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N an elongated trough of land produced by subsidence of the earth's crust between two faults 地堑
Dayangshu Basin was in extensional setting in the Quaternary period, and a series of small extensional half-grabens were formed.
第四纪大杨树盆地具有伸展的特征，发育一系列小型伸展断陷。
Subei basin is composed of small half grabens and features in closely-spaced faults, small traps, and homogeneous hydrocarbon abundance.
苏北盆地由小型箕状凹陷组成，断层密度高、圈闭面积小、油气贫富不均是其复杂性的主要表现。
Several grabens were developed within Jianghan basin and their formation and evolution are essential to accumulation of oil and gas in the basin.
江汉盆地内部发育多个断陷带，研究其形成与演化对查明盆地油气运聚至关重要。
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