Research on recovering unconformity denudation and distribution regularity in Xushen gas field

By using deposition fluctuation process analysis method,denudation recovering computation was conducted aiming at primary unconformity existing in shallow sedimentary rock,glutenite in division four and volcanic rock in division one of Yingcheng block.Comparing with acoustic travel time logging method and discontinuous vitrinite reflectance method,it is concluded that using de-position fluctuation process analysis mehtod to identify the unconformity and to perform denudation recovering computation is feasible for deep-zone volcanic rock in Xushen gas field.Denudation generally occurred at middle and later period of Yanshan Movement as well as early stage of Himalayan Movement.But denudation at later middle period was relatively weak.The denudation has close relation with volcanic action and mirrors the change of depositional pattern in basin structure.This finding contributes to the further study on natural gas reservoiring regularity.