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Determination of carbon isotopic composition of individual light hydrocarbons evolved from pyrolysis of source rocks by using GC-IRMS

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Chinese Science Bulletin 2000年第S1期45卷 7-10页

作者： GENG Ansong xiong yongqiang Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640China

The carbon isotopic composition of individual light hydrocarbons generated from source rocks that had been pyrolysed in vacuum glass tube were determined by using the GC-IRMS techniques. The results indicate that abundant CO2 in the pyrolysates has a remarkable effect on the determination of CH4δ13C. Running cryogenically with an initial temperature of -40℃ can effectively eliminate the effect. In addition, it conduces to measuring the δ13C of C2+ hydrocarbons by increasing the injection volume and/or absorbing CO2 with the solution of sodium hydroxide. The above measures will help to get the carbon isotopic composition of C1-C7 components, which is of great significance for gas/source rock correlation and for study on the genesis of natural gas.

关键词： pyrolysis light hydrocarbon carbon isotopic composition GC-IRMS.

Carbon isotopic compositions of individual terpenoids in heavy oils from Karamay oilfield

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Chinese Science Bulletin 1999年第3期44卷 256-259页

作者： yongqiang xiong Ansong Geng Deguang Liu Chinese Acad Sci Guangzhou Inst Geochem Canton 510640 Peoples R China Xinjiang Petr Adm Res Inst Explorat & Dev Karamay 834000 Peoples R China

The carbon isotopic compositions of individual terpenoids in the heavy oils from the Karamay oilfield were determined by using the method of enrichment of terpanes with molecular sieve 13X and GC-IRMS technique. The terpanes, selectively enriched from the biodegraded oils with molecular sieve 13X, can meet the demand of GO-IRMS analysis. The carbon isotopic compositions of the hopanoids (δ13C-31.7‰—-37.8‰) infer that their main source is probably non-methanotrophic bacteria,and that the depositional environment of source rocks is a strongly reductive, rapidly depositional, and closed-semi-closed saline lagoon.

关键词： GC-IRMS terpenoid molecular sieve 13X Karamav oilfield.

Decomposition Temperature of Cold Seep Carbonate and its Relationship with Delta Carbonate

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Acta Geologica Sinica(English Edition) 2016年第6期90卷 2271-2272页

作者： ZHAO Jing LIANG Qianyong LEI Rui xiong yongqiang Gas Hydrate Engineering Technology Center Guangzhou Marine Geological SurveyChina Geological Survey State Key Laboratory of Organic Geochemistry Guangzhou Institute of GeochemistryChinese Academy of Sciences Key Laboratory of Marine Mineral Resources Guangzhou Marine Geological SurveyMinistry of Land and Resources

Delta carbonate （Delta C, AC） method is a commonly- used surface geochemical exploration method for petroleum surveys. Delta C holds that light hydrocarbon gases leak into near-surface soils or sediments from underlying petroleum accumulations, then partly oxidized to CO2, resulting in a special carbonate precipitation, which is termed as Delta carbonate （△C）.

关键词： soil CCO Decomposition Temperature of Cold Seep Carbonate and its Relationship with Delta Carbonate

Mass balance calculation of the pyrolysates generated from marine crude oil:A prediction model of oil cracking gas resources based on solid bitumen in reservoir

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Chinese Science Bulletin 2007年第11期52卷 1532-1539页

作者： WANG TongShan GENG AnSong xiong yongqiang GENG XinHua State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

Oil cracking gas plays an important role in the resources of natural gas in the basins with high and over mature marine source rocks in China. The prediction of the oil cracking gas resources becomes nec-essary and urgent in the gas exploration in these basins. A marine crude oil sample was pyrolyzed using sealed gold tubes system. The pyrolysates including gas,liquid and solid were quantitatively analyzed. Based on the pyrolysis data and kinetic calculation,the yield correlativity among gas,liquid and solid products was regressed with high correlative coefficients to establish a prediction model suitable for the resource estimation of oil cracking gas. The verification formula for this model was also established on the principle of mass conservation. The affecting factors and the application precondi-tions of this prediction model were discussed. This model would enlighten and provide some new ideas for the resource assessment of natural gas in the high and over mature marine carbonate source rock areas in China. It is expected to be valuable in gas exploration.

关键词：高温分解实验石油天然气故障预测相互关系

The effect of volatile components in oil on evolutionary character- istics of diamondoids during oil thermal pyrolysis

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Science China Earth Sciences 2016年第2期59卷 362-370页

作者： FANG ChenChen xiong yongqiang LI Yun LIANG QianYong WANG TongShan LI YongXin Research Institute of Petroleum Exploration and Development Beijing 100083 China State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Guangzhou Marine Geological Survey Ministry of Land and Resource Guangzhou 510760 China

On the basis of the results of simulation experiments, now we better understand the contribution of high carbon number hydrocarbons to diamondoid generation during thermal pyrolysis of crude oil and its sub-fractions(saturated, aromatic, resin, and asphalene fractions). However, little is known about the effect of volatile components in oil on diamondoid generation and diamondoid indices due to the lack of attention to these components in experiments. In this study, the effect of volatile components in oil on diamondoid generation and maturity indices was investigated by the pyrolysis simulation experiments on a normal crude oil from the HD23 well of the Tarim Basin and its residual oil after artificial volatilization, combined with quantitative analysis of diamondoids. The results indicate that the volatile components(≤n C12) in oil have an obvious contribution to the generation of adamantanes, which occurs mainly in the early stage of oil cracking(Easy Ro<1.0%), and influences the variations in maturity indices of adamantanes; but they have no obvious effect on the generation and maturity indices of diamantanes. Therefore, some secondary alterations e.g., migration, gas washing, and biodegradation, which may result in the loss of light hydrocarbons in oil under actual geological conditions, could affect the identification of adamantanes generated during the late-stage cracking of crude oil, and further influence the practical application of adamantane indices.

关键词： Crude oil Volatile component Thermal pyrolysis Diamondoids Evolution characteristics

Thermal cracking of n-octodecane and its geochemical significance

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Chinese Science Bulletin 2004年第S1期49卷 79-83页

作者： yongqiang xiong Haizhu Zhang Xinhua Geng Ansong Geng Chinese Acad Sci State Key Lab Organ Geochem Guangzhou Inst Geochem Guangzhou 510640 Peoples R China

The mechanism of carbon isotopic fractionation for gaseous hydrocarbons is revealed by investigating the residual liquid hydrocarbons in laboratory pyrolysates of n-octodecane. The results indicate that cracking and polymerization in the relatively low temperatures and dispropor-tionation reactions leading to light hydrocarbons and pol-yaromatic hydrocarbons at high temperatures are probably causes for the carbon isotope reversal of gaseous hydrocarbons that is commonly observed in pyrolysis experiments. This study provides significant insight for quantitative modeling of natural gas δ13C values and aid in the identification and assessment of natural gases derived from oil cracking.

关键词： n-octodecane pyrolydsis experiment stable carbon isotope gaseous hydrocarbons residual liquid hydrocarbons.

Integration of LNG Regasification Process in Natural Gas-Fired Power System with Oxy-Fuel Combustion

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Journal of Thermal Science 2022年第5期31卷 1351-1366页

作者： LIU Rong xiong yongqiang KE Liying LIANG Jiacheng CHEN Dengjie ZHAO Zhongxing LI Yajun College of Chemistry and Materials Science Ji’nan UniversityGuangzhou510632China Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology Guangxi UniversityNanning530004China Key Lab of Heat Transfer Enhancement and Energy Conservation of the Ministry of Education South China University of TechnologyGuangzhou510640China

Oxy-fuel combustion power systems can utilize the cold energy released during the liquefied natural gas(LNG)regasification to reduce the power consumption of CO_(2) capture,but the specific LNG cold energy consumption of CO_(2) capture is still too *** recover more CO_(2) with the limited LNG cold energy at a low energy cost,a novel natural gas-fired oxy-fuel power system with the cascade utilization of LNG cold energy is proposed in this work,where the LNG cold energy could be sequentially utilized in the air separation unit and the CO_(2) recovery *** new system is evaluated with the Aspen Plus *** results show that the net electrical efficiency and the specific primary energy consumption for CO_(2) avoided(SPECCA)of the new system are comparable to those of the chemical looping combustion cycle,and superior to those of the conventional O_(2)/CO_(2) ***,the specific LNG needed for CO_(2) avoided(SLNCC)of the new system is more than 67.2%lower than the existing oxy-fuel power systems utilizing the LNG cold ***,it is found that the O_(2) purity of 97.0 mol.%and the CO_(2) capture ratio of 97.0%are optimal conditions,because the SPECCA,the specific exergy consumption for CO_(2) avoided(SECCA)and the SLNCC are at the minimum of 1.87 GJLHV⋅t_(CO_(2))^(−1),2.60GJ⋅t_(CO_(2))^(−1) and 1.88tLNG⋅t_(CO_(2))^(−1),***,the net electrical efficiency and the exergy efficiency of the new system reach 51.51%and 49.23%,respectively.

关键词： oxy-fuel combustion CO_(2)capture LNG cold energy efficiency

Kinetic study of the hydrocarbon generation from marine carbonate source rocks characterization of products of gas and liquid hydrocarbon

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Chinese Science Bulletin 2006年第23期51卷 2885-2891页

作者： GENG Xinhua GENG Ansong xiong yongqiang LIU Jinzhong ZHANG Haizu ZHAO Qingfang The State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China

The kinetic parameters of hydrocarbon generation from the marine carbonate source rocks were determined and calibrated through kinetic simulating experiment. The kinetic parameters of hydrocarbon generation then were extrapolated to geological condition by using the relative software. The result shows that gaseous hydrocarbons (C_1, C_2, C_3, C_(4-5)) were generated in condition of 150℃

关键词：烃相生动力学碳酸盐运动模拟地质情况

Cross-layer optimization in ultra wideband networks

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Science in China(Series F) 2007年第5期50卷 760-770页

作者： WU Qi BI JingPing GUO ZiHua xiong yongqiang ZHANG Qian LI ZhongCheng Institute of Computing Technology Chinese Academy of Sciences Beijing 100080 China Microsoft Research Asia Beijing 100080 China Lab of Network Science Institute of Computing Technology Chinese Academy of Sciences Beijing 100080 China

Ultra wideband （UWB） network brings both chance and challenge to personal area wireless communications. Compared with other IEEE 802 small range wireless protocols （such as WLAN and Bluetooth）, UWB has both extremely high bandwidth （up to 480 Mbpa） and low radiation. Moreover, the structured MAC layer of UWB is the fundamental difference to WLAN. The top one is that only when two UWB devices belong to the same piconet can they communicate with each other directly, which means that we must jointly consider topology formation and routing when deploying UWB networks because the interaction between routing and topology formation makes separate optimization ineffective. This paper tries to optimize UWB network from a cross-layer point of view. Specifically, given device spatial distribution and traffic requirement, we want to form piconets and determine routing jointly, to maximize the overall throughput. We formulate the problem of joint optimization to mixed-integer programming and give a practical lower bound that is very close to the theoretical upper bound in our simulation. Furthermore, our lower bound is much better than an algorithm that only considers topology formation in UWB networks.

关键词： ultra wideband medium access control cross-layer design topology formation piconet