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- When the horizontal level cannot fall down the slope-break, an imperfect horizontal fluctuating cycle is formed, a system of lake expand and lake shrink (dimidiate tracts). 当水平面未下降到坡折带以下时,构成一个不完整的水平面升降旋回,可形成包括湖扩展、湖萎缩2个体系域的层序(二分体系域)。
- In the sequence of dimidiate tracts, mud.stone and oil shale in the lake expansion system tract are good source rocks and seals, providing favorable conditions for forming giant oil/gas fields. 这类砂体成藏条件优越。往往形成大型油气藏;三分体系域层序的低位域砂体成藏条件优越,地震剖面易于识别,是隐蔽油气藏勘探的主要目标。
- When the horizontal level does not fall down the slope-break, it makes an incomplete horizontal fluctuating cycle, forming lake expansion and lake shrinking tracts (dimidiate tracts). 这两种层序在纵向上呈规律性叠置组合。构成了盆地层序充填序列。在二分体系域层序中,湖萎缩体系域上覆的湖扩展体系域泥岩、油页岩是良好的烃源岩和盖层。
- Keywords slope-break;trisection tract;dimidiate tract;subtle trap; 坡折带;三分体系域;二分体系域;隐蔽圈闭;
- dimidiate tracts 二分体系域
- He wrote all the campaign tracts. 这些竞选传单全是他写的。
- He owns a large tract of forest. 他拥有一大片森林。
- He had an infection in the upper respiratory tract. 他上呼吸道感染。
- He took many photos of the wide tracts of desert in North Africa. 他拍了许多关于北非的广大沙漠的照片。
- dimidiate tract 二分体系域
- A line established by sighting in surveying a tract of land. 横断线在测量一块土地时通过目视确定的线
- To the north of the river is an immense wooded tract. 河北面是一大片林地。
- They reclaimed large tracts of wasteland. 他们开垦了大片荒地。
- Hordes of locusts the crops in tracts rice field. 成群成群的蝗虫毁灭了大片大片的稻田庄稼。
- They opened up large tracts of wasteland. 他们开垦了大片荒地。
- Large tracts of wasteland have become a granary. 荒滩变成米粮川。
- The explorers entered upon a desert tract. 勘探人员进入了一片沙漠地带。
- Vast tracts of forest burned for a week. 大范围的林木一直延烧了一个星期。
- There are tracts of desert in Australia. 澳大利亚有大片沙漠。
- We opened up large tracts of wasteland. 我们开垦了大片荒地。