用模拟退火算法作叠后层速度计算

Poststack interval velocity estimation by simulated annealing algorithm

1. 江苏油田地调处南京计算中心, 南京210046;2. 地矿部石油物探研究所, 南京210014

Nanjing Computer Center, Gcological Survey Division of Jiangsu Oil Field, Nanjing City, Internal Postcodc: 210046

本文改进了Frazer的模拟退火法计算层速度的算法, 采用褶积模型计算了正演合成记录, 并用L₁模定义误差能量。理论模型和实际地震处理表明, 本方法是行之有效的, 提取的地震层速度是可靠的。本文提供的算法快速稳健, 能减少目标函数的多解性。

This paper presents a modified version of the Frazer's simulated annealing method for calculating interval velocities. The synthetic seismograms are forward calculated using a convolution model, and the error's energy is defined using the L₁ norm. Theoretical modeling and practical seismic processing show that such method is effective and the resultant interval velocities are reliable. In addition to the rapidity and robustness, the method has another distinguishing feature of reducing the ambiguity for objectivc functions.