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| 1 | On the development mechanism of the lacustrine high-grade hydrocarbon source rocks of Chang 91 member in Ordos Basin显示文摘As revealed from recent drilling and organic geochemical testing and research, a series of lacustrine high-grade hydrocarbon source rocks was discovered in the upper section of the Chang 9 oil reservoir member of upper Triassic in Ordos Basin. The hydrocarbon source rocks show average TOC content as high as 5.03%, average bitumen 'A' content as high as 0.8603%, and good quality organic precursors, which are of the sapropelic type mainly derived from lower aquatic plants and have reached the thermal evolution stage featured by oil-producing climax. Generally the lacustrine high-grade hydrocarbon source rocks were developed in local depressions of a lake basin, and the Chang 91 member was particularly formed in a depositional environment characterized by fresh water to weakly saline water, weakly oxidizing to weakly reducing setting and semi-deep lake facies, as was demonstrated by a variety of organic to inorganic geochemical parameters. As a result, high productivity constitutes the principal controlling force for generation of this series of high-grade hydrocarbon source rocks. Deposition of thinly-bedded and laminated tuffs as well as positive Eu anomaly corroborate the possible occurrence of anoxic geological event closely related to contemporaneous volcanic eruption, which would play a key part in development of the Chang 91 member of high-grade hydrocarbon source rocks. | ZHANG WenZheng YANG Hua FU SuoTang ZAN ChuanLi | 2007 | Science China Earth Sciences2007，50，z2： | 4 |
| 2 | Paleomagnetism of Eocene and Miocene sediments from the Qaidam Basin: Implication for no integral rotation since the Eocene and a rigid Qaidam Block显示文摘 | Yu Xiangjiang Fu Suotang Guan Shuwei | 2014 | Geochemistry Geophysics Geosystems2014，15，6： | 1 |
| 3 | Northward growth of the Qimen Tagh range: A new model accounting for the Late Neogene strike-slip deformation of the SW Qaidam Basin显示文摘 | Cheng Feng Jolivet M Fu Suotang | 2014 | Tectonophysics2014，632，： | 1 |
| 4 | Method for studying diatomic rovibrational spectra at a given vibrational state显示文摘An algebraic method for rotational energies at a given vibrational state(AMr(v)) is proposed in this study in order to obtain unknown high-lying rovibrational energies. Applications of this method to the ground electronic state X^1Σ^+of CO and the excited state C^1Σ^+of^(39)K^7Li molecules show the following:(1) the AMr(v) can give the rational upper limit J of a rotational quantum number of a diatomic electronic state;(2) the full AMr(v) rovibrational energies {E_(υJ)}_υ of given vibrational states not only reproduce all known experimental data excellently but also predict precisely the values of all high-lying rovibrational energies,which may not be available experimentally. | Yi Zhang WeiGuo Sun Jia Fu QunChao Fan Jie Ma LianTuan Xiao SuoTang Jia | 2019 | Science China(Physics,Mechanics & Astronomy)2019，62，4： | 0 |
| 5 | Effective Slowing and Trapping of Cs Atoms in an Ultrahigh-Vacuum Apparatus显示文摘We report the effective slowing and trapping of Cs atoms in an ultrahigh-vacuum apparatus.The heated Cs atoms in an oven are slowed using a Zeeman slower after the oven chamber and then trapped using a magneto-optical trap in a science chamber.Compared to the traditional vacuum pressure of~10^(−7)Pa determined by the vapor pressure of Cs atoms in the oven chamber,the designed cold nipple and differential pumping tube are used between the oven and the oven chamber to achieve a lower vacuum pressure of~3.6×10^(−9)Pa.This is beneficial for achieving and maintaining an ultrahigh vacuum in the science chamber.We demonstrate the performance of our apparatus through the effective slowing of Cs atoms and an optimal magneto-optical trap. | Li Yuqing Du Huiying Wang Yunfei Wu Jizhou Liu Wenliang Li Peng Fu Yongming Ma Jie Xiao Liantuan Jia Suotang | 2023 | 激光与光电子学进展2023，60，17： | 0 |
| 6 | Wide and fast-frequency tuning for a stabilized diode laser显示文摘External-cavity diode laser(ECDL)has important applications in many fundamental and applied researches.Here we report a method to fast and widely tune the frequency of a stabilized ECDL.The beat frequency between the ECDL and a frequency-locked reference laser is identified by the voltagecontrolled oscillator contained in a phase detector,whose output voltage is subtracted from the flexibly controlled PC signal to generate an error signal for stabilizing the ECDL.The output frequency of the stabilized ECDL can be shifted at a short characteristic time of∼150µs within a range of∼620 MHz.The wide and fast-frequency tuning achieved by our method is compared with other previous works.We demonstrated the performance of our method by the efficient sub-Doppler cooling of Cs atoms with the temperature as low as 6µK. | Yunfei Wang Yuqing Li Jizhou Wu Wenliang Liu Peng Li Yongming Fu Jie Ma Liantuan Xiao Suotang Jia | 2022 | Frontiers of physics2022，17，2： | 0 |
| 7 | Generation of coherent blue light via bichromatic pumping in cesium vapor显示文摘Diode-pumped alkali lasers,possessing high efficiency and narrow linewidth,can provide feasible solutions for wavelength ranges difficult to reach by commercial lasers.In this study,we investigate a generation of coherent blue light(CBL)via four-wave mixing(FWM)-based up-conversion processes in cesium(Cs)vapor.A bichromatic pumping scheme with 852-and 917-nm lasers drives the Cs atoms to the 6D5/2 excited level,followed by cascaded decay of 6D5/2→7 P3/2→6 S1/2,producing 456-nm CBL under phase matching conditions.The fluorescence in multiple bands from blue to near-and far-infrared in the FWM process is demonstrated under different experimental conditions.To optimize the experimental parameters,we investigate the dependence of 456-nm CBL on the vapor temperature,frequency,and intensity of the two pump lasers.A maximum power of 2.94 mW is achieved with pump powers of 430 mW(for 852 nm)and 470 mW(for 917 nm).The corresponding conversion efficiency is 1.5%/W,three-fold higher than those in previous studies.Our results can contribute to fundamental research on atom–photon interactions and quantum metrology. | Guiyuan Ge Li Tian Guoqing Zhang Ningxuan Zheng Wenliang Liu Vladimir Sovkov Jizhou Wu Yuqing Li Yongming Fu Peng Li Jie Ma Liantuan Xiao Suotang Jia | 2023 | Frontiers of physics2023，18，4： | 0 |
| 8 | Reservoir formation conditions and key technologies for exploration and development in Qingcheng large oilfield显示文摘The Qingcheng oilfield,the largest shale oil field in China,was discovered in 2019 in source rock of Chang 7 Member of Mesozoic Yanchang Formation,Changqing Oilfield in Ordos Basin,with newly increased proven geological reserves of 358 million tons,predicted geological reserves of 693 million tons,and a total of 1.051 billion tons of shale oil resources.This achieves a historic breakthrough in exploration of shale oil in Chang 7 Member.In recent years,focusing on key issues,such as whether there develop sweet spots in source rock,whether commercial oil production capacity can be formed,and whether scale-effective development can be achieved,studies about geological conditions for shale oil accumulation have been continuously carried out,key supporting technologies have been developed,and a series of theoretical innovations and technological breakthroughs have been achieved in oil exploration in source rocks.The results indicate that shale oil accumulation in Chang 7 Member is controlled by following factors.Firstly,lacustrine black shale,dark mudstone and other high-quality source rocks lay a material foundation for shale oil formation.Secondly,sandy deposits intercalated within black shale and dark mudstones are exploration sweet spots,and sandbody combination types are controlled by morphology of bottom of the lacustrine basin.Thirdly,reservoir properties are good due to development of micro-nano pore throats.Finally,reservoirs with high oil saturation and high gas-oil ratio are formed due to high-intensity oil charging in source rock.Effective matching of multiple factors is a key for shale oil accumulation in Chang 7 Member in Ordos Basin.Through innovation of key supporting technologies,exploration and development technologies for shale oil are developed,and substantial breakthrough on exploration and development of shale oil is realized.The first application of logging-seismic combination technology in loess plateau improves significantly quality of 3D seismic data,which effectively guides prediction of sandy sweet spots.Three-quality well logging technology is used for further evaluation of geological and engineering sweet spots of shale oil.With volumetric fracturing technology based on precise segmentation of long horizontal wells,initial daily oil production of individual well is increased from previously 10 tons to more than 18 tons.The exploration breakthrough in source rocks in Chang 7 Member in Qingcheng oilfield provides an important resource base for the second accelerated development of Changqing Oilfield.It is predicated that oil production from shale in Chang 7 Member in Qingcheng oilfield will reach three million tons in 2022 and five million tons in 2025. | Suotang Fu Jinhua Fu Xiaobing Niu Shixiang Li Zhiyu Wu Xinping Zhou Jiangyan Liu | 2020 | Petroleum Research2020，5，3： | 0 |
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