摘要
研究区位于深水低勘探区,崎岖海底等普遍存在,受地震、钻井和速度等资料条件的限制,只能采用去海水的拟合公式法进行时深转换。然而去海水拟合公式法时深转换会因崎岖海底而造成假构造现象,且常规的崎岖海底填平校正方法存在一定的不足。用去海水拟合公式法计算出时转深层位,并比较时转深层位与深度域地震资料的横向构造形态变化,引入了构造形态相似率的概念,建立了崎岖海底填平量化评分模板来对崎岖海底进行填平校正,最后根据最高得分值来确定最佳平滑网格的海底和合适的时转深层位,在一定程度上消除了崎岖海底造成的假构造现象和支持了构造成图的需求。
The time-depth conversion faces many difficulties in some special conditions,such as rugged seabed,deep-water and the areas of low exploration degree,owing to the deficiency in seismic,shallow drilling and improper velocity data.The fitting formula by removing water depth was the only method for time-depthconversion.However,the practice may lead to pseudo-structures because of rugged seabed,and the conventional correction method by filling up the sea bottom has similar shortcomings.The method used in this paper calculate the timetcrdepthhorizon first,and then compare the horizons in depth-domain for the change in the transverse structures.This method introduced in the concept of structure similarity rate andquantitative templates arebult up for filling up the sea bottom for correction of the rugged seabed.Based on the highest score value,the suitable sea bottom and timeto-depth horizons are determined.To some extent,it can eliminate the pseudo-structures caused by rugged seabed and better support the requirements of structural mapping.
作者
饶溯
胡滨
RAO Su;HU Bin(CNOOC International Energy Services(Beijing)Co.,Ltd.,Beijing 100028,China)
出处
《海洋地质前沿》
CSCD
2019年第12期66-73,共8页
Marine Geology Frontiers
关键词
深水
低勘探区
时深转换
构造形态相似率
崎岖海底
假构造现象
deep-water
low exploration degree area
time-depth conversion
structural similarity rate
rugged seabed
pseudostructural phenomena
