东濮凹陷地震速度场建立方法与应用研究  

A Method for Establishing Seismic Velocity Field and Its Application in Dongpu Sag

作　　者：汪功怀[1] 秦广胜[1] 蔡其新[1] 

机构地区：[1]中国石化中原油田分公司物探研究院,河南省濮阳市457001

出　　处：《中国石油勘探》2011年第2期58-66,88,共9页China Petroleum Exploration

摘　　要：由于东濮凹陷勘探目标更加隐蔽和复杂,对地震勘探精度的要求越来越高,提出叠加/偏移速度联合反演求取层速度的新方法,提高了层速度计算精度。通过研究速度场建立方法,形成了利用地震速度、测井、钻井和构造层位等多种信息联合建立速度场技术,获得了反映速度宏观分布规律并与井符合良好的速度场。结合地震速度的概念和具体应用,明确了各种速度类型之间关系及其适用性,为地震勘探各阶段提供了较全面的速度场方案。完成东濮凹陷全区的地震速度数据坐标定位和统一格式转换,建成了全区速度库,为地震成像、变速成图、区域地层压力预测等提供了技术支持,并获得了良好效果。Seismic exploration accuracy meets higher and higher requirements since the exploration targets in Dongpu Sag tend to be more subtle and complicated.For this,this paper puts forward a new method for acquiring horizon velocity based on joint inversion of stack velocity and migration velocity,improving the accuracy of velocity calculation.Through study on methods for establishing velocity field,the technology of establishing velocity field on the basis of combining such information as seismic velocity,logging,drilling and structural horizon is developed,and the velocity field reflecting the macroscopic law of velocity distribution is obtained,which is in good agreement with the well.Integrating the concept and application of seismic velocity,this paper defines the correlation of various types of velocity and its applicability,providing a complete velocity field solution for different phases of seismic exploration.Based on coordinate positioning and unified format transformation of seismic velocity data,the velocity base of all over Dongpu Sag is established,supporting seismic imaging,variable velocity mapping,and prediction of regional formation pressure technically,and yielding good results.

关 键 词：速度场 层速度 地震成像 变速成图 东濮凹陷 

分 类 号：P631.44[天文地球—地质矿产勘探]