泌阳凹陷南部陡坡带断裂与局部构造特征

泌阳凹陷是一个南断北超的箕状凹陷。其南、东两侧分别被两组断裂所限。因此南部陡坡带断裂的产生和发展，对凹陷的局部构造具有直接的影响。并控制了油气的运聚和分布。通过对断裂构造的分析，认为南部局部构造的形成是边界北西向和北东向大断裂伸展、走滑、挤压的结果。在伸展-走滑关联断裂作用下，南缘陡坡带断层转换处沿下降盘地层依次可形成左旋左阶雁列式排列的与边界断裂呈锐角关系的鼻状或背斜同沉积构造，在东缘可形成“花状”走滑构造。这些局部构造是油气优先聚集的有利场所，而成为油气勘探的主要目标。

Characteristics of Steep Slope Fault and Its Local Structure in the South of Biyang Depression

Biyang Depression is a half depression with fault in the south and override in the north, its south and east sides are constrained by 2 groups of faults, thus the local structure of depression is directly influenced by the creation and development of the southern steep slope faults, by which the hydrocarbon migration and accumulation and its distribution are controlled. It is considered by analysis that the formation of the southern local structure is the outcome from extension, strike slippage and compression caused from west-north and east-north big faults. Under the force of extension-strike slippage correlated fault, left-hand and left-order echelon nose-like or anticline apposition structures in sharp angle with the boundary are created orderly in the conversion position along the downthrow of south margin, in the eastern margin a flower-like strike-slip structure can be formed. These local structures are the beneficial locations for optimal hydrocarbon accumulation, thus to provide major targets for hydrocarbon exploration.