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- 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。
- 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;
- 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)。
- 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。
- dimidiate tract 二分体系域
- 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。
- 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。
- The explorers entered upon a desert tract. 勘探人员进入了一片沙漠地带。
- A sandy tract or dune by the seashore. 沙丘海边的沙地或沙丘
- A tract of territory had been sliced away. 领土被割去了一块。
- He wrote a tract on this subject. 他曾对此写了一篇短文。
- What he saw was a tract of sand. 他看到的就是一片沙地。
- The phylogeny of the amphibian intestinal tract. 两栖动物肠道的演化发展
- Lacking a true body cavity or digestive tract. 无体腔的,无消化道的无真正意义上的体腔的或无消化道的
- A disease of the intestinal tract. 肠病一种肠道疾病
- A tract of water for raising fish is a fish farm. 一片养鱼的水是鱼塘。
- dimidiate tracts 二分体系域
- To the north of the river is an immense wood tract. 河北面是一大片林地。