笔架岭构造带反向正断层与油气聚集关系研究

Antithetic Normal Fault and Its Relation to Oil & Gas Accumulation in Bijialing Structural Zone

从地质特征入手，探讨本区北东向反向正断层的形成机制及与油气聚集的关系，指出下一步的勘探方向。研究认为，北东向反向正断层的形成受北西—南东向张应力及右旋剪切力作用控制，反向正断层的走向与张应力方向基本垂直；反向正断层封堵性能的好坏与断面力学性质有关，相对挤压区有利于油气聚集，油气主要分布在主干断层的弧弯部位内侧；下一步的勘探方向应放在向海南洼陷过渡的斜坡部位，在寻找构造油气藏的同时注意寻找沙河街组岩性油气藏。

Based on the geologic characteristics of Bijialing area, this paper discusses the producing mechanism of eastnorth antithetic normal fault and its relations to oil & gas accumulation, while points out the direction of next exploration. The formation of antithetic normal fault is controlled by WN-ES direction tension stress and right-hand shear stress, the strike is nearly vertical to tension stress, its sealing behaviors are related to the mechanical properties of fault plane. The relative compression area is advantageous to oil & gas gathering; Almost oil & gas pools distribute inside of major faults arc area; The object of next exploration phase should be concenttated on the slope zone toward Hainan source sag, because there are perhaps not only a large amount of structural pools but also lithological pools in this area.