Pyrite-hydrocarbon Interaction under Hydrothermal Conditions: an Alternative Origin of H2S and Organic Sulfur Compounds in Sedimentary Environments     

DING Kangle  MEI Ping  LUO Yue 《《地质学报》英文版》2016,90(6):2133-2148

Sulfate rocks and organic sulfur from sedimentary organic matter are conventionally assumed as the original sulfur sources for hydrogen sulfide(H_2S) in oil and gas reservoirs. However,a few recent experiments preliminarily indicate that the association of pyrite and hydrocarbons may also have implications for H_2S generation,in which water effects and natural controls on the evolution of pyrite sulfur into OSCs and H_2S have not been evaluated. In this study,laboratory experiments were conducted from 200 to 450° C to investigate chemical interactions between pyrite and hydrocarbons under hydrothermal conditions. Based on the experimental results,preliminary mechanism and geochemical implications were tentatively discussed. Results of the experiments showed that decomposition of pyrite produced H_2S and thiophenes at as low as 330°C in the presence of water and n-pentane. High concentrations of H_2S were generated above 450°C under closed pyrolysis conditions no matter whether there is water in the designed experiments. However,much more organic sulfur compounds(OSCs) were formed in the hydrous pyrolysis than in anhydrous pyrolysis. Generally,most of sulfur liberated from pyrite at elevated temperatures was converted to H_2S. Water was beneficial to breakdown of pyrite and to decomposition of alkanes into olefins but not essential to formation of large amounts of H_2S,given the main hydrogen source derived from hydrocarbons. In addition,cracking of pyrite in the presence of 1-octene under hydrous conditions was found to proceed at 200°C,producing thiols and alkyl sulfides. Unsaturated hydrocarbons would be more reactive intermediates involved in the breakdown of pyrite than alkanes. The geochemistry of OSCs is actually controlled by various geochemical factors such as thermal maturity and the carbon chain length of the alkanes. This study indicates that the scale of H_2S gas generated in deep buried carbonate reservoirs via interactions between pyrite and natural gas should be much smaller than that of thermochemical sulfate reduction(TSR) due to the scarcity of pyrite in carbonate reservoirs and the limited amount of long-chained hydrocarbons in natural gas. Nevertheless,in some cases,OSCs and/or low contents of H_2S found in deep buried reservoirs may be associated with the deposited pyrite-bearing rock and organic matters(hydrocarbons),which still needs further investigation.  相似文献   

Preliminary Studies of Speleothem in Central Asia     

TAN Liangcheng  SONG Yougui  CAI Yanjun  AN Zhisheng  Rustam OROZBAEV  Yunus MAMADJANOV  Lawrence R. EDWARDS  CHENG Hai  LI Dong  LI Yue 《《地质学报》英文版》2016,90(6):2279-2280

正Objective The Westerlies is important in linking the Northern high latitude,North Atlantic and East Asian monsoon.The location and intensity of the Westerly jet can not only control the climate of central Asia(including northwest arid China),but also significantly influence the climate of the East Asian monsoon region.However,it remains  相似文献   

Redox Evolution of the Lithospheric Mantle beneath the North China Craton     

WANG Jian  SONG Yue  Keiko HATTORI 《《地质学报》英文版》2016,90(4):1539-1540

正Objective The North China Craton(NCC)is a large Archean craton with a long geological history,yet very few studies have been carried out on the evolution of the redox conditions of its underlying mantle.Oxidation state of the mantle is critical in controlling the formation of metallic mineral deposits because metals can be readily released from the mantle to partial melt under oxidized conditions.  相似文献   

The fundamental performance of FAST with 19-beam receiver at L band     

Peng Jiang  Ning-Yu Tang  Li-Gang Hou  Meng-Ting Liu  Marko Krco  Lei Qian  Jing-Hai Sun  Tao-Chung Ching  Bin Liu  Yan Duan  You-Ling Yue  Heng-Qian Gan  Rui Yao  Hui Li  Gao-Feng Pan  Dong-Jun Yu  Hong-Fei Liu  Di Li  Bo Peng  Jun Yan  FAST Collaboration 《天文和天体物理学研究(英文版)》2020,(5):65-92

The Five-hundred-meter Aperture Spherical radio Telescope(FAST) has passed national acceptance and finished one pilot cycle of ‘Shared-Risk’ observations. It will start formal operation soon. In this context, this paper describes testing results of key fundamental parameters for FAST, aiming to provide basic support for observation and data reduction of FAST for scientific researchers. The 19-beam receiver covering 1.05–1.45 GHz was utilized for most of these observations. The fluctuation in electronic gain of the system is better than 1% over 3.5 hours, enabling enough stability for observations. Pointing accuracy,aperture efficiency and system temperature are three key parameters for FAST. The measured standard deviation of pointing accuracy is 7.9′′, which satisfies the initial design of FAST. When zenith angle is less than 26.4°, the aperture efficiency and system temperature around 1.4 GHz are ~0.63 and less than 24 K for central beam, respectively. The sensitivity and stability of the 19-beam backend are confirmed to satisfy expectation by spectral HI observations toward NGC 672 and polarization observations toward 3 C 286. The performance allows FAST to take sensitive observations for various scientific goals, from studies of pulsars to galaxy evolution.  相似文献   

Structural Control of the Linglong Metamorphic Core Complex on Gold Mineralization of the Jiaodong Peninsula, East China: Low Temperature Thermochronologic Constraints     

YANG Liqiang  DENG Jun  WANG Zhongliang  ZHANG Liang  YUAN Wanming  LIU Yue  ZHANG Ruizhong 《地质学报》2014,88(Z2):1708-1709

Please refer to the attachment(s) for more details.  相似文献   

Design and optimization of cross bow-tie dipole feed with cavity for FAST     

Jing-Long Yu  You-Ling Yue  Jian-Bin Li 《天文和天体物理学研究(英文版)》2020,(5):132-136

A cross bow-tie dipole feed with cavity and symmetrical E and H plane pattern is presented for the Five hundred-meter Aperture Spherical radio Telescope(FAST).In this paper we describe the design,optimization and simulation results of a wide-band cross dipole feed with cavity covering the frequency range from 300 MHz to 600 MHz for FAST.The main goals of our design are to ensure that,(1)we cover the octave bandwidth,(2)the feed has symmetrical E and H plane pattern,and(3)the physical dimension is suitable for mounting it in the reserved position of the FAST feed cabin.The initial results indicate that we have met most of our design goals.This kind of feed had been equipped with the multi-beam receiver to carry out observation on the platform of FAST cabin.  相似文献   

Petrogeochemistry and Geochronology of Gold-Hosting Monzogranites in the Xincheng Gold Deposit, Jiaodong Peninsula, China: Implication for Gold Mineralization     

LIU Yue  YANG Liqiang  WANG Zhongliang  ZHANG Liang  ZHANG Chao  WANG Xudong 《地质学报》2014,88(Z2):1646-1647

Please refer to the attachment(s) for more details.  相似文献   

Repeated Wildfires in the Middle Jurassic Xishanyao Formation (Aalenian and Bajocian Ages) in Northwestern China     

HOU Haihai  SHAO Longyi  LIANG Guodong  TANG Yue  ZHANG Huajie  ZHANG Jiaqiang 《《地质学报》英文版》2022,96(5):1752-1763

The coal-bearing strata in the southern Junggar Basin in northwestern China have recently attracted the attention of coal geologists. Its abundance of coal resources is of great interest as there is a potential of unlocking details about the palaeoclimatic information. Coal deposits have the capacity to record wildfire events, even those with inefficient combustions. To characterize wildfire events and palaeoclimatic history of the Middle Jurassic Xishanyao Formation (Aalenian and Bajocian ages), 22 coal samples from borehole cores and coal mines in the southern Junggar Basin were collected and their macerals were analyzed. The results indicated that fusinite and semi-fusinite were the dominant components of inertinite with proportions of 35.27% and 54.67%, respectively. The presence of inertinite is an indicator that wildfires occurred at the time of peat land development, and the widespread occurrence suggests large scale wildfires during the Middle Jurassic. This study proposes a new parameter for the evaluation of wildfire features by combining burning frequency and burning temperature. The comprehensive evaluation index (CEI) was influenced by the lacustrine basin level and ancient plant types from a sequence framework. During the Middle Jurassic, most wildfires were surface fires with low level and ground fire with high level. High oxygen levels were estimated in the lower, middle, and upper members of the Xishanyao Formation with corresponding to 26.78%, 24.55%, and 23.55%, respectively. The high oxygen levels would be the primary cause of repeated wildfires in the Middle Jurassic. These results are helpful for understanding palaeoclimatic changes in the Middle Jurassic.  相似文献   

Observational Study on the Supercooled Fog Droplet Spectrum Distribution and Icing Accumulation Mechanism in Lushan,Southeast China     

Tianshu WANG  Shengjie NIU  Jingjing Lü  Yue ZHOU 《大气科学进展》2019,36(1):29-40

A fog monitor, hotplate total precipitation sensor, weather identifier and visibility sensor, ultrasonic wind speed meter,an icing gradient observation frame, and an automated weather station were involved in the observations at the Lushan Meteorological Bureau of Jiangxi Province, China. In this study, for the icing process under a cold surge from 20–25 January2016, the duration, frequency, and spectrum distribution of agglomerate fog were analyzed. The effects of rain, snow, and supercooled fog on icing growth were studied and the icing and meteorological conditions at two heights(10 m and 1.5 m)were compared. There were 218 agglomerate fogs in this icing process, of which agglomerate fogs with durations less than and greater than 10 min accounted for 91.3% and 8.7%, respectively. The average time interval was 10.3 min. The fog droplet number concentration for sizes 2–15 μm and 30–50 μm increased during rainfall, and that for 2–27 μm decreased during snowfall. Icing grew rapidly(1.3 mm h-1) in the freezing rain phase but slowly(0.1 mm h-1) during the dry snow phase. Intensive supercooled fog, lower temperatures and increased wind speed all favored icing growth during dry snow(0.5 mm h-1). There were significant differences in the thickness, duration, density, and growth mechanism of icing at the heights of 10 m and 1.5 m. Differences in temperature and wind speed between the two heights were the main reasons for the differences in icing conditions, which indicated that icing was strongly affected by height.  相似文献   

渤海湾盆地火成岩油气藏勘探研究进展   总被引：11，自引：0，他引：11  

杜贤Yue  肖炊钦 《复式油气田》1998,(4):1-4

以渤海湾盆地火成岩油气藏的勘探为例,综合利用地质、地震、测井等多项资料及多种新技术、新方法,从岩性识别、岩相分析、形成期次、储集层测井识别及其综合评价等五方面,系统介绍了渤海湾盆地火成岩油气藏勘探的新进展、新方法,并就火成岩的岩相分析技术和储集层综合评价方面的“侵入岩储集层三元综合评价技术”进行了重点评述。进而提出了火成岩油气藏勘探研究应全面细致开展岩相分析和储集层预测、评价向半定量－定量化的发展  相似文献