罗伊登说，这个地区在地质上极其不寻常，因为在东部的四川盆地和西部的托比坦高原之间的边界上有非常陡峭的斜坡。
The region is extremely unusual geologically, Royden says, because of the very steep slopes at the boundary between the Sichuan Basin to the east and the Tobetan plateau to the west.
该盆地由中央底辟带和斜坡带两个构造单元组成。
The basin consists of central diapiric zone and a slope zone.
大牛地气田位于鄂尔多斯盆地伊陕斜坡北部，主要含气层位为上古生界石炭系太原组、二叠系山本组和下石盒子组。
Daniudi gas Field lies in the north of Yishan Slope in Ordos Basin. Its mainly gassy formations are Carboniferous Taiyuan formation, Permian Shanxi formation and Lower Shihezi formation.
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