【摘要】 盆地深部基底的地震解释需要时深尺.而钻遇基底的探井通常很少且仅揭示基底顶部,致使常规VSP时深转换曲线难以达到基底研究所涉及的深度.为此本文提出深部下延段校正的VSP时深转换方法,即用深井和钻遇基底井VSP数据与深反射地震、双船折射地震和重磁数据在深部下延段选取控制点的时深数据,重新拟合时深转换的二次多项式,使其可用于深部地震解释.将珠江口盆地分为深水区(>300 m)和浅水区(<300 m)分别进行水深修正时深拟合.用克里金法对两区同一基准面的等深线进行插值,最终完成全区的时深转换,并藉此编制出全区基底顶面埋深图.更多还原

【Abstract】 Seismic geological interpretation of deep-seated basement needs time-depth relation. The wells reaching basement are very few and they only reveal basement top,which causes time-depth conversion unable to reach the desired depth.This paper proposes a VSP time-depth conversion correction in the depth,it fits quadratic polynomial of time-depth conversion for VSP data of deep wells and basement-penetrating wells,deep seismic reflection,ESP and gravity and magnetic data in deep-seated strata,to be applied for seismic interpretation in deep-seated strata. The paper fits time-depth chart by dividing deep water area (>300m) and shallow water area (< 300m).Finally it completes time-depth conversion of the whole area,and compiles the burial depth of basement top surface of the whole area by using kriging to interpolation of the isobath of the same base level of two areas.更多还原