The diapir structure newly defined in Doshan area

South Turgai Basin is a typical duplex structure.The lower carbonate diapir superimposes on the deeper one

and maintains the consistency of structural configuration with that of the latter at the same time.These small-scale diapir structures are generally on NW-SE trend.They are recognized as deep-source diapirs based on their regional stress background

plastic deformation

and pyrolysis gas show.Their development is mainly controlled by the upswelling of deep materials along small-scale faults due to the revitalization of deep base paleo-faults during the Late Cretaceous large-scale strike-slipping and uplifting deformation in southern Turgai Basin.The discovery of this kind of structures not only provides a new mode of tectonic research

but also a new domain of petroleum exploration in southern Turgai Basin.Diapir structures located in slope-burial hill belt have favorable accumulation conditions

and are favorable targets for discovering structural and/or lithologic hydrocarbon reservoirs.