Relationship between strike-slip faults and petroleum in the central segment of the eastern subbasin of the Liaohe oilfield, China

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.