Relation between source rock properties and wireline log parameters: An example from Lower Jurassic Posidonia Shale, NW-Germany   总被引：1，自引：0，他引：1  

U. Mann  D. Leythaeuser  P.J. Müller 《Organic Geochemistry》1986,10(4-6)

The relationships between source rock quality and wireline log parameters were established for the Lower Jurassic Posidonia Shale, the most prolific petroleum source rock of Central Europe. Wireline logs used are the gamma ray spectrometry, density, sonic and various resistivity logs. The organic geochemical parameters considered include the organic carbon content, hydrogen index, and the hydrocarbon potential expressed by pyrolysis yield. The case history presented is based on a continuous core through the entire Posidonia Shale interval from a location where this source rock is immature. Care was taken to detect and to avoid samples and log values influenced by bore hole roughness and fractures. Fair correlations were observed only between uranium content from gamma ray spectrometry log and organic carbon content. No correlation was recognized between uranium content and kerogen type as defined by hydrogen indices. For various reasons density, sonic, and resistivity logs did not provide useful data in this study.Three rock units with irregular, high and low uranium contents could be differentiated. Possible causes for this tripartition are different environments during deposition and postdepositional redistribution of uranium during early diagenesis and in association with fractures.  相似文献   

枢纽机场的航班波体系结构及其喂给航线的空间格局研究   总被引：1，自引：0，他引：1  

黄洁  王姣娥 《地理科学》2018,38(11):1750-1758

基于航班波的概念,提出了航班波识别的技术流程和喂给航线的研究方法,并对全国十大枢纽机场的航班波体系进行了研究与甄别。在此基础上,进一步分析了拥有明显航班波体系的枢纽机场的喂给航线空间格局演化。研究发现：① 北京首都、上海浦东、广州白云和昆明长水机场拥有较为明显的航班波体系;成都双流、深圳宝安、西安咸阳机场的航班波体系尚不清晰。②首位航空公司拥有足够的航班数量是机场构建航班波的必要但非充分条件,时刻资源的优化配置更为关键。③北京首都、上海浦东和广州白云三大枢纽机场的国际喂给航线和国内喂给航线在空间上存在显著的差异,且总体上与地理临近性无关,更多地与首位航空公司的航线网络扩张相关。  相似文献   

Mussel farming as a nutrient reduction measure in the Baltic Sea: consideration of nutrient biogeochemical cycles   总被引：1，自引：0，他引：1  

Stadmark J  Conley DJ 《Marine pollution bulletin》2011,62(7):1385-1388

Nutrient loads from the land to the sea must be reduced to combat coastal eutrophication. It has been suggested that further mitigation efforts are needed in the brackish Baltic Sea to decrease nutrients, especially in eutrophic coastal areas. Mussel farming is a potential measure to remove nutrients directly from the sea. Mussels consume phytoplankton containing nitrogen (N) and phosphorus (P); when the mussels are harvested these nutrients are removed from the aquatic system. However, sedimentation of organic material in faeces and pseudo-faeces below a mussel farm consumes oxygen and can lead to hypoxic or even anoxic sediments causing an increased sediment release of ammonium and phosphate. Moreover, N losses from denitrification can be reduced due to low oxygen and reduced numbers of bioturbating organisms. To reveal if mussel farming is a cost-effective mitigation measure in the Baltic Sea the potential for enhanced sediment nutrient release must be assessed.  相似文献   

新一代天气雷达天馈系统故障分析诊断方法和技巧   总被引：1，自引：0，他引：1  

潘新民  崔炳俭  王全周  黄跃青  胡斌 《气象科技》2013,41(6):982-987

故障分析诊断技术对保障气象大型装备可靠业务运行具有重要作用。依据CINRAD/SB型新一代天气雷达天馈系统信号流程,通过对新一代天气雷达天馈系统故障诊断方法进行研究,总结出天馈系统漏气、打火故障检测方法,天馈系统损耗大的故障诊断流程和故障定位6种方法。按照故障诊断流程和其中的外接信号源联合频谱仪法,分析诊断、定位并修复了天馈系统天线座内环流器故障导致的雷达观测回波强度偏弱、灵敏度降低故障的典型个例。结果表明,根据雷达现场配备仪表状况,通过故障诊断流程,采用合适方法和技巧,可达到快速定位天馈系统故障部位、在最短时间修复雷达故障目的。  相似文献   

Fingered Intrusion of Shallow Saucer-shaped Igneous Sills: Insights from the Jiaojiang Sag, East China Sea     

GUO Rui  ZHANG Gongcheng  ZHANG Jinwei  ZHAO Xingbin  LIU Junbang  YUAN Dawei  SONG Shuang 《《地质学报》英文版》2013,87(5):1306-1318

An extensive suite of igneous sills was intruded into the Tertiary sedimentary section of the Jiaojiang sag,East China Sea.This suite has been well imaged offshore through 2D and 3D seismic surveys,showing a close relationship with CO2 content in nearby gas discoveries.A new observational model,which incorporates simple upward propagation,simple horizontal propagation,and transgressive propagation,was proposed to interpret these sill intrusions.In this model,the source magma of the saucer-shaped sills was injected from their lowest points near the center.The transgressive propagation can be interpreted as a combination of the vertical and horizontal propagation.Most shallow sub-volcanic intrusions in the Jiaojiang sag exhibit fingered characteristics,both vertically and horizontally.The vertical fingered propagation produced saucer-shaped sills arranged in the flower style.Along the brims of lower sills could usually be found the upper sills,which are interpreted to have formed simultaneously with or later than the lower feeder sills.In the second type,the chilled paths of the older sills were reutilized by subsequent intrusions.The horizontal fingered propagation formed sheet intrusions that exhibit groove,lobate,tubular,and crevasse splaylike geometry in plan view.In 3D view,the sheet intrusions have still preserved the lower center and higher rim that similar with the sub-rounded saucer-shaped sills.Although fracture propagation may be important,flow inflation was the key mechanism of magma intrusion.Further consideration of the mechanisms underlying sill formation may help explain the fingered characteristics of sill propagation.  相似文献   

绳索取心钻进技术在煤田勘探超深孔施工中的应用   总被引：1，自引：0，他引：1  

王有东 《中国煤炭地质》2009,(4):67-69

针对孔深超过1 000m时,原有绳钻设备、机具、工艺、技术无法达到钻探施工的要求。特别是施工中因裂隙、溶洞发育,常会发生涌、漏水严重,泥岩缩径,煤层多,粉煤多,易坍塌等情况。为解决该区钻孔施工难题,研究出绳索取心钻进钻具实行三级配套方案,在施工中采用合理的钻孔结构,用套管隔离不稳定地层,在钻进中运用金钢石钻头,在粉煤取心时选择底喷式（侧喷）金刚石钻头,保证泥浆质量等技术措施,并对不同地层条件下的钻进参数、冲洗液配方和钻进方法进行了介绍。通过大河矿区深部勘探应用实例,证明该方法可有效缩短工期,提高经济效益。  相似文献   

河南省洛宁上宫金矿复杂地层钻探施工技术          下载免费PDF全文

祁新堂  谢永德  刘梁  任飞飞 《探矿工程》2020,47(3):38-43

河南省洛宁上宫金矿区地质条件复杂,地层破碎,特别是中下部蚀变绿泥石化严重,遇水分散剥落坍塌,易造成下钻困难、埋钻等事故,施工难度大。针对矿区地层特点,从设备材料选型、钻孔结构、钻头选用等方面采取措施,重点应用成膜冲洗液解决蚀变破碎绿泥石化地层孔壁失稳取心钻进困难问题,取得了显著效果,为今后复杂地层施工积累了一定的经验。  相似文献   

地质特深孔绳索取心钻杆机械性能研究          下载免费PDF全文

尹浩  梁健  孙建华  彭莉  郭宝科  李鑫淼  蔡纪雄  刘秀美 《探矿工程》2020,47(4):58-64

地质特深孔绳索取心钻杆结构区别于API石油钻杆,其机械性能计算不可直接引用API石油钻杆的相关理论公式。针对这一理论依据与计算方法缺失,本文对地质特深孔双台肩钻杆接头进行了受力分析,开展了钻杆接头拉伸载荷与扭转载荷计算理论研究,构建了绳索取心钻杆机械性能计算的理论方法。同时,通过有限元分析和台架试验,确定了H-5000规格双台肩绳索取心钻杆的机械性能,验证了计算方法的准确性,并提出了钻杆结构改进建议与下一步研究方向,为高性能薄壁绳索取心钻杆“服役”于5000 m地质岩心钻探工程提供了技术支撑。  相似文献   

涞源龙门金多金属矿普查绿色勘查实践          下载免费PDF全文

张万河  和新  郝国利  刘成  张淼鑫  杨永超 《探矿工程》2020,47(7):73-77

河北省涞源县龙门金多金属矿普查工作,贯彻绿色勘查理念,对槽探工程、老硐清理、钻探工程按《绿色勘查指南》进行了专项设计并付诸实施。槽探工程施工挖掘的腐植土和碎石就近分开堆放并遮盖,待项目验收合格后,回填腐植土和碎石,最后平整并绿化;老硐清理出的碎石选择离硐口较近的相对平坦的地方堆放,并做好防护工作,最后覆土绿化;钻进工程采用清水和环保泥浆做冲洗液,金刚石单管和绳索取心钻进,提高了效率,减少了对地质环境的影响。机台建设占地少,施工过程中避免油污等的外溢,项目竣工验收后地貌恢复采用植草、自然恢复等绿化方法。绿色勘查充分贯彻了绿水青山就是金山银山的绿色发展理念。  相似文献   

Trophic ecology of the sea urchin Spatangus purpureus elucidated from gonad fatty acids composition analysis     

Barberá C  Fernández-Jover D  López Jiménez JA  González Silvera D  Hinz H  Moranta J 《Marine environmental research》2011,71(4):235-246

Irregular sea urchins such as the spatangoid Spatangus purpureus are important bioturbators that contribute to natural biogenic disturbance and the functioning of biogeochemical cycles in soft sediments. In the coastal waters of the Balearic Islands S. purpureus occurs in soft red algal beds, and can reach high densities. The diet of S. purpureus is unknown and it is particularly difficult to analyze the stomach contents of this group; therefore, we analyzed the fatty acid (FA) composition of the gonads and potential food resources in order to assess the trophic relationships of this species. The FA profiles of the gonads of S. purpureus agree well with the FA composition of the potential trophic resources (algae and sediment) and reveals changes between localities with different available resources. Three polyunsaturated FAs mainly contributes in the composition in the S. purpureus gonads: eicosapentaenoic acid (C20:5n-3) and arachidonic acid (C20:4n-6), both abundant in the macroalgal material, and palmitoleic acid (C16:1n-7), which is characteristic of sediment samples. Trophic markers of bacterial input and carnivorous feeding were significantly more abundant in sea urchins caught on bottoms with less vegetation. The current study demonstrates that the FA content of S. purpureus gonads is a useful marker of diet, as differences in the profiles reflected the variations in detritus composition. The results of this study show that this species has omnivorous feeding behavior; however, viewed in conjunction with available abundance data the results suggest that phytodetritus found within algal beds is an important carbon source for this species.  相似文献