徐深气田不整合剥蚀量恢复及分布规律研究

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

应用沉积波动过程分析法,针对徐深气田中浅层沉积岩、营城组四段砂砾岩、营城组一段火山岩等地层主要不整合开展了剥蚀量恢复计算,对比声波时差测井法、不连续镜质体反射率法剥蚀量恢复,认为利用沉积波动过程分析法识别不整合和进行剥蚀量恢复计算对于徐深气田深层火山岩是可行的。区域构造抬升剥蚀阶段主要发生在燕山运动中期早期、燕山运动晚期、喜玛拉雅运动早期。燕山运动中期的中晚期抬升剥蚀相对较弱。剥蚀量与火山作用关系密切,反映了盆地构造沉积格局的变化。研究结果可为深入开展天然气成藏规律研究奠定基础。

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.