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Geochemical Characteristics and Origin of Natural Gases in the Qaidam Basin,china

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Acta Geologica Sinica(English Edition) 2003年第1期77卷 103-115页

作者： ZHANG Xiaobao, HU Yong, DUAN Yi, MA Liyuan, MENG Zifang, HE Peng,ZHOU Shixin and PENG Dehuastate key laboratory of Gas Geochemistry, Lanzhou institute of Geology, Chinese Academy ofSciences, Lanzhou, Gansu 730000 research institute of petroleum exploration and development, Qinghai petroleum Company,CNPC, Dunhuang, Gansu 736200 Chinese Acad Sci Lanzhou Inst Geol State Key Lab Gas Geochem Lanzhou 730000 Gansu Peoples R China Qinghai Petr Co Res Inst Petr Explorat & Dev CNPC Dunhuang 736200 Gansu Peoples R China

Sixty-five natural gas samples were collected from 19 oil-gasfields in theQaidam basin, china. The chemical composition and carbon isotope values of the samples weremeasured, and the geochemical characteristics and origin of the natural gases were studied. Thegases can be divided into biogenic gases, sapropelic oil-type gases, mixed type oil-type gases,coal-type gases and mixed gas. The delta^(13)C_1 values of the biogenic gases are very small and theC_2^+ contents of them are very low, ranging from -68.2 per thousand to -61 .8 per thousand and0.06 percent to 0.20 percent respectively. They have heavy delta D and delta^(13)C_(CO_2), showing aCO_2 reduction pathway. They ,are distributed in the East depression region and derived from theQuaternary source rocks. The sapropelic oil-type gases have small delta^(13)C_2 values and highC_2^+ ranging from -36.6 per thousand to -28.6 per thousand and from 33.01 percent to 47.15 percentrespectively. The mixed type oil-type gases have delta^(13)C_2 values and C_2^+ contents varyingfrom -28.6 per thousand to -24.8 per thousand and from 4.81 percent to 26.06 percent *** sapropelic oil-type gases and mixed type oil-type gases are associated with oil-type oils,distributed in the West depression region and derived from the Tertiary saltwater lacustrinesapropelic source rocks and humic source rocks respectively. The delta^(13)C_2 values of thecoal-type gases are extremely high and the C_2^+ contents are very low, changing from -23.3 perthousand to -12.5 per thousand and from 0.06 percent to 18.07 percent respectively. The coal-typegases in the Nanbaxian gasfield and the Lenghu oil-gasfields in the North fault block belt arederived from the Middle Jurassic coal-measures source rocks, whereas those in the West depressionregion are derived from the Tertiary saltwater lacustrine humic source rocks. Compared with someother basins in china, the natural gases there have obviously heavier delta^(13)C due to the heavierdelta^(1

关键词： natural gas geochemical characteristics origin Qaidam basin

A discussion on the upper limit of maturity for gas generation by marine kerogens and the utmost of gas generative potential:Taking the study on the Tarim Basin as an example

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Science Bulletin 2007年第S1期 125-132页

作者： CHEN JianPing1,2, ZHAO WenZhi1, XIAO ZhongYao3, ZHANG ShuiChang1,2, DENG ChunPing1,2, SUN YongGe4 & WANG ZhaoMing3 1 research institute of petroleum exploration & development, petrochina, beijing 100083, china 2 key Lab of petroleum Geochemistry, CNPC, beijing 100083, china 3 research institute of petroleum exploration & development, Tarim Oilfield Company, petrochina, Korla 841000, china 4 state key Lab of Organic Geochemistry, Guangzhou institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, china

The experimental data yielded by Rock-Eval pyrolysis, kerogen atomic H/C, Py-GC and gold-tube sealing thermal simulation on the marine Cambrian-Ordovician source rock from the Tarim Basin revealed that the upper limit of maturity for natural gas generation or the "deadline of gas generation" for marine types I and II kerogens is equal to 3.0% of vitrinite reflectance (Ro); while the "deadline of gas generation" for type III kerogens typically like coals is as high as 10% Ro. Thus, different organic matter has obviously different utmost maturities for gas generation. The mass-balance calculation by kerogen elements showed that when Ro>1.5%, the utmost amount of gas generation for the marine type II kerogen is less than 185 m3/t TOC, accounting for less than 30% of its total hydrocarbon generative potential; when Ro>2.0%, it becomes 110 m3/t TOC, less than 20% of the total hydrocarbon generative potential. The amount of the gas generative potential obtained by Rock-Eval is only around one tenth of the calculated value by the mass balance of kerogen elements at the same thermal evolutionary stage, while those by Py-GC and gold-tube sealing simulation are intervenient between the above two. The utmost of gas generative potential at the over 1.3% Ro stage is around 60―90 m3/t TOC, therefore, the amount of gas generation obtained by Rock-Eval is the minimum of gas generative potential, while that by the mass-balance calculation of kerogen elements is the maximum that the actual amount of gas generation should not exceed.

关键词： marine source rock kerogen maturity natural gas deadline of gas generation utmost of gas generative potential

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珠江口盆地储层特征

石油地球物理勘探 2011年第6期46卷 952-960,1012+834-835页

作者：王永凤王英民李冬徐强黄振凯中国石油大学(北京)地球科学学院北京102249 油气资源与探测国家重点实验室北京102249 中海石油研究中心北京100027 中国石油勘探开发研究院北京100083

早渐新世晚期(30Ma)南海运动后,珠江口盆地大部分进入浅水陆架区,由陆相环境向海相环境过渡,古近纪末(23.8Ma)白云运动后,随着海平面的不断上升,盆地整体进入海相沉积环境。珠江口盆地经历了不同的构造演化阶段,发育不同类型的储层,储... 详细信息

早渐新世晚期(30Ma)南海运动后,珠江口盆地大部分进入浅水陆架区,由陆相环境向海相环境过渡,古近纪末(23.8Ma)白云运动后,随着海平面的不断上升,盆地整体进入海相沉积环境。珠江口盆地经历了不同的构造演化阶段,发育不同类型的储层,储层主要发育在上部的晚渐新世—第四纪海陆交互相及海相沉积中。浅水区储层主要包括三角洲砂体、陆架砂脊、滨岸砂、生物礁及扇三角洲砂体沉积,其中由古珠江大河控制的陆架三角洲—滨岸体系及生物礁是已发现油田最主要的产层;深水区储层主要包括海底扇,陆架边缘三角洲,台缘斜坡扇沉积,其中低位的海底扇砂体和陆架边缘三角洲是深水区最具潜力的勘探目标。

关键词：珠江口盆地构造演化储层类型三角洲-滨岸海底扇陆架边缘三角洲

THE TERRESTRIAL TRIASSIC-JURASSIC BOUNDARY IN THE JUNGGAR BASIN,XINJIANG,NORTHWEST china——SUGGESTION ON GEOCHEMICAL,PALAEOBOTANICAL AND PALYNOLOGICAL EVIDENCES

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THE TERRESTRIAL TRIASSIC-JURASSIC BOUNDARY IN THE JUNGGAR BA...

developmental modes of the Neoproterozoic-Lower Paleozoic marine hydrocarbon source rocks in china

侏罗系界限及地质事件国际学术研讨会

作者： Shenghui DENG Yuanzheng LU research institute of petroleum exploration & development(RIPED) petrochina beijing 100083 china

＜正＞The terrestrial Triassic and Jurassic strata are successionally developed in some basins of china, of which the Junggar basin, Xinjiang, Northwest china is the representative one.

关键词： terrestrial strata Triassic-Jurassic boundary Junggar basin organic carbon isotope macroplant spore-pollen

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Science Bulletin 2007年第S1期 77-91页

作者： ZHANG BaoMin1, ZHANG ShuiChang1, BIAN LiZeng2, JIN ZhiJun3 & WANG DaRui1 1 research Center of petroleum Geology in research institute of petroleum exploration and development, petrochina, beijing 100083, china 2 Department of Earth Sciences, Nanjing University, Nanjing 210093, china 3 research institute of petroleum exploration and development, Sinopec, beijing 100083, china

Based on the researches on rock type, the mode of occurrence, diagnostic minerals and creatures, the sedimentary geochemistry and organic facies of Chinese marine source rocks from wells and outcrops, and on the research findings of developmental modes of foreign marine source rock, the authors consider that it is impossible to objectively make clear the formation mechanism of hydrocarbon source rock with high organic matter abundance by either single mode of preservation or high organic matter productivity. According to the Chinese geological features, the formation mechanism of the Neoproterozoic-Lower Paleozoic marine source rock is generalized into four modes, namely, thermal water activity-upwelling flow-anoxic; carbonate gentle slope-upwelling flow; xerothermic climate-brine euxinic milieu; and humid climate-retained euxinic milieu; as the Lower Cambrian undercompensation basin organic facies (the Tarim Basin, South china and southwestern margin of North china), carbonate gentle lime mud bound organic facies (the Upper Ordovician in Tazhong region of the Tarim Basin and the Lower Silurian in the Upper Yangtze Platform), the Middle Cambrian evaporation laggon organic facies (the Tarim Basin and the Upper Yangtze Platform), enclosed undercompensation terrigenous bay organic facies (the Middle-Upper Ordovician in the west of the Tarim Basin, the Lower Silurian Longmaxi Formation in the Upper Yangtze platform). Chinese marine sedimentations with lower organic matter abundance are generalized into two modes of consumption-dilution mode of open epicontinental sea and depletion-dilution mode of supercompensation basin.

关键词： marine source rock upwelling flow anoxic event thermal water activity xerothermic climate-brine euxinic humid climate-retained euxinic

Reservoir differences and formation mechanisms in the Ke-Bai overthrust belt,northwestern margin of the Junggar Basin,china

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petroleum Science 2010年第1期7卷 40-48页

作者： Zhu Xiaomin Zhu Shifa Xian Benzhong Chen Shuping Kuang Lichun Xue Xinke Xue Jingjing You Xincai state key laboratory of petroleum Resources and Prospecting China University of Petroleum Beijing 102249 China Faculty of Geoscience China University of Petroleum Beijing 102249 China research institute of petroleum exploration and development Xinjiang Oilfield Company CNPC Karamay Xinjiang 834000 China

There are some differences in reservoir quality of clastic rock between the hanging wall and the foot wall of the Ke-Bai overthrust belt, northwestern margin of the Junggar Basin, western china, which affect the efficient petroleum exploration in this highly mature exploration area. Based on a large number of thin-sections, cast thin-sections, and physical property analysis of cores, we systematically discuss the Permian-Jurassic reservoir differences between the hanging wall and the foot wall of the Ke- Bai overthrust fault from the aspects of structural evolution, time-space distribution of the depositional system, diagenesis characteristics, and reservoir quality and analyzed the reasons for the differences in reservoir properties. The overthrusting of the Ke-Bai fault directly results in different burial histories, diagenesis evolution, and porosity evolution between the hanging wall and the foot wall. The diflbrences of reservoir characteristics are mainly embodied in buried depth, grain size, sedimentary facies, diagenetic stage, and reservoir quality. The analysis results showed that burial history and depositional characteristics controlled by overthrusting are direct influencing factors of reservoir differences. Because of shallow burial depth of the hanging wall, the reservoir compaction is weak and primary pores are preserved well. The porosity of reservoir on the hanging wall is generally 10%-25%. The strata on the foot wall are deeply buried, and there are mainly mixed pores with the average porosity of 5%-20%. The favorable reservoir on the foot wall is generally developed near faults or in the channel sand bodies, which are usually dissolution development areas.

关键词： Junggar Basin overthrust belt reservoir differences formation mechanism

Late Early Jurassic Floras in the North of china and Their Palaeoclimate Implications

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Late Early Jurassic Floras in the North of China and Their P...

Simulated experiment evidences of the corrosion and reform actions of H2S to carbonate reservoirs:an example of Feixianguan Formation,east Sichuan

第八届国际侏罗系大会

作者： Shenghui Deng 1 Yuanzheng Lu 1 Guobin Fu 2 Ru Fan 1 Wenzhe Duan 1 1. state key laboratory of Enhanced Oil Recovery(research institute of petroleum exploration and development petrochina)beijing 100083 china 2. research institute of petroleum exploration and development of Turpan-Hami Oil Company petrochina Hami 839009 Xinjiang china

＜正＞The terrestrial upper Lower Jurassic strata are extremely developed in china, of which those in the South of china are chiefly composed of red beds,

关键词： Upper of the Lower Jurassic Flora Toarcian Palaeoclimate North of china

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Science Bulletin 2007年第S1期 178-183页

作者： MA YongSheng1, GUO TongLou1, ZHU GuangYou2, CAI XunYu1 & XIE ZengYe2 1 exploration Company, SINOPEC, beijing 100029, china 2 research institute of petroleum exploration and development, petrochina, beijing 100083, china

The reservoir of Feixianguan Formation of the Lower Triassic in the Sichuan Basin is the deepest buried carbonate reservoir in china, with developed secondary corrosion holes, high quantities carbonate reservoir, maximum effective carbonate reservoir thickness. Also Feixianguan gas reservoir has the highest quantities of H2S. research discovers that there are close relationships between the formation of reservoir and H2S. The mutual actions between acidity fluid and carbonate promoted the forming of secondary carbonate holes. Through the experiment of corrosion of the samples of Feixianguan carbonate reservoir in saturated aqueous solution of hydrogen sulfide, the porosity and permeability increased greatly, porosity increased 2% and permeability increased nearly two quantity degrees, also the density became light, which confirm the corrosion and reform actions of H2S to carbonate.

关键词： corrosion simulation high quantities reservoir mutual actions between acidity fluid and carbonate Feixianguan Formation H2S eastern Sichuan

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中国陆上天然气资源的特征及发展策略

石油学报 2004年第5期25卷 1-5页

作者：赵贤正赵政璋李景明李东旭石油大学北京102249 中国石油勘探与生产公司北京100011 中国石油勘探开发研究院廊坊分院河北廊坊065007

对中国陆上天然气资源的基本特征作了全面分析 ,其特征主要表现为 :①天然气勘探程度不高 ,资源相对丰富 ,主要集中分布于四个气区 ;②天然气成藏特点明显 ,类型差别较大 ;③目前天然气勘探进入大发现时期 ,天然气产量大幅度增长 ,储采... 详细信息

对中国陆上天然气资源的基本特征作了全面分析 ,其特征主要表现为 :①天然气勘探程度不高 ,资源相对丰富 ,主要集中分布于四个气区 ;②天然气成藏特点明显 ,类型差别较大 ;③目前天然气勘探进入大发现时期 ,天然气产量大幅度增长 ,储采比暂时较高。根据目前勘探开发状况 ,今后加快天然气发展的策略应是 :①突出重点 ,继续加强天然气勘探 ;②加强提高单井产能的工程技术攻关 ,降低开发成本 ;③转变开发理念 ,提高管理水平 ;④通过体制创新 ,提高开发效益。

关键词：天然气工业发展策略中国天然气资源储量复合圈闭岩性