为什么二、三级断层对油气聚集起控制作用──复杂断块油气田形成条件系列论文之四

二、三级断层与四级断层最重要的差别在其发育的长期性和继承性。油气移聚期开始后，发育中的断层的封闭性将活跃地转化，引起强烈的再运移。如果邻近有多条正在发育中的断层，则在显著扩大油气波及范围的同时，将大大增加油气运移过程和途径的复杂性，引起油气分布和富集在纵、横方向的不平衡性和随机性以及断块区之间含油特点的差异。

The Controlling Mechanism of Second or Third-Class Faults on Hydrocarbon Migration and Accumulation

The most important difference between the 2nd~3rd class fault and 4th class one is their long term and heritable development. After the starting of hydrocarbon migration,sealing characteristics of developing fault changes actively and leads to strong remigration in the same period. If some neighbouring faults are developing,the distribution space of hydrocarbon will be distinctly enlarged; migration process and path will be distinctly complicated,accompanying with distinct randomization of Iateral and vertical distribution of hydrocarbon. The districts are divided by 2nd~3rd class faults,they always have distinct difference in enrichment, productive horizon and other oil-bearing aspects.