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| 1 | Theories,technologies and practices of lacustrine shale oil exploration and development:A case study of Paleogene Kongdian Formation in Cangdong sag,Bohai Bay Basin,China显示文摘As the main factors affecting stable and high production and the production regularity of lacustrine shale oil are unclear,the theoretical understandings,key exploration and development technologies,development effect and production regularity of lacustrine shale oil have been analyzed and summarized based on 700 m cores taken systematically from Paleogene Kong 2 Member of 4 wells in Cangdong sag,over 100000 analysis data and formation testing data.Three theoretical understandings on shale oil enrichment and high production have been reached:(1)High-quality shale with“three highs and one low”is the material base for shale oil enrichment.(2)Medium-slightly high thermal evolution degree is the favorable condition for shale oil enrichment.(3)Laminar felsic shale is the optimal shale layer for oil enrichment in semi-deep lake facies.Key exploration and development technologies such as shale oil enrichment layer and area evaluation and prediction,horizontal well pattern layout,shale oil reservoir fracturing,optimization of shale oil production regime have been established to support high and stable shale oil production.Under the guidance of these theoretical understandings and technologies,shale oil in Cangdong sag has achieved high and stable production,and 4 of them had the highest production of over 100 tons a day during formation testing.In particular,Well GY5-1-1 L had a daily oil production of 208 m^(3).By April,2022,the 28 wells combined have a stable oil production of 300–350 tons a day,and have produced 17.8×10^(4) t of oil cumulatively.It is found that the shale oil production of horizontal well declines exponentially in natural flow stage,and declines in step pattern and then tends stable in the artificial lift stage.Proportion of light hydrocarbons in produced shale oil is in positive correlation with daily oil production and decreases regularly during production test. | ZHAO Xianzheng ZHOU Lihong PU Xiugang JIN Fengming HAN Wenzhong SHI Zhannan CHEN Changwei JIANG Wenya GUAN Quansheng XU Jing LIU Xuewei ZHANG Wei MA Jianying | 2022 | Petroleum Exploration and Development2022，49，3： | 4 |
| 2 | Impacts of land use and planning on island ecosystem service values: a case study of Dinghai District on Zhoushan Archipelago, China显示文摘Recently designated as a new special economic zone in China,Zhoushan Archipelago is going through a rapid land use change that is expected to have significant impacts on ecosystem services.However,there is no baseline of ecosystem service value(ESV)of the Zhoushan Archipelago up to date,making it impossible to assess any impacts of land use changes.In this study,we adopted the concept of“equivalent value per unit area of ecosystem services in China”and computed the ESV for 2006,2012,and 2020 of a representative district,Dinghai,on the Zhoushan Archipelago.We then analyzed the spatial and temporal patterns of land use changes and their impacts on ESV.The results indicated that the ESV of Dinghai District declined by 59.3 M Chinese yuan($9.5 M US dollars)from 2006 to 2012 and would further decrease by an additional 30.9 M yuan($5 M US dollars)by 2020 according to its planned land uses.These declines in ESV were primarily due to increases in buildup areas and losses in wetland,farmland,and water areas.The results imply that more attention should be paid to controlling urban growth and protecting coastal wetlands in order to preserve valuable ecosystem services of the Archipelago. | Xiaoyun Shao Changwei Jing Jiaguo Qi Jingang Jiang Qiankun Liu Xiumin Cai | 2017 | Ecological Processes2017，6，1： | 2 |
| 3 | Comparison and validation of SRTM and ASTER GDEM for a subtropical landscape in Southeastern China显示文摘This paper evaluates the quality characteristics of existing versions of 3-arc-second SRTM and 1-arc-second GDEM over Anji County,Zhejiang,China using reference elevations from a high-quality 1:10 k topographic map.Results show that SRTM has higher accuracy(RMSE=12.44 m)than GDEM(RMSE=14.20 m for Version 1,12.76 m for Version 2);however,unsatisfactory void filling and an overall 1/2 pixel shift exits in SRTM version 4.1.Although spurious elevations over omitted water bodies still persist,GDEM Version 2 demonstrated significant improvement over Version 1.Accuracies of both SRTM and GDEM decrease on steeper slopes.Aspect also influences both the magnitude and the sign of errors.DEM accuracy in non-forested areas is considerably higher than that in forested areas.SRTM version 4.1 and GDEM version 2 possessed actual spatial resolutions of 90 m,despite both of them failed to match their nominal accuracies.SRTM Version 4.1 could be the first choice,while ASTER GDEM Version 2 would be a good alternative for areas where extensive voids exist in SRTM. | Changwei Jing Ashton Shortridge Shengpan Lin Jiaping Wu | 2014 | International Journal of Digital Earth2014，7，12： | 1 |
| 4 | The promoting effect of La, Mg, Co and Zn on the activity and stability of Ni/SiO 2 catalyst for CO 2 reforming of methane显示文摘 | Jianqiang Zhu Xiaoxi Peng Lu Yao Jing Shen Dongmei Tong Changwei Hu | 2011 | International Journal of Hydrogen Energy2011，，12： | 1 |
| 5 | Correlation methods of base-level cycle based on wavelet neural network显示文摘The authors discussed the method of wavelet neural network(WNN) for correlation of base-level cycle.A new vectored method of well log data was proposed.Through the training with the known data set,the WNN can remenber the cycle pattern characteristic of the well log curves.By the trained WNN to identify the cycle pattern in the vectored log data,the ocrrelation process among the well cycles was completed.The application indicates that it is highly efficient and reliable in base-level cycle correlation. | Xingke XU Changwei CHEN Jing SUN Qinglong MENG | 2007 | Global Geology2007，10，1： | 0 |
| 6 | Hybridized S cathode with N719 dye for a photo-assisted charging Li-S battery显示文摘Nowadays,huge consumption of fossil fuels brings about serious energy crisis and environmental problems,which urge researchers to explore novel sustainable energy sources and storage systems[1,2]. | Jingfa Li Changwei Ren Linbiao Zhang Wenhao Jiang Hongmin Liu Jing Su Min Li | 2022 | Journal of Energy Chemistry2022，31，2： | 0 |
| 7 | Time difference based measurement of ultrasonic cavitations in wastewater treatment显示文摘Intensity of cavitation is significant in ultrasonic wastewater treatment,but is complicated to measure.A time difference based method of ultrasonic cavitation measurement is proposed.The time differences at different powers of 495 kHz ultrasonic are measured in experiment in comparison with conductimetric method.Simulation results show that time difference and electrical conductivity are both approximately positive proportional to the ultrasonic power.The degradation of PNP solution verifies the availability in wastewater treatment by using ultrasonic. | 朱昌平 Wang Bin Liu Changwei Gong Runhang Liu Jing Ren Qinggong Han Qingbang Huang Bo Shan Minglei Tang Yibin Ni Caihua | 2016 | High Technology Letters2016，22，1： | 0 |
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