天然地震与构造裂缝、油气运移的关系研究

天然地震是地壳在应力作用下岩石快速破坏的结果，构造裂缝、断裂的形成（或断层的再活动）与天然地震关系密切。震源应力场是构造应力场不可分割的一部分。构造裂缝与断裂形成是同一构造应力场演化不同阶段的物质表现。可以根据天然地震的研究成果来研究构造裂缝，分析构造裂缝发育的时间、位置、分布范围以及发生的频率。构造裂缝连通性好，穿越性强，是油气运移的重要通道。平行于最大水平主应力方向的构造裂缝，及与最大水平主应力呈小角度相交的前期断层和裂缝是油气运移的优选方向。

The relations among the natural earthquake and structural fracture and oil-gas migration

Earthquake forms when crust under the stress is damaged promptly. The formation of structural fracture and fault (or fault remobilization) is closely related to the earthquake. The stress field of earthquake source is a part of tectonic stress field. The formation of structural fracture and fault is the result of evolution of tectonic stress field. Based on the research of earthquake and the forming time, the tectonic location, distribution and frequency of fracture can be studied. It can be concluded from the research that structural fracture has the best communication , which is the important pathway for the migration of hydrocarbon. The structural fracture parallel in direction to the maximum principal stress and the previous fault and fracture intersecting with the maximum principal stress at a small angle are the preferential directions of hydrocarbon migration.