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meandering delta
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     THE FAULT DELTA
     断块型三角洲
短句来源
     (4)delta ;
     (4)三角洲;
短句来源
     The first kind of delta mainly developed in meandering stream water system;
     曲流河浅水海相三角洲主要发育于曲流河水系 ,沉积物较细 ,地形坡度平缓 ,喷流机制为似等密度流 ,水体密度较大 ,以河流、波浪和潮汐作用为主 ;
短句来源
     The environment is the braided river, meandering river-delta, and delta and shallow lake, with the ephemeral sea transgression.
     沉积环境在侏罗纪早期为辫状河—辫状河三角洲环境、中期为曲流河—三角洲环境 ,后期为三角洲和浅湖环境 ,中期有短暂的海泛发生。
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     (6)meandering reach;
     ⑥宽滩蜿蜒河段;
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The Liaohe depression has a fairly high hydrocarbon abundance in the Bohai Gulf basin. There are various depositional systems and assemblage types of depositional systems. Among them, gentle-slope braided-delta, steep-slope fan-delta, fandelta, gentle-slope distal subaqueous fan are the best for bearing oil. According to oil abundance, from high to low, these depositional systems are successively braided-delta, fan-delta, gentle-slope subaqueous fan, steep-slope subaqueous fan,meandering-delta,...

The Liaohe depression has a fairly high hydrocarbon abundance in the Bohai Gulf basin. There are various depositional systems and assemblage types of depositional systems. Among them, gentle-slope braided-delta, steep-slope fan-delta, fandelta, gentle-slope distal subaqueous fan are the best for bearing oil. According to oil abundance, from high to low, these depositional systems are successively braided-delta, fan-delta, gentle-slope subaqueous fan, steep-slope subaqueous fan,meandering-delta, shoal bar and fluvial systems. The Liaohe oil field has experienced exploration and development for more than 30 years, and has become the third biggest oil field in China. Since 1980s, new development in oil exploration has been made in some locations, such as: beach (taking up 1/5 of whole depression in area ), deep-set reservolrs of nonmarine sags (deeper than 3 km),and buried hill, which will be the top exploration targets of Liaohe in the future. It has important value for the evaluation of deep-set reservoirs and beach and for the prediction of prospective districts, to research depositional systems, assemblage types, distribution and oil-bearing properties and to combine with analysis of traps. To reach the destination of gaining more reserve by drilling fewer wells, we should better be aimed at the exploratory targets to strengthen comprehensive analysls of many disciplines. And we should better notice sand types and distribution among different-order lacustrine flooding surfaces to find lithological and stratigraphic oil/gas accumulations.

辽河动陷是渤海湾盆地油气资源丰度很高的一个断陷,发育各种类型的沉积体系和它们的组合类型,以缓坡辫状河三角洲、陡坡扇三角洲和缓被远岸水下扇、陡坡近岸水下扇含油性最佳;在各类沉积体系中,技含油丰度由高到低排序,依次为辫状河三角洲、扇三角洲、缓坡水下扇、陡坡水下扇、曲流河三角洲、滩坝和河流。该协陷经过30年的勘探、开发,已建成中国第三大油田。80年代以来,在其滩海地区(面积约占全场陷的1/5)、陆上各凹陷的深层(埋深大于3km)和古潜山的油气勘探又有新进展,是今后辽河动陷最重要的勘探领域。进一步研究辽河坳陷沉积体系类型及其组合型式、分布规律和含油性,并与圈闭分析相结合,对其深层和滩海的评价及有利勘探目标的预测有重要价值;要针对勘探目标特点,加强多学科综合分析工作,以达到少打井多拿储量的目的;要注意各级湖泛面之间砂体的类型和分布,进一步寻找老性和地层油气藏。

Now in the development of oilfields, it is far from enough to determine only the sedimentary facies of sandbodies, and the width, length and the other parameters of the sandbodies should be predicted precisely. This is quantitative study of sedimentary facies referred to in this paper. On the basis of drilling data,and fine division and correlation of strata, quantitative study was made on the sedimentary facies of the lower Member of Lower Tertiary Xiaganchaigou Formation of Shaxi Oilfield, Qinghai Province....

Now in the development of oilfields, it is far from enough to determine only the sedimentary facies of sandbodies, and the width, length and the other parameters of the sandbodies should be predicted precisely. This is quantitative study of sedimentary facies referred to in this paper. On the basis of drilling data,and fine division and correlation of strata, quantitative study was made on the sedimentary facies of the lower Member of Lower Tertiary Xiaganchaigou Formation of Shaxi Oilfield, Qinghai Province. The lower Member of Ganchaigou Formation consists of clastic rocks, about 250 m thick. It is divided into four oil-containing formation sets, i.e. I, II, III and IV. The Formation set IV is deposited in delta plain environments of a braided river delta, and formation sets I, II and III are deposited in delta plain environments of a meandering river delta. In the delta plain of the braided river delta, sandbodies are mainly deposited in distributary channels. These sandbodies are wide ribbons in shape and SW-NE in trend. They are commonly 1 200-3 000 m wide and 5-10 m thick. Their width/thickness is commonly 200-280. In the delta plain of the meandering river delta, sandbodies are mainly deposited in distributary channels. These sandbodies are narrow ribbons in shape. They are commonly 400-700 m wide and 3-6 m thick. Their width/thickness is commonly 80-110. Sandbodies of the braided delta plain are wider and thicker than those of meandering delta plain. This is because frequent shifting of braided distributary channels leads to lateral combining and vertical superimposing of sandbodies. Due to diffenrent width of sandbodies of different facies, inter-well distance of development wells should be different for braided delta plain and meandering delta plain.The core analysis shows that sandstone reservoirs of the braided delta plain are higher in porosity and permebility than those of the meandering delta plain. The braided delta plain is more favorable for oil and gas exploration than the meandering delta plain.

随着油田开发难度的加大 ,开发中仅仅把储集砂体的沉积相类型确定下来是远远不够的 ,还要求准确地预测砂体的宽度、长度等定量参数 ,这就是文中所指的沉积相定量研究。根据大量钻井资料 ,在地层精细划分对比的基础上 ,对青海砂西油田古近系下干柴沟组下部辫状河三角洲平原和曲流河三角洲平原进行了定量研究 ,确定了分流河道砂体的宽度、宽 /厚比等参数。研究表明 ,本区辫状河三角洲平原的分流河道砂体宽多为 1 2 0 0— 30 0 0m ,厚多为 5— 1 0m ,宽 /厚比 2 0 0— 2 80。曲流河三角洲平原的分流河道砂体宽多为 40 0— 70 0m ,厚多为 3— 6m ,宽 /厚比 80— 1 1 0。辫状三角洲分流河道砂体比曲流三角洲分流河道砂体普遍宽、厚的原因是由于辫状三角洲分流河道频繁摆动改道引起砂体的横向拼合和垂向叠置所致。这种河道可称复合河道。利用“厚度中心法”可区分复合河道与单河道。由于不同沉积相的砂体宽度不同 ,在油田开发中的井网部署方案应该不同

The alluvial lacustrine deposits from the Paleogene Shahejie Formation in the Bonan depression, Shengli Oil Field consist of the meandering delta facies, braided delta facies, fan delta facies, subaqueous fan facies and lacustrine facies, including 14 subfacies and 35 microfacies. Among them the braided delta facies is best developed and distinctive from the other types. The braided delta facies comprises the braided delta front subfacies and prodelta subfacies. The braided...

The alluvial lacustrine deposits from the Paleogene Shahejie Formation in the Bonan depression, Shengli Oil Field consist of the meandering delta facies, braided delta facies, fan delta facies, subaqueous fan facies and lacustrine facies, including 14 subfacies and 35 microfacies. Among them the braided delta facies is best developed and distinctive from the other types. The braided delta facies comprises the braided delta front subfacies and prodelta subfacies. The braided delta front subfacies consists chiefly of the subaqueous distributary channel bars composed of gravel bearing sandstones and medium to coarse grained sandstones. In the deltas outlined above, there occur the cross beddings, especially the horizontally aggraded cross beddings produced by the lateral migration of the channel bars.

渤南洼陷古近系沙河街组为一套冲积 湖泊沉积 ,由曲流河三角洲相、辫状河三角洲相、扇三角洲相、水下扇相和湖泊相组成 ,可分出 14个亚相 ,35个微相 ,其中辫状河三角洲最发育 ,其特征显著 ,明显有别于其它四种类型的三角洲。研究区辫状河三角洲由辫状河三角洲前缘及前三角洲构成 ,辫状河三角洲前缘的主体是由含砾砂岩及中粗粒砂岩组成的水下分流河道砂坝 ,三角洲中交错层理发育 ,其中尤以水道砂坝侧向迁移加积而形成的侧积交错层异常发育为标志

 
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