辽河油田东部凹陷中段走滑断层与油气的关系
Relationship between strike-slip faults and petroleum in the central segment of the eastern subbasin of the Liaohe oilfield, China
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摘要: 走滑构造不仅加速含油气盆地油气的运移和富集，而且在促使油气圈闭的形成过程中也促使形成圈闭中的优良储集层。在具备生、储、盖地质条件时，花状构造样式的含油气性优于其他构造样式，不仅控制着油气藏的分布，而且走滑断层的应力释放区往往是油气富集区。扭应力作用使生油层中的分散油气被“强拧”驱赶、运移至花状构造背斜核部，在负花状构造的上升盘中形成高产油气流。辽河坳陷内的黄沙坨和欧利坨子地区便是郯庐断裂在辽河坳陷东部凹陷中段的应力释放区，对该区走滑断层的识别和解释，不仅对东部凹陷中段油气藏的形成、分布及富集有了新的认识，而且可为寻找同类油气藏提供依据。Abstract: Not only strike-slip structures can accelerate petroleum migration and accumulation in petroleum-bearing basins, but wrench faults can also form good reservoirs during the formation of traps. When the source, reservoir and seal conditions are available, the hydrocarbon potential of flower structure is superior to that of other structural styles because flower structure not only controls the distribution of petroleum accumulations, but also the site of stress release in the strike-slip fault is usually the site of petroleum gathering. The wrench stress drives dispersed petroleum in source rocks to the core region of the flower-shaped anticline, which forms productive oil and gas flow in the upthrown block of negative flower structures. Huangshatuo and Oulituozi are sites of stress release in the central segment of the eastern subbasin of the Liaohe depression of the Tanlu fault. Recognizing and interpreting the strike-slip faults in the study area may make us have a new understanding of the formation and distribution of the accumulations in the central segment of the eastern subbasin, but also provide a basis for finding the same kind of petroleum accumulations.
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Keywords:
- Liaohe oilfield /
- strike-slip fault /
- Tanlu fault /
- flower structure /
- Huangshatuo /
- Oulituozi /
- petroleum trap
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