中文摘要：

羌塘盆地托纳木地区新生代发育规模较大的洞错地堑构造，走向近南北，长度大于80km，由断隆带和断陷盆地组成，并对研究区地貌和水系格局有明显的控制作用。地堑活动始于中新世，现今仍处于活动之中，其形成可能受深部热动力学机制作用制约。沿地堑正断层存在明显的油气异常，对油气藏具有显著的破坏作用，不利于油气的保存。

英文摘要：

The Cenozoic graben structures known as the Dongco graben are well developed in the Tuonamu region, Qiangtang basin, Xizang , oriented nearly N-S and more than 80 km long, and consist of fault uplift zone and fault basin. These graben structures have an important effect on the local geomorphological features and drainage framework. The tectonic activities in the were initiated during the Miocene, and are still active in modem times. The formation of above-mentioned tectonic activities may be constrained by the deep-seated thermodynamic mechanisms. The oil and gas anomalies are observed along the normal faults in the graben, indicating that the active faults in the may play a significant destructive role in the preservation of oil and gas pools.