箕状断陷盆地坡折带与隐蔽油气藏勘探--以二连盆地乌里雅斯太断陷南洼为例

箕状断陷湖盆中发育陡坡坡折带和多级缓坡坡折带，它们对沉积、储层的展布和隐蔽油气藏的成藏具有控制作用。以经典层序地层学理论为基础，应用“坡折带”概念，识别出乌里雅斯太断陷南洼缓坡带由三级坡折带组成，深入分析了各级坡折带的成藏特点，认为二级坡折带为最有利的隐蔽油气藏发育带。

Slope-Break Zones in Half-Graben Fault Basin and Exploration of Subtle Pools: A Case Study of the Southern Sag of Wuliyastai Depression in Erlian Basin

Generally,there are more than one gentle-slope zone and a steep-slope break zone in the half-graben fault basin.These slope-break zones not only controlled the distribution of the depositional system traces and the sand bodies,but also controlled the formation of the subtle pools.Based on the classical sequence stratigraphy principles and the concept of the slope-break zone,three slope-break zones are identified in the gentle slope-break zone of the Southern Sag of Wuliyastai Depression in Erlian basin.The first one is a structural or erosional slope-break zone,the second one is a structural or sedimentary slope-break zone and the third one is a structural slope-break zone.After analyzing the formation characters of subtle pools in these slope-break zones,it considered that the second slope-break zone is the most important belt for explorating subtle pools.