem of petroleum energy crisis will probably be faced in the late 2.st century. It is impossible to discover the giant oil fields again based on the traditional knowledge and theory of petroleum geology. From the global development point of view as well as the situation in China, the five choices of energy source in the future are to ( i ) extend the field of exploration in conventional petroleum and natural gas source, and exploit oil-gas source in ocean and

关键词： energy sources in the future unconventional gas coal hydrogen controllable nuclear fusion 3He source on the moon.