从苏北盆地黄桥和朱家墩气田成藏特征看江汉盆地勘探前景   总被引：3，自引：0，他引：3  

陈红  文可东  陈立军 《海相油气地质》2005,10(4):23-29

苏北盆地发育了“黄桥型”和“朱家墩型”两类气藏。黄桥型气藏为断裂—裂缝型复合圈闭,不受层位控制,其气源为具有晚期生烃潜力的海相烃源岩重新深埋后再次生成的烃类气和经多期次火成岩侵入和喷发产生的大量CO2。朱家墩型气藏主要是海相烃源岩深埋后二次生烃形成晚期烃源充注、向上运移到白垩系成藏,属“古生新储”型。江汉盆地的成藏条件与苏北盆地具有可对比性,其中的江陵凹陷具备形成黄桥型气藏的条件,而沔阳凹陷则具备形成朱家墩型气藏的条件。江陵凹陷与苏北黄桥气田在构造演化、储盖条件、烃源、岩浆活动等方面均具有相似性,且前者的成藏条件更显优越。沔阳凹陷与苏北盐城坳陷东南部的烃源岩基础数据具有可比性,古生界均具备多套烃源岩层,且均表现为高演化特点,晚期生烃潜力也相似,其烃源为晚期生烃的古生界和上三叠统—侏罗系。  相似文献   

海水制盐的气象条件分析     

陆晓丽  黄汝红  胡定 《气象研究与应用》2006,27(4):50-53

通过对广西防城港市企沙盐场1996~2005年近10年的原盐产量与气象条件的关系进行分析,得出影响海水制盐的主要气象因子是降水、蒸发量、气温、大风,并提出各种气象条件下的生产对策及气象部门对盐业服务的思路和设想。  相似文献   

延边地区成矿地质条件及金矿找矿   总被引：4，自引：0，他引：4  

刘玉平  时俊峰 《矿产与地质》1999,13(3):153-157

延边地区是吉林省重要产金区之一。金矿与中元古界色洛河群、下古生界五道沟群、三叠－侏罗纪火山岩系及华力西－燕山期中酸性侵入岩、次火山岩和ＮＥ、ＮＷＷ向深断裂带及ＥＷ、ＳＮ向断裂构造、火山构造密切相关。具有较好的找矿前景。  相似文献   

Residual ultimate strength of steel plates with longitudinal cracks under axial compression–experiments     

Jeom Kee Paik   《Ocean Engineering》2008,35(17-18):1775-1783

The main objective of the present study is to examine the residual ultimate strength characteristics of steel plates with cracking damages under axial compressive actions through experimental investigations. The present study is a sequel of the author's previous paper (Paik, J.K., Satish Kumar, Y.V., Lee, J.M., 2005. Ultimate strength of cracked plate elements under axial compression or tension. Thin-Walled Structures, 43, 237–272). In contrast to the previous paper which dealt with transverse cracks located in the direction normal to the axial loading direction, the present paper is concerned with longitudinal cracks which are located in parallel to the axial loading direction. Similar to the previous paper, the orientation/location and size of cracks inside the plates are varied for the present experimental investigations. The details of experimental results are documented. The database and insights developed from the present work will be useful for cracking damage-tolerant design of steel-plated structures and also for condition assessment or health monitoring of aging steel-plated structures.  相似文献   

Distribution, condition, and growth of newly settled southern flounder (Paralichthys lethostigma) in the Galveston Bay Estuary, TX     

Lindsay A. Glass  Jay R. Rooker  Richard T. Kraus  G. Joan Holt 《Journal of Sea Research》2008,59(4):259-268

Several flatfish species, including southern flounder (Paralichthys lethostigma) recruit to estuaries during early life. Therefore, evaluation of estuarine sites and habitats that serve as nurseries is critical to conservation and management. The present study used density data in conjunction with biochemical condition and growth measurements to evaluate settlement sites used by southern flounder in the Galveston Bay Estuary (GBE). In 2005, beam-trawl collections were made in three major sections of the GBE (East Bay, Galveston Bay, West Bay). Three sites were sampled in each bay. Within each sampling site, replicate collections were taken from three habitats: 1) marsh edge (< 1 m depth), 2) intermediate zone (10–20 m from marsh interface;  1 m depth), and 3) bay zone (typically > 100 m from marsh interface; depth > 1 m). Average size of southern flounder collected was 12–19 mm standard length, and peak densities occurred in January and February. Catch data indicated that densities of southern flounder were significantly greater in East Bay (2.75 per 100 m²) than in Galveston Bay (0.91 per 100 m²) or in West Bay (0.45 per 100 m²). Densities were statistically similar among habitats. Otolith-based estimates of age indicated that the majority of southern flounder collected were 35–45 days old and derived from early December to early January hatch-dates. Growth rates were similar among bays and among habitats, with the average growth rate being 0.40 mm day^− 1 (range: 0.21–0.76 mm day^− 1). RNA:DNA was above the established baseline value for nutritional stress, indicating that newly settled southern flounder in the GBE were in relatively high condition. Habitat-specific differences in RNA:DNA ratios were not observed; however, ratios were significantly lower in West Bay (average 8.0) than in East Bay (average 9.5) or in Galveston Bay (average 9.8), suggesting the condition of new recruits may vary spatially within the GBE. Findings from the current study suggest density and condition of newly settled southern flounder vary at the bay scale, suggesting that parts of GBE do not function equally as nurseries.  相似文献   

Annual and spatial variation in the abundance length and condition of juvenile turbot (Psetta maxima L.) on nursery grounds on the west coast of Ireland: 2000–2007     

Paula S. Haynes  Deirdre Brophy  David McGrath  Roisin O'Callaghan  Stephen Comerford  Paul Casburn 《Journal of Sea Research》2010,64(4):494-504

Turbot (Psetta maxima Linnaeus) is a high value commercially exploited marine flatfish which occurs in European waters, from the Northeast Atlantic to the Arctic Circle, the Baltic and Mediterranean Sea. In Ireland, turbot are the most valuable commercial non-quota species. Very little is known about their population dynamics in the wild, in particular during the sandy beach nursery phase of the life history. In 2000, a survey was established to assess flatfish species on nursery grounds on the west coast of Ireland. Eleven sandy beaches were assessed for 0+ turbot by beach seining, over an eight year period (2000–2007) during the months of August and September. The objective of the study was to estimate juvenile turbot abundance and size structure to determine if any spatial and annual trends existed. Large scale variability in the recruitment of fish to nursery grounds may be indicative of fluctuations in the adult stock. Turbot were found to recruit to five beaches consistently over the eight year period. Temporal and spatial variability in the relative abundance and length of turbot was discerned, with no apparent overall trend. However, certain nursery grounds were shown in most of the years examined to support higher abundances of turbot in comparison to other areas over the eight year period. Turbot abundances on nursery grounds were significantly correlated with mean spring sea temperatures during the pelagic stage. The condition of turbot did not significantly differ on an annual or spatial scale. Mean densities of 0+ turbot along the Irish coast were found to be similar and at times higher than other areas in Europe, ranging from 0.1 (± 0.3) individuals 1000 m^− 2 to 18.5 (± 6.9) individuals 1000 m^− 2. Mean turbot total length on beaches ranged from 3.8 cm (± 0.6) to 6.6 cm (± 4.3). The observed spatial and temporal variability in abundance and length highlights the need for long-term studies when assessing juvenile flatfish populations. Results from the present study have provided much needed baseline data on wild juvenile turbot populations which is severely lacking for this species both on an Irish and on a European scale.  相似文献   

Benthic macroinvertebrate field sampling effort required to produce a sample adequate for the assessment of rivers and streams of Neuquén Province,Argentina     

《Limnologica》2017

This multi-year pilot study evaluated a proposed field method for its effectiveness in the collection of a benthic macroinvertebrate sample adequate for use in the condition assessment of streams and rivers in the Neuquén Province, Argentina. A total of 13 sites, distributed across three rivers, were sampled. At each site, benthic macroinvertebrates were collected at 11 transects. Each sample was processed independently in the field and laboratory. Based on a literature review and resource considerations, the collection of 300 organisms (minimum) at each site was determined to be necessary to support a robust condition assessment, and therefore, selected as the criterion for judging the adequacy of the method. This targeted number of organisms was collected at all sites, at a minimum, when collections from all 11 transects were combined. Subsequent bootstrapping analysis of data was used to estimate whether collecting at fewer transects would reach the minimum target number of organisms for all sites. In a subset of sites, the total number of organisms frequently fell below the target when fewer than 11 transects collections were combined.Site conditions where <300 organisms might be collected are discussed. These preliminary results suggest that the proposed field method results in a sample that is adequate for robust condition assessment of the rivers and streams of interest. When data become available from a broader range of sites, the adequacy of the field method should be reassessed.  相似文献   

CINRAD/CD 新一代天气雷达配电监控系统一次 故障分析处理          下载免费PDF全文

雷登林  钟健  田程  彭茜  田孟勤 《中低纬山地气象》2023,47(3):72-75

CINRAD/CD天气雷达在体扫过程中出现系统状态报警,雷达系统掉高压,且实时处理监控和采集软件、实时控制显示终端软件的遥控开关机功能均失效。在深入理解雷达监控系统工作原理的基础上,对雷达监控系统的工作过程进行了分析与梳理,再对相关重要器件进行检测和替换排查,最后确定了此次故障的源头器件,即配电监控组件的部分器件出现功能性损坏,导致连接整机监控通讯接口的RS485接口芯片功能异常。  相似文献   

浅谈区域自动气象站状态监控与异常识别   总被引：2，自引：0，他引：2  

曾海云  陈成海  游文芬  林美英 《气象研究与应用》2011,32(3):81-83

利用广西加密自动气象站数据查询系统和数据的连续性、逻辑性进行判别自动气象站运行状态与数据异常状况。  相似文献   

大柏舍地电台映震能力初析   总被引：2，自引：0，他引：2  

王志贤  彭远黔 《东北地震研究》1997,13(1):25-30

分析了大柏舍地电台１８年的有效观测资料，研究了ρｓ异常变化与周围一定范围内发生的Ｍｓ≥４．０级地震的对应关系，评价了该台的映震能力，结果表明，在所发生的１３次Ｍｓ≥４．０级地震中，有１０次地震前观测到了明显的ρｓ异常变化，其中Ｍｓ≥４．３级地震，都有ρｓ前兆反应，５次５级以上地震尤为显著，表明该台具有较强的映震能力。  相似文献