东营凹陷王家岗地区王古1潜山构造特征及油气成藏条件     

侯方辉  李三忠  王金铎  于建国  吕海青  许淑梅 《中国海洋大学学报(自然科学版)》2007,37(2):341-344,322

进一步了解王古1潜山的构造特征及成藏条件,利用渤海湾盆地济阳坳陷东营凹陷王家岗地区的大量三维地震剖面和一些钻井资料,并结合东营凹陷南坡缓坡带区域构造背景及成藏条件分析认为,王古1潜山初始发育于印支期,后经燕山期拉张断陷,切割为断块并抬升,最后于燕山期定型,为典型的缓坡盆倾残丘潜山。该潜山被NW向和NE向断裂切割,潜山高部位侵蚀风化严重,上覆孔店组盖层及沙河街组烃源岩,油气通过断层和不整合面运移至潜山顶部形成侵蚀残丘型油气藏。  相似文献   

Population dynamics of Callichirus major (Say, 1818) (Crustacea, Thalassinidea) on a beach in northeastern Brazil     

M.L. Botter-Carvalho  P.J.P. Santos  P.V.V.C. Carvalho 《Estuarine, Coastal and Shelf Science》2007,71(3-4):508-516

We describe the structure, reproductive cycle, fecundity, growth, and mortality of a harvested population of the ghost shrimp Callichirus major. Samples were collected at monthly intervals from September 1999 to October 2000 on an urban sandy beach (08°11′S 34°55′W) in northeastern Brazil. During this period the sex ratio did not differ significantly from 1:1 (0.98 M: 1 F). Minimum and maximum sizes of the Dorsal Oval were 2.59 and 12.19 mm for males and 4.46 and 12.62 mm for females, respectively. Ovigerous females were found throughout the period, except between August and September 2000. Maximum lifespan was estimated as 3.3 and 3.4 years for females and males, respectively. This northeastern population differed from others previously studied in southern and southeastern Brazil, in regard to sex ratio, maximum attained size, maturation size, period and duration of the reproductive cycle, and fecundity. We interpret these regional differences as evidence for over-fishing at the study site, and suggest that large-scale management plans for callianassid populations should use regional population parameters.  相似文献   

大民屯凹陷地层水水文地质特征与油气聚集关系   总被引：6，自引：0，他引：6  

史建南  姜建群  张福功  闫家宁 《海洋地质前沿》2003,19(11):24-30

对大民屯凹陷前第三系潜山、下第三系沙河街组地层水化学场研究发现，本区油田水总矿化度及二价阳离子浓度偏低，地层水总矿化度具有明显的垂向分带性，水体主要为陆相成因并受地表水渗入的影响较大，变质程度高，油田水的演化与盐类的溶解有关。该区地层水的流动受断裂和沉积砂体的控制，在水头压力、浮力动力场控制下其流动样式和分布规律反映了凹陷内油气的运聚规律，可为本区自生自储、新生古储式油气藏的判别提供有利证据。  相似文献   

热带西太平洋海洋上层热含量的分布特征及其年际变化的分析   总被引：1，自引：0，他引：1  

白虹  丁宗信  李永祥 《海洋与湖沼》1995,26(2):154-160

选用海面至20℃等温线所处深度水层的平均温度来表征研究海域海洋上层热含量。利用这一特征值，分析1986—1990年期间热带西太平洋边缘海域海洋上层热含量在秋季的分布特征和年际变化。结果表明：（1）热含量呈南高北低分布，在7．5－22．1°N范围内。以130°E断面为代表，热含量的平均递减率为0．179（℃／纬度）；（2）热含量的分布主要取决于环流系统，其等值线因受黑潮和棉兰老海流的影响而由纬向分布转向经向分布。某些区域因受暖涡及冷涡的影响而呈封闭状分布；（3）热含量的年际变化与E1Nino事件存在着很好的相关性，在E1Nino事件发生期间，热含量变得很低，高热含量（大于26．5℃）海区的分布范围明显缩小。  相似文献   

热带气旋的云系结构对其移动影响的数值试验   总被引：1，自引：1，他引：1  

王学忠  沙文钰  端义宏 《热带海洋学报》2003,22(3):52-60

应用上海台风研究所发展的东海热带气旋模式，根据热带云团的特点，设计了积云模型并叠加到台风中去，研究台风云系结构对其路径的影响。理想试验表明，只考虑温度场扰动，台风的移动偏向于密闭云区方向；而仅考虑湿度场扰动，台风的移动无固定的偏向。对9414号台风19940810的初始场，叠加积云模型的试验表明，预报路径较好地反映了其运动的特征。  相似文献   

进入渤海的热带气旋路径特点分析     

张晓慧  卢霞  陈金龙 《海洋预报》2003,20(4):1-4

热带气旋是夏季影响渤海的灾害性天气系统之一。其影响路径主要有三类，各类路径在影响时前期中高纬500hPa高空环流形势及夏季西太平洋副热带高压特征指数有显著差异。  相似文献   

Isotopic and Elemental Variations of Carbon and Nitrogen in a Mangrove Estuary   总被引：6，自引：0，他引：6  

L.A. Cifuentes  R.B. Coffin  L. Solorzano  W. Cardenas  J. Espinoza  R.R. Twilley 《Estuarine, Coastal and Shelf Science》1996,43(6):781-800

Variations in elemental and isotopic ratios of suspended particulate matter (SPM) were investigated in the Guayas River Estuary Ecosystem (GREE) that empties into the Gulf of Guayaquil, Ecuador. Detritus in the system was identified on the basis of extremely high carbon:chlorophyll aratios (>1000). This material had mean δ¹³C of −26·4±0·3, δ¹⁵N of +4·8±0·2, and (C:N)_atomicof 14·1±0·9. The isotopic data were comparable to measurements reported for fresh and degrading mangrove leaves, whereas the elemental ratio was comparatively enriched in nitrogen. Isotope measurements of SPM throughout the GREE were more similar to values for riverine material and detritus compared with that for the coastal end-member. Values indicative ofin situproduced algae, sewage and shrimp pond effluent were only found at selected sites. Bacterial bioassays, which were used to document potential sources of dissolved organic matter in the GREE, were isotopically similar to SPM. This correspondence coupled with the relatively low (C:N)_aof SPM could be explained by bacterial immobolization of nitrogen onto detritus. Finally, tidal variations of (C:N)_aand δ¹³C at a brackish mangrove site were similar in magnitude to spatial variations encountered throughout the GREE. Based on these results, the authors caution that care must be taken when samples are taken for food-web studies in these systems.  相似文献   

雷州半岛灯楼角海岸地貌演变   总被引：10，自引：0，他引：10  

王丽荣  赵焕庭  宋朝景  袁家义  于红兵 《海洋学报》2002,24(6):135-144

灯楼角岬角位于雷州半岛的西南端,地处热带北缘.过去几次开展的区域地貌和第四纪地质调查及制图,均包括本区1),2),[1～2].宋朝景曾做过涉及本区海底的地貌与浅地层调查3),又指导学生研究本段海岸地貌4).近年赵焕庭等[3]开展该区珊瑚礁研究,使用了1960年版航空照片和1964年版1:10000地形图,结合野外调查,进一步研究了本区海岸地貌的演变.  相似文献   

Spatial and temporal variability of heat content above the thermocline in the tropical Pacific Ocean   总被引：1，自引：0，他引：1  

Pu Shuzhen  Yu Fei  Hu Xiaomin  Chen Xingrong 《海洋学报(英文版)》2003,22(2):179-190

Abstract-Heat content of the upper layer above the 20℃ isotherm in the tropical Pacific Ocean isestimated by using the sea temperature data set with a resolution 2°latitude×5°longitude (1980～1993)for the water depths (every 10 m) from 0 m to 400 m, and its temporal and spatial variabilities are an-alyzed. (1) The temporal variability indicates that the total heat in the upper layer of the equatorial Pa-cific Ocean is charcterized by the interannual variability. The time series of the equatorial heat anomaly5 months lead that of the El Nino index at the best positive lag correlation between the two, and theformer 13 months lag behind the latter at their best negative lag correlation. Therefore the equatorialheat content can be used as a better predictor than the El Nino index for a warm or cold event. In addi-tion, it is also found that less heat anomaly in the equator corresponds to the stronger warm events inthe period (1980～1993) and much more heat was accumulated in the 4 years including 1992/1  相似文献   

山东省9216号强热带气旋风暴期间的海岸侵蚀灾害   总被引：14，自引：0，他引：14  

王文海  吴桑云 《海洋地质与第四纪地质》1994,14(4):71-78

本文比较详细地报导了山东省沿岸在９２１６号强热带气旋风暴潮期间的海岸侵蚀灾害情况，分析了灾害的形成原因、特点。最后讨论了与之有关的问题。  相似文献