中国地质学会2020年度“十大地质科技进展”   总被引：1，自引：0，他引：1  

中国地质学会 《地质论评》2021,67(2):6702339-6702366

大庆油田等:松辽盆地北部古龙页岩油勘探取得重大发现大庆油田在松辽盆地北部古龙凹陷青一段地层的纯页岩内实现水平井产量重大战略突破,试油获高产工业油气流,定产试采表现出稳定的高产能力,平面上15口直井试油证实古龙页岩油平面分布范围广,规模立体含油,轻质油带具有较好的产油能力,轻质油带页岩油气资源量达到几十亿吨。通过岩心精细描述及实验分析化验数据,建立了以古沉积环境控制原始优质烃源岩发育、适中的热演化程度控制油气富集。  相似文献   

Purification of a Diatom and Its Identification to Cylindrotheca closterium     

WANG Song  ZHANG Lin  YANG Guanpin  ZHU Baohua  PAN Kehou 《中国海洋大学学报(英文版)》2015,(2):357-361

A diatom was purified with colony selection and continuous dilution methods. It was identified to Cylindrotheca closterium according to its morphological characteristics and rbc L and 18 s r RNA gene sequences. The alga was not sensitive to ampicillin and neomycin, but sensitive to chloramphenicol which inhibited its growth at concentrations ranging from 50 to 150 μg m L-1. The purified alga was easy to culture and its specific growth rate was 0.207 ± 0.002(d-1). It was resistant to pollution and could be harvested in an easy way. It was relatively high in lipid content(20.08% ± 0.67% of dry weight) and the combined amount of its 16:0 and 16:1(n-7), the most suitable resource of biodiesel, was as high as 64% of the total fatty acids, while the amount of polyunsaturated fatty acids reached 19.96%–20% of the total fatty acids. Thus the purified C. closterium can be cultured as a biodiesel producer or a nutrition supplement producer.  相似文献   

Evaluation of Cytotoxicity and Genotoxicity of Insecticide Carbaryl to Flounder Gill Cells and Its Teratogenicity to Zebrafish Embryos     

EY Manish Raj  GUO Huarong 《中国海洋大学学报(英文版)》2015,(2):362-374

In this study, we determined the cytotoxicity and genotoxicity of carbamate insecticide carbaryl to flounder gill(FG) cells and its teratogenicity to zebrafish embryos. The cytotoxicity of carbaryl to FG cells was determined with methods including MTT and neutral red uptaking(NRU), lactate dehydrogenase(LDH) releasing and Hoechst 33342 and propidium idodide(PI) double staining. Moderate cytotoxicity in a concentration-dependent manner was observed. The 24 h-IC50 value of 53.48 ± 1.21, 59.13 ± 1.19 and 46.21 ± 1.24 mg L-1 carbaryl was obtained through MTT, NRU and LDH assays, respectively. Double fluorescence staining demonstrated that carbaryl induced the death of FG cells mainly through necrosis. There was no significant genotoxicity found in the FG cells exposed to the highest testing concentration of carbaryl(20 mg L-1, P 0.05) as was demonstrated by Comet assay. Zebrafish embryos exposed to carbaryl at concentrations ≥10 mg L-1 displayed moderate toxic effects on the survival, spontaneous movement, hatching, heart rates of the embryos and their development, which were evidenced by yolk and pericardial sac edemas, body length reduction and tail flexure in time- and concentration-dependent manners at specific stages. The 24 h-, 48 h- and 96 h-LC50 values of carbaryl to zebrafish embryos were 41.80 ± 1.10, 17.80 ± 1.04 and 14.46 ± 1.05 mg L-1, respectively. These results suggested that carbaryl is moderately toxic to FG cells cultured in vitro and zebrafish embryos, and the FG cells were similar to zebrafish embryos in their sensitivity to carbaryl as 24 h-IC50 and LC50 indicated.  相似文献   

A Comparative Study of Fish Assemblages Near Aquaculture,Artificial and Natural Habitats   总被引：1，自引：0，他引：1  

WANG Zhenhua  CHEN Yong  ZHANG Shouyu  WANG Kai  ZHAO Jing  XU Qiang 《中国海洋大学学报(英文版)》2015,(1):149-160

Habitat plays a critical role in regulating fish community structure. Using the data collected from a monthly trammel net survey in Ma’an archipelago off the east coast of China, we evaluated impacts of five different habitats(artificial reefs, mussel farms, cage aquaculture, rocky reefs and soft bottom) on fish assemblages. This study suggests that artificial reefs(AR) have significantly higher species richness, abundance and diversity than mussel farms(MF) or soft bottom(SB) habitats during most seasons, and that fish taxa in the AR habitats are similar to those in the rocky reef(RR) habitats. Two different fish assemblage patterns were revealed in the study area using non-metric multidimensional scaling ordination: an assemblage dominated by reef fishes(especially by Scorpaenidae species) in AR, RR and cage aquaculture(CA) habitats and an assemblage dominated by Sciaenidae species in MF and SB habitats. We suggest that reef fishes play a key role in differentiating fish community structures in the study area. Although few differences in fish abundance and diversity were found between the CA and SB habitats, a more diverse age structure was observed in the CA habitats. A much more complex fish assemblage and enhanced population of local species were established as a result of the presence of both floating and fixed artificial structures, probably through improved survival rates.  相似文献   

Effect of Freeze-Thaw Cycles on Mechanical Properties and Permeability of Red Sandstone under Triaxial Compression   总被引：1，自引：1，他引：0  

YU Jin  CHEN Xu  LI Hong  ZHOU Jia-wen  CAI Yan-yan 《山地科学学报》2015,(1):218-231

Geological disasters will happen in cold regions because of the effects of freeze-thaw cycles on rocks or soils, so studying the effects of these cycles on the mechanical characteristics and permeability properties of rocks is very important. In this study,red sandstone samples were frozen and thawed with 0,4, 8 and 12 cycles, each cycle including 12 h of freezing and 12 h of thawing. The P-wave velocities of these samples were measured, and the mechanical properties and evolution of the steady-state permeabilities were investigated in a series of uniaxial and triaxial compression tests. Experimental results show that, with the increasing of cyclic freeze-thaw times, the P-wave velocity of the red sandstone decreases. The number of freeze-thaw cycles has a significant influence on the uniaxial compressive strength, elastic modulus, cohesion, and angle of internal friction. The evolution of permeability of the rock samples after cycles of freeze-thaw in a complete stress-strain process under triaxial compression is closely related to the variation of the microstructure in the rock. There is a highly corresponding relationship between volumetric strain and permeability with axial strain in all stages of the stress-strain behaviour.  相似文献   

基于Surpac软件的王家村金矿化体三维建模研究与应用          下载免费PDF全文

王志亮  胡子建  陈昆明 《山东国土资源》2015,31(4)

山东省平邑县王家村金矿化体赋存于寒武纪地层与顺层侵入的二长斑岩接触部位,为鲁西铜石地区又一新类型金矿,找矿前景良好。传统方法估算矿化体的资源量效果不佳,该文借助Surpac软件工具,在研究王家村金矿（化）体地质特征的基础上,根据矿床以往的地质勘查工程资料,首次建立了王家村矿床地质数据库,构建了矿区的三维可视化地质模型,模型形象直观的展现了矿区地形地貌、矿体展布位置及形态。并应用距离幂次反比法对矿体进行了资源量估算。用此软件进行资源量估算简便且准确,可以根据不同品位实现资源量的动态统计分析。  相似文献   

加权最小二乘优化倾斜摄影测量模型矢量化精度方法研究     

吴家杰  刘锟铭  孙立恒  邓京虎  黄霞  郑勤华 《测绘通报》2021,(4):116-119,135

无人机倾斜摄影测量技术以高精度、高效率、大范围的方式全面感知复杂场景,通过专业的数据采集设备和建模软件恢复三维场景,再进行量测。市场上的三维测图软件大部分是基于立面散点正交原理,不能有效地减弱人工立体测图产生的误差。本文提出一种加权最小二乘直线拟合优化倾斜摄影测量模型矢量化精度的方法,选取南昌市桑海管理委员会部分区域进行地形图数据采集和精度评定,试验表明,采用本文方法所建立的立体测图模型精度提高了2 cm。  相似文献   

Influence of Uneven Trace Spacing on Rayleigh Wave Dispersion     

张双喜  李孟奎 《中国地质大学学报(英文版)》2011,(2)

Rayleigh wave dispersion signals are significant to underground investigation.Tradition-ally,uniformed trace spacing is employed in surface wave surveys.In some cases,however,uneven trace spacing is often encountered because of the limitations of the site condition.In order to study the influence of uneven trace spacing on the dispersion data construction of Rayleigh waves,data acquisi-tion is performed based on a 2.5D field layout with a linear array of geophones fixed and a mobile source.The observation d...  相似文献   

2.5-D DC Resistivity Modeling Considering Flexibility and Accuracy     

汤井田  王飞燕  肖晓  张林成 《中国地质大学学报(英文版)》2011,(1)

We highlighted the flexibility of using unstructured mesh together with the local refinement by a resistivity model with complicated topography. The effect of topography is emphasized. Based on this, we calculated a specific class of layered models and found that the accuracy is not always satisfactory by utilizing the standard approach. As an improvement, we employed the layered earth as the reference model to calculate the wavenumbers. The comparison demonstrates that the accuracy is considerably improved...  相似文献   

Anthropogenic Sulfate and Nitrate Signals in Snow from Bogda Glacier, Eastern Tianshan     

张晓宇  Ross Edwards 《中国地质大学学报(英文版)》2011,(4)

A 1.2 m snow pit was recovered on July 29th, 2009 from the Bogda Glacier, eastern Tianshan (天山). The sample site temperature of -9.6 ℃ indicates that the unique glaciochemical re-cord was well preserved and suitable for the reconstruction of air pollution levels in this previously un-explored region. Samples were analyzed for major ions (Na+, K+, Ca2+, Mg2+, NH4+, Cl-, SO42-, NO3-, HCOO-, and CH3COO-). NO3- and SO42- were characterized by significant high levels of pollution con-centration. Most air masses ...  相似文献