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The genetic environmental transformation mechanism of coal and oil shale deposits in eastern China’s continental fault basins and the developmental characteristics of the area’s symbiotic assemblages——taking Huangxian Basin as an example 被引量:6
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作者 Dong-Dong Wang Zeng-Xue Li +2 位作者 Hai-Yan Liu Da-Wei Lyu Guo-Qi Dong 《Petroleum Science》 SCIE CAS CSCD 2019年第3期469-491,共23页
Coal and oil shale are two common sedimentary energy sources which are often symbiotically developed in M esozoic- Cenozoic continental fault basins. However, the mechanisms and characteristics of the symbiotic develo... Coal and oil shale are two common sedimentary energy sources which are often symbiotically developed in M esozoic- Cenozoic continental fault basins. However, the mechanisms and characteristics of the symbiotic development are not yet clearly known. In this research study, the typical continental fault basins of eastern China were chosen as examples for the purpose of conducting an examination of the coal and oil shale symbiotic assemblage types, genetic environmental differences, and transformation mechanisms, as well as the development and occurrence characteristics o f different assemblage types. Through a large number of investigations, systematic experimental testing, and sequence stratigraphy studies, the following conclusions were obtained:(1) There were five types of coal and oil shale symbiotic assemblages observed in the continental fault basins,(2) The development of coal and oil shale deposits requires a warm and humid climate, stable structure, abundant organic matter supply, a certain water depth, and a lower terrestrial source debris supply. The observed differences were that the water depth conditions were diversified in the study area, as well as the sources, types, and content of the organic matter.(3) The rapid transformations of the coal and oil shale genetic environments were mainly controlled by the tectonic settings and climatic conditions, which were determined to control the changes in the water depths, salinity,redox conditions, and lake productivity of the genetic environments. Also, in the symbiotic assemblages, genetic environment changes had induced the development of oil shale deposits, which gradually evolved into coal genetic environments.(4) In the isochronous sequence stratigraphic framework of the coal and oil shale symbiotic assemblages, the lake expansion system tracts (EST) were determined to be the most beneficial to the growth o f all the types of assemblages and were characterized by more assemblage development phases and smaller bed thicknesses. From the early to the late stages of the EST, and from the lakesides to lake centers, the thicknesses of the coal seams in the symbiotic assemblages showed trends of thinning, while the thicknesses of the oil shale deposits exhibited increasing trends. The early stages of high stand system tracts were found to be beneficial to the development of the symbiotic assemblages of coal seams overlying the oil shale. This tract type generally presented large bed thicknesses and distribution ranges. The low stand system tract and the late high stand system tract were determined to be unconducive to the development of the symbiotic assemblages. 展开更多
关键词 coal and oil shale symbiotic ASSEMBLAGES Genetic environments Conversion mechanism Sequence stratigraphic framework Occurrence CHARACTERISTICS CONTINENTAL fault BASIN
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Analysis of the Strategies of the 'Replacement of Coal and Oil' with Natural Gas in Sichuan Province
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作者 Yin Ping Shen Xilin 《China Oil & Gas》 CAS 2018年第4期42-49,共8页
Sichuan Province boasts rich clean energy such as natural gas and hydroelectricity. In order to realize the blueprint of a beautiful China, it is both necessary and feasible for Sichuan Province to "replace coal and ... Sichuan Province boasts rich clean energy such as natural gas and hydroelectricity. In order to realize the blueprint of a beautiful China, it is both necessary and feasible for Sichuan Province to "replace coal and oil" with natural gas. Based on the actual situation of Sichuan Province, through research and investigation, rational thinking and summarization, this paper analyzes the current demand for energy supply in Sichuan, defines the development goals and ideas concerning Sichuan's 'replacement of coal and oil" with natural gas, examines the action plan related to such replacement and puts forward relevant policies and suggestions. 展开更多
关键词 Natural gas Replacement of coal and oil Action plan
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Geological characteristics and co-exploration and co-production methods of Upper Permian Longtan coal measure gas in Yangmeishu Syncline, Western Guizhou Province, China 被引量:8
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作者 Cai-qin Bi Jia-qiang Zhang +6 位作者 Yan-sheng Shan Zhi-fang Hu Fu-guo Wang Huan-peng Chi Yue Tang Yuan Yuan Ya-ran Liu 《China Geology》 2020年第1期38-51,共14页
Coal measure gas(also known as coal-bearing unconventional gas)is the key field and development direction of unconventional natural gas in recent years.The exploration and evaluation of coal measure gas(coalbed methan... Coal measure gas(also known as coal-bearing unconventional gas)is the key field and development direction of unconventional natural gas in recent years.The exploration and evaluation of coal measure gas(coalbed methane,coal shale gas and coal measure tight sandstone gas)from single coalbed methane has greatly expanded the field and space of resource evaluation,which is of positive significance for realizing the comprehensive utilization of coal resources,maximizing the benefits and promoting the innovation of oil and gas geological theory and technological advances in exploration and development.For the first time,in Yangmeishu Syncline of Western Guizhou Province,the public welfare coalbed methane geological survey project of China Geological Survey has been carried out a systematic geological survey of coal measure gas for the Upper Permian Longtan Formation,identified the geological conditions of coal measure gas and found high quality resources.The total geological resource quantity of coalbed methane and coal shale gas is 51.423×109 m3 and the geological resource abundance is up to 566×106 m3/km2.In this area,the coal measures are characterized by many layers of minable coal seams,large total thickness,thin to the medium thickness of the single layer,good gas-bearing property of coal seams and coal measure mudstone and sandstone,good reservoir physical property and high-pressure coefficient.According to the principle of combination of high quality and similarity of key parameters of the coal reservoir,the most favorable intervals are No.5-2,No.7 and No.13-2 coal seam in Well YMC1.And the pilot tests are carried out on coal seams and roof silty mudstone,such as staged perforation,increasing hydraulic fracturing scale and"three gas"production.The high and stable industrial gas flow with a daily gas output of more than 4000 m3 has been obtained,which has realized the breakthrough in the geological survey of coal measure gas in Southwest China.Based on the above investigation results,the geological characteristics of coal measure gas in the multi-thin-coal-seam-developed area and the coexploration and co-production methods,such as the optimization method of favorable intervals,the highefficiency fracturing and reservoir reconstruction method of coal measures,and the"three gas"drainage and production system,are systematically summarized in this paper.It will provide a reference for efficient exploration and development of coal measure gas in similar geological conditions in China. 展开更多
关键词 coal measure gas Reservoir characteristics Favorable interval optimization Reservoir fracturing reconstruction coal measures"three gas"drainage oil and gas exploration enginerreing Upper Permian Longtan Formation Yangmeishu Syncline Western Guizhou Prov
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Whole petroleum system in Jurassic coal measures of Taibei Sag in Tuha Basin,NW China
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作者 ZHI Dongming LI Jianzhong +6 位作者 YANG Fan CHEN Xuan WU Chao WANG Bo ZHANG Hua HU Jun JIN Jikun 《Petroleum Exploration and Development》 SCIE 2024年第3期519-534,共16页
Based on the latest results of near-source exploration in the Middle and Lower Jurassic of the Tuha Basin,a new understanding of the source rocks,reservoir conditions,and source-reservoir-cap rock combinations of the ... Based on the latest results of near-source exploration in the Middle and Lower Jurassic of the Tuha Basin,a new understanding of the source rocks,reservoir conditions,and source-reservoir-cap rock combinations of the Jurassic Shuixigou Group in the Taibei Sag is established using the concept of the whole petroleum system,and the coal-measure whole petroleum system is analyzed thoroughly.The results are obtained in three aspects.First,the coal-measure source rocks of the Badaowan Formation and Xishanyao Formation and the argillaceous source rocks of the Sangonghe Formation in the Shuixigou Group exhibit the characteristics of long-term hydrocarbon generation,multiple hydrocarbon generation peaks,and simultaneous oil and gas generation,providing sufficient oil and gas sources for the whole petroleum system in the Jurassic coal-bearing basin.Second,multi-phase shallow braided river delta–shallow lacustrine deposits contribute multiple types of reservoirs,e.g.sandstone,tight sandstone,shale and coal rock,in slope and depression areas,providing effective storage space for the petroleum reservoir formation in coal-measure strata.Third,three phases of hydrocarbon charging and structural evolution,as well as effective configuration of multiple types of reservoirs,result in the sequential accumulation of conventional-unconventional hydrocarbons.From high structural positions to depression,there are conventional structural and structural-lithological reservoirs far from the source,low-saturation structural-lithological reservoirs near the source,and tight sandstone gas,coal rock gas and shale oil accumulations within the source.Typically,the tight sandstone gas and coal rock gas are the key options for further exploration,and the shale oil and gas in the depression area is worth of more attention.The new understanding of the whole petroleum system in the coal measures could further enrich and improve the geological theory of the whole petroleum system,and provide new ideas for the overall exploration of oil and gas resources in the Tuha Basin. 展开更多
关键词 Tuha Basin Taibei Sag Middle and Lower Jurassic whole petroleum system coal measure tight oil and gas coal rock gas shale oil
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Distribution and genesis of mercury in natural gas of large coal derived gas fields in China
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作者 LI Jian HAN Zhongxi +2 位作者 YAN Qituan WANG Shuying GE Shouguo 《Petroleum Exploration and Development》 2019年第3期463-470,共8页
The mercury content in natural gas samples from more than 500 gas wells in eight large gas bearing basins of China was tested, mercury release experiments on two coal samples from different areas were conducted, and t... The mercury content in natural gas samples from more than 500 gas wells in eight large gas bearing basins of China was tested, mercury release experiments on two coal samples from different areas were conducted, and the mercury content of 11 coal samples from different gas wells of Ordos Basin was tested. The mercury distribution of the coal derived gas has three features: The first is that mercury content of coal derived gas is generally much higher than that of oil derived gas, the second is that the coal derived gases from different fields vary widely in mercury content, the third is that the mercury content in coal derived gas increases with the increase of production layer depth. Mercury in coal derived natural gas mainly originates from the source rock. Besides three evidences, namely, coal derived gas mercury content is much higher than that of oil derived gas, mercury content of gas with high carbon dioxide content decreases with the increase of carbon dioxide content, and the coal bearing strata have the material base to generate natural gas with high mercury content, the pyrolysis experiment of two coal samples show that coal can produce natural gas with high mercury content during the process of thermal evolution. The mercury content of coal derived natural gas is controlled mainly by the temperature of source rock and the sulfur environment of reservoir. According to lithospheric material cycling process and oil-gas formation process, the formation of mercury in coal derived gas can be divided into four stages, transportation and deposition, shallow burial, deep burial, and preservation and destruction. 展开更多
关键词 China coal DERIVED gas MERCURY gas source rock oil DERIVED gas gas GENESIS
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煤油气共生矿井顶板油气赋存特征及防治措施研究
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作者 薛海涛 王祥 许志龙 《石化技术》 CAS 2024年第9期185-186,共2页
为了提高煤油气共生矿井油气灾害治理的科学性,以富县矿区为例,采用钻探取芯、物探识别、分析化验等多种方法,研究了采掘工作面煤层顶板油型气赋存特征,并探讨了顶板油型气富集的主控因素。结果表明油气主要赋存于煤层顶板3套砂体中,油... 为了提高煤油气共生矿井油气灾害治理的科学性,以富县矿区为例,采用钻探取芯、物探识别、分析化验等多种方法,研究了采掘工作面煤层顶板油型气赋存特征,并探讨了顶板油型气富集的主控因素。结果表明油气主要赋存于煤层顶板3套砂体中,油气富集受到沉积相带、构造鼻隆与厚层砂体的共同控制,建议加强油型气综合探查技术、油型气灾害预测预报技术、油型气综合抽采技术和智能化矿井建设等方面的研究。 展开更多
关键词 煤油气共生矿井 煤层顶板 富县矿区 油气赋存规律
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Approach and potential of replacing oil and natural gas with coal in China 被引量:4
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作者 Junjie LI Yajun TIAN +4 位作者 Xiaohui YAN Jingdong YANG Yonggang WANG Wenqiang XU Kechang XIE 《Frontiers in Energy》 SCIE CSCD 2020年第2期419-431,共13页
China’s fossil energy is characterized by an abundance of coal and a relative lack of oil and natural gas.Developing a strategy in which coal can replace oil and natural gas is,therefore,a necessary and practical app... China’s fossil energy is characterized by an abundance of coal and a relative lack of oil and natural gas.Developing a strategy in which coal can replace oil and natural gas is,therefore,a necessary and practical approach to easing the excessive external dependence on oil and natural gas.Based on the perspective of energy security,this paper proposes a technical framework for defining the substitution of oil and natural gas with coal in China.In this framework,three substitution classifications and 11 industrialized technical routes are reviewed.Then,three scenarios(namely,the cautious scenario,baseline scenario,and positive scenario)are developed to estimate the potential of this strategy for 2020 and 2030.The results indicate that oil and natural gas replaced by coal will reach 67 to 81 Mt and 8.7 to 14.3 Gm^3 in 2020 and reach 93 to 138 Mt and 32.3 to 47.3 Gm^3 in 2030,respectively.By implementing this strategy,China’s external dependence on oil,natural gas,and primary energy is expected to be curbed at approximately 70%,40%,and 20%by 2030,respectively.This paper also demonstrates how coal,as a substitute for oil and natural gas,can contribute to carbon and pollution reduction and economic cost savings.It suggests a new direction for the development of the global coal industry and provides a crucial reference for energy transformation in China and other countries with similar energy situations. 展开更多
关键词 coal replacing oil and natural gas energy security external dependence energy strategy China
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Geological conditions of coal and gas(oil)-bearingbasins in China 被引量:2
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作者 WANG Tingbin 《Science China Earth Sciences》 SCIE EI CAS 2005年第4期454-466,共13页
There are various types of coal basins in China. Indosinian movement can be re- garded as their evolutionary limit, and the basins can be divided into two developmental stages, three structural patterns and two sedime... There are various types of coal basins in China. Indosinian movement can be re- garded as their evolutionary limit, and the basins can be divided into two developmental stages, three structural patterns and two sedimentary environments. However, only those coal measure strata that have been deeply buried in the earth are possible to be converted into coal and gas (oil)-bearing basins. Among which, only part of the coal measures possess the essential geo- logical conditions to the formation of commercial humic oil. However, humic gas will be the major exploration target for natural gas in China. Among various coal basins, foreland basins have the best prospect for humic gas. Rift (faulted) basins accumulate the most abundance of humic gas, and are most favorable to generate humic oil. Craton basins have relatively low abundance of humic gas, but the evolution is rather great. The three kinds of coal basins mentioned above constitute China’s three primary accumulation areas of humic gas: western, central and offshore areas. The major basins for humic gas field exploration include Tarim, Ordos, Sichuan, East China Sea and Yingqiong basins. 展开更多
关键词 coal basin conversion gas(oil)-bearing basin GEOLOGICAL condition.
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On the connotation, challenge and significance of China’s “energy independence” strategy 被引量:7
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作者 ZOU Caineng PAN Songqi ZHAO Qun 《Petroleum Exploration and Development》 2020年第2期449-462,共14页
The world’s energy is in the "third major transformation period" from fossil energy to new energy, and all countries in the world have formulated energy development strategies. Through advanced deployment, ... The world’s energy is in the "third major transformation period" from fossil energy to new energy, and all countries in the world have formulated energy development strategies. Through advanced deployment, the United States is about to achieve "energy independence" relying on "unconventional oil and gas revolution". China’s energy development is faced with four challenges:(1) The population base and economic development scale determine the "totally huge amount" of energy consumption;(2) the "coal rich but oil and gas insufficient" resource structure determines the "unclean" energy consuming structure;(3) the increasing dependence on imported oil and gas determines the "unsafe" energy supply;and(4) the unconventional oil and gas endowment makes it impossible to achieve energy independence by copying the American model. From the perspective of the world energy trend and the unique situation of China’s energy, we put forward a "three-step" strategy for China to achieve "energy independence": From 2020 to 2035, "energy supply security" will be addressed by "cleaning coal, stabilizing oil and gas production and vigorously developing new alternative energy";from 2035 to 2050, the vision of "production independence" will be realized by relying on "domestic production and overseas oil and gas mining rights";from 2050 to 2100, "intelligent energy and new energy" will help China realize "energy independence". The two important signs of China’s "energy independence" are that domestic production accounts for more than 90% of the domestic consumption and clean energy production accounts for more than 70%, and energy security realizes "independence and self-control" and "long-term security". The strategic significance of "energy independence" is to ensure national energy security, drive the development of relevant major industries, achieve energy management reform, and implement the environmental protection goal of zero carbon emissions. The "energy independence" of China is a strategic mission, it might be fulfilled in the future with the growth of the state’s power, even when the domestic energy production does not catch up with the domestic consumption. Perhaps the world’s new technological revolution will exceed expectations, and China’s "energy independence" dream will eventually come true. 展开更多
关键词 energy independence energy revolution intelligent energy coal unconventional oil and gas new energy energy long march
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Life cycle assessment and economic analysis of HFC-134a production from natural gas compared with oil-based and coal-based production
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作者 Suisui Zhang Gang Li +3 位作者 Boyang Bai Luyao Qiang Xiaoxun Ma Jingying Li 《Frontiers of Chemical Science and Engineering》 SCIE EI CSCD 2022年第12期1713-1725,共13页
China is the largest producer and consumer of HFC-134a(1,1,1,2-tetrafluoroethane)in the world.Coal-based route is mainly adopted to produce HFC-134a,which suffers from large waste and CO_(2) emissions.Natural gas is a... China is the largest producer and consumer of HFC-134a(1,1,1,2-tetrafluoroethane)in the world.Coal-based route is mainly adopted to produce HFC-134a,which suffers from large waste and CO_(2) emissions.Natural gas is a low-carbon and clean energy resource,and no research has been found on the environment and economy of producing HFC-134a from natural gas.In this study,CML 2001 method was used to carry out the life cycle assessment of natural gas(partial oxidation)-based and natural gas(plasma cracking)-based routes(abbreviated as gas(O)-based and gas(P)-based routes,respectively),and their environmental performances were compared with coal-based and oil-based routes.Meanwhile,considering that China is vigorously promoting the transformation of energy structure,and the application of electric heating equipment to replace fossil-based heating equipment in industrial field,which has a great impact on the environmental performance of the production processes,the authors conducted a scenario analysis.The results showed that the gas(O)-based route had the most favourable environmental benefits.However,the gas(P)-based route had the highest potential for reducing environmental burdens,and its environmental benefit was the most favourable in scenario 2050.Additionally,the economic performance of the gas(P)-based route was significantly better than that of gas(O)-based and coal-based routes. 展开更多
关键词 life cycle assessment economic performance HFC-134A natural gas oil coal
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Status and Prospect of CTL and SNG Industry
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作者 Kong Lingfeng Zhu Xingshan Zhan Enqiang 《China Oil & Gas》 CAS 2018年第1期9-16,共8页
Since the beginning of this century, revolutionary progress has been made in the understanding of resources and in the mining technologies of the oil and gas industry. Advances in petroleum engineering technology repr... Since the beginning of this century, revolutionary progress has been made in the understanding of resources and in the mining technologies of the oil and gas industry. Advances in petroleum engineering technology represented by horizontal wells and large-scale fracturing have promoted the scale development of low-grade and unconventional oil and gas resources. After the rapid growth of natural gas production in China for more than 10 consecutive years, the replacement of conventional natural gas resources has been weak and unconventional natural gas has become the major force for increasing production. Coal based SNG(synthetic natural gas) has also become a major competitor in the domestic market. The development of CTL(coal-toliquids) and SNG industries has brought coal resources into the oil and gas product market, expanding the concept of traditional oil and gas resources. The continuous improvement of petroleum engineering technology has promoted the development of deep underground coal gasification technology, which has given economic value to the huge amount of deep coal resources that are unable to be exploited by underground mining, and provides a tremendous resource guarantee for the sustainable development of the traditional oil and gas industry. A preliminary calculation shows that deep underground coal gasification has a competitive advantage in cost compared with high-cost, low-grade, unconventional gas and coal-based natural gas. Deep underground coal gasification is a typical cross-disciplinary and cross-sectoral sophisticated technology. Domestic oil and gas enterprises have dominant advantages in the engineering technology of this field. Further technical integration innovation and multi-industry joint research are needed to eventually realize the commercial application of this deep underground coal gasification technology. 展开更多
关键词 Unconventional oil and gas Converted oil and gas CTL SNG Deep underground coal gasification Conceptual INNOVATION Technology integration INNOVATION coal cavern gas storage
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Theory, Technology and Practice of Unconventional Petroleum Geology 被引量:1
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作者 Caineng Zou Zhi Yang +17 位作者 Guosheng Zhang Rukai Zhu Shizhen Tao Xuanjun Yuan Lianhua Hou Dazhong Dong Qiulin Guo Yan Song Qiquan Ran Zhen Qiu Songtao Wu Feng Ma Bin Bai Lan Wang Bo Xiong Songqi Pan Hanlin Liu Xiaoni Wang 《Journal of Earth Science》 SCIE CAS CSCD 2023年第4期951-965,共15页
0 INTRODUCTION The breakthroughs in unconventional petroleum have a great impact on world petroleum industry and innovation in petroleum geology(Dou et al,2022;Jia,2017;Zou et al.,2015b,2014a;Yerkin,2012;Pollastro,200... 0 INTRODUCTION The breakthroughs in unconventional petroleum have a great impact on world petroleum industry and innovation in petroleum geology(Dou et al,2022;Jia,2017;Zou et al.,2015b,2014a;Yerkin,2012;Pollastro,2007;Schmoker,1995).The exploration and development evolution from conventional petroleum to unconventional petroleum and more and more frequent industrial activities of exploring petroleum inside sources kitchen have deepened theoretical understanding of unconventional petroleum geology and promoted technical research and development(Jia et al.,2021,2017;Jin et al.,2021;Zhao W Z et al.,2020;Ma Y S et al.,2018,2012;Zou et al.,2018b,2016,2009;Dai et al.,2012).We have introduced and extended the theory of continuous hydrocarbon accumulation since 2008 and published several papers/books(in Chinese and English)with respect to unconventional petroleum geology since 2009,basically forming the theoretical framework for this discipline(Yang et al.,2022a,2021a,2019a,,2015a;Zou et al.,2019c,2017b,2014a,,2013a).In this paper,we present the background of unconventional petroleum geology,review the latest theoretical and technological progress in unconventional petroleum geology,introduce relevant thinking and practices in China,and explore the pathway of unconventional petroleum revolution and multi-energy coordinated development in super energy basins,hopefully to promote the unconventional petroleum geology and industry development. 展开更多
关键词 unconventional petroleum geology conventional-unconventional petroleum geology source rock oil and gas oil and gas in source rock stratum fine-grained sediment microscale to nanoscale pore throat continuous hydrocarbon accumulation artificial hydrocarbon reservoir exploring petroleum inside source kitchen shale revolution coal rock revolution chemical transformation within source super energy basin.
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Analyzing the Share Composition of C02 Emissions in Asian Countries
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作者 Helen Cabalu Julian Inchauspe Paul Koshy 《Journal of Energy and Power Engineering》 2013年第8期1448-1456,共9页
This paper is concerned with the fossil fuel composition of carbon emissions in 10 selected Asian countries. It assesses how economic development may affect this composition through various channels. This paper contri... This paper is concerned with the fossil fuel composition of carbon emissions in 10 selected Asian countries. It assesses how economic development may affect this composition through various channels. This paper contributes to the debate on the EKC (environmental Kuznets curve) puzzle, which hypothesizes an inverted U-shaped relationship between per capita income and pollution. The paper examines the EKC hypothesis in an empirical analysis of channels that may allow for this effect. In particular, a specific subset of this general paradigm is investigated using a fractional multinomial logit model to assess how indicators associated with economic development and energy prices affect carbon emissions from coal relative to those of natural gas and oil. 展开更多
关键词 ASIA energy carbon dioxide emissions C02 natural gas coal oil.
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Experimental study and evaluation on hydrocarbon generation of macerals 被引量:2
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作者 LIU Dehan ZHANG Huizhi +4 位作者 DAI Jinxing SHENG Guoying XIAO Xianming SUN Yongge SENG Jiagui 《Chinese Science Bulletin》 SCIE EI CAS 2000年第14期1270-1276,共7页
Some typical coal and maceral samples are selected for oil and gas-generatingsystematic thermal simulation experiments, Rock-Eval, GC and GC-MS analyses. Results cause productivity curves of extracts and gaseous, ligh... Some typical coal and maceral samples are selected for oil and gas-generatingsystematic thermal simulation experiments, Rock-Eval, GC and GC-MS analyses. Results cause productivity curves of extracts and gaseous, light, liquid as well as total hydrocarbon. Effects of macerals and maturation on hydrocarbon productivities and compositions are synthetically discussed. Evaluation indexes and plan on coal-generated oil and gas in bituminous coal rank are suggested according to the data from experiments and analyses. 展开更多
关键词 coal MACERAL simulation experiment coal-generated oil and gas EVALUATION on coal-generated hydrocarbon.
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