准噶尔盆地吉木萨尔凹陷二叠系芦草沟组优质烃源岩特征及其生烃机制研究     

王剑  李二庭  陈俊  米巨磊  马聪  雷海艳  谢礼科 《地质论评》2020,66(3):755-764

准噶尔盆地吉木萨尔凹陷芦草沟组发育凝灰物质,凝灰物质在页岩油形成过程中具有的重要作用,其发育层段也是页岩油分布最好的层段,凝灰物质的分布及与有机质生烃关系的研究对于吉木萨尔页岩油油气成藏规律的认识和深入研究具有重要意义。本文通过对吉木萨尔芦草沟组烃源岩精细评价及沉积环境分析,与烃类活动具有成因关系的成岩矿物解剖,探讨了形成优质页岩油源岩的控制因素和生烃机制。烃源岩定性评价结果表明,泥晶白云岩是吉木萨尔凹陷芦草沟组主要生油岩,烃源岩有机质丰度高,有机质类型以Ⅰ型和Ⅱ_1型为主,生烃潜力较好,R_o值分布在0.6%～1.1%,C_(29)αααS/(S+R)值范围在0.3～0.5,显示烃源岩处于成熟阶段;芦草沟组烃源岩中规则甾烷C_(27)、C_(28)、C_(29)分布为C_(27)C_(28)C_(29),结合微观分析认为其生烃母质以藻类和超微生物为主,Ts/Tm值较低,分布在0.05～0.18,具有高含量的β-胡萝卜烷,反映其母质处于半咸水的弱氧化—弱还原的沉积环境之中,而这一时期火山活动提供的凝灰物质对烃源岩的生烃环境及热演化进程都有重要影响,热演化突然增大的层段与有机质成熟的"甜点段"的分布深度一致。凝灰物质与含超微生物及藻类的泥晶白云岩的混合是导致生烃和早期生烃的重要原因,两者混合的不均一性导致页岩油分布与成熟度的不均匀性。  相似文献   

The spectacular fossils of the ‘water margin’: the Cambrian biota of Chengjiang,Yunnan, China          下载免费PDF全文

Mark Williams  David J. Siveter  Derek J. Siveter  Sarah E. Gabbott  Xiaoya Ma  Mark A. Purnell  Peiyun Cong 《Geology Today》2016,32(6):233-237

Shi Nai'an's fourteenth century Chinese epic ‘Water Margin’ tells of the release of 36 heavenly spirits and 72 baleful stars from their captivity beneath a tablet of stone at Mount Longhu in Jiangxi Province. They are reincarnated as the 108 heroes of the Liangshan marsh in Shandong Province, who rise against an unjust world. The virtuous exploits of the ‘108’ were brought to life through the cathode‐ray screens of 1970s television sets, as the TV series The Water Margin introduced heroes like Lin Chong battling his evil nemesis Gao Qiu. Far to the west of Jiangxi Province and several hundred years after the Water Margin during the summer of 1984, a young scientist from Nanjing was working amongst the hills and lakes of southern Yunnan Province. He too overturned a stone slab, releasing from their half‐billion year captivity a cornucopia of new Chinese legends. His name was Xianguang Hou and he had made one of the most momentous fossil discoveries in history, uncovering the exceptionally preserved marine fossils of the Chengjiang biota from the ancient water margin of Cambrian seas.  相似文献   

Retrieval of middle and upper atmospheric wind based on non-full circular fringe recorded by Fabry-Perot Inteferometer     

HouMao Wang  Chong Wang  YongMei Wang  XiaoXin Zhang  Cong Huang  ShaoLin Liang 《中国科学:地球科学(英文版)》2017,60(9):1732-1738

Fabry-Perot Interferometer(FPI) has been used widely for wind measurements of the middle and upper atmosphere.To date, most of FPIs have been based on full-closed circular fringe, which needs 15–25 min to obtain a group of wind velocity(zonal and meridional). However, it is hard to improve the temporal resolution because full-closed circular fringe in several directions cannot be easily imaged onto the same Charge-Coupled Device(CCD) with enough airglow intensity. In this paper, a data processing method is proposed for non-full circular fringe of FPI, which can support CCD with enough area of observations in several directions simultaneously. The method is focused on the center determination of non-full fringe. It includes radial cross-section, peak coordinate determination, and center calculation. Based on the calculated center, the fringe is annular summed. Then its radius is determined subsequently using Gaussian fitting. Finally, the wind is retrieved from the fringe radius. For validation, fringes from two ground-based FPIs were used, which are deployed in Kelan(38.71°N, 111.58°E) and Xinglong(40.40°N, 117.59°E) in China. The results retrieved from non-full fringes of FPIs were compared with that from full-closed circular fringe. The averaged wind deviation between them demonstrates reasonable difference with 5.38 ms~-(1) for 892.0 nm airglow emission, 5.81 ms~-(1) for 630.0 nm emission, and 3.03 ms~-(1) for 557.7 nm emission. Besides, wind results of Xinglong FPI are compared roughly with measurements of meteor radar which is deployed in Ming Tombs of Beijing(40.3°N,116.2°E). Good agreement demonstrates that this method is robust enough for FPI wind retrieval of mesosphere and thermosphere.  相似文献   

Exact solution of entanglement of the double Jaynes—Cummings model without rotating wave approximation     

任学藻  姜道来  丛红璐  黎雷 《海洋学报(英文版)》2010,29(9)

This paper investigates the influences of atom--field coupling and dipole--dipole coupling for atoms on the entanglement between two atoms by means of concurrence. The results show that the sudden death occurs when the atom--field coupling is strong enough, and the collapse and the revival appear when the dipole--dipole interaction is strong enough.  相似文献   

News     

Cong Shuzheng 《水文科学杂志》2013,58(6):626-633

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基于LiDAR数据的城市道路提取与重建     

顾俊凯  刘聪  崔建军  魏宏安 《测绘科学》2010,35(4):142-144,119

本文借助于GIS强大的空间数据管理和分析功能,以Lidar点云数据为数据源,对交通信息系统基础空间数据进行快速采集和更新。文章并且在前人工作的基础上,提出了一种新的基于四维Hough变换的Lidar数据的提取和分类方法,对提取的道路信息进行重构。实践证明,此方法较之传统Lidar数据分类和提取方法,能够有效地解决其计算量过大、噪声过于敏感、道路边缘方向不平行等问题,实现道路的自动提取。  相似文献   

数字化地形图地形原始数据的采集理论及方法   总被引：1，自引：0，他引：1  

孙伟业  宋世磊  孙聪 《测绘与空间地理信息》2010,33(3):240-244

随着我国公路建设任务的日渐繁重,缩短勘测设计周期、提高工作效率变得尤为重要。在这一要求下,数字化地形图的直接应用就成为了一个重要的突破口。本文阐述了数字地形图原始地形数据的获取,着重论述了利用纸质地形图进行数字矢量化获取数据的方法,以此作为构建数字地形图的基础数据,以期为公路勘测设计提供帮助。  相似文献   

吉林松原5.8级震群震相特征     

卢燕红  张洪艳  刘轶男  陈聪  陈闯  蔡宏雷 《地震地磁观测与研究》2017,39(1):67-72

选取2013年松原5.8级震群23个M_S≥3.0地震事件，通过地震波的振动持续时间、速度、周期、振幅等，进行震相识别，综合分析发现：该区域土层较厚，且震源相对较浅，面波较发育，波列的振动持续时间较长；地震震相主要以Pn、Sn、Pg、Sg、PmP、SmS为主：其中PmP、SmS震相在震中距70—110 km范围内较易识别；Pn、Sn震相在震中距150 km以上可较清晰的识别，随着震中距增大，Sn震相在震中距350 km以上将不易识别。  相似文献   

利用重复地震研究盖州震群地区介质变化     

李彤霞  钱蕊  付聪  孔祥瑞  李梦莹 《防灾减灾学报》2017,33(3)

盖州震群自2012年2月2日开始活动,截至2016年12月已活动了近5年的时间,其中持续活动的青石岭序列精定位后的空间展布在5km以内,深度也较为集中,可作为重复地震进行研究。通过计算盖州地区2012年2月—2016年12月M_L≥2.0重复地震序列经射线追踪法校正后的P波走时差,得到了盖州震群区域至岫岩台、辽阳台、高升台、瓦房店台四象限的介质变化情况,结果介质短期的变化受震群本身显著事件活动影响较为明显。中强地震前后周边地区介质变化显著。  相似文献   

Near-source noise suppression of AMT by compressive sensing and mathematical morphology filtering   总被引：5，自引：0，他引：5  

Guang Li  Xiao Xiao  Jing-Tian Tang  Jin Li  Hui-Jie Zhu  Cong Zhou  Fa-Bao Yan 《应用地球物理》2017,14(4):581-589

In deep mineral exploration, the acquisition of audio magnetotelluric (AMT) data is severely affected by ambient noise near the observation sites; This near-field noise restricts investigation depths. Mathematical morphological filtering (MMF) proved effective in suppressing large-scale strong and variably shaped noise, typically low-frequency noise, but can not deal with pulse noise of AMT data. We combine compressive sensing and MMF. First, we use MMF to suppress the large-scale strong ambient noise; second, we use the improved orthogonal match pursuit (IOMP) algorithm to remove the residual pulse noise. To remove the noise and protect the useful AMT signal, a redundant dictionary that matches with spikes and is insensitive to the useful signal is designed. Synthetic and field data from the Luzong field suggest that the proposed method suppresses the near-source noise and preserves the signal well; thus, better results are obtained that improve the output of either MMF or IOMP.  相似文献