• 应用地球物理学Ⅰ（油气及金属矿产地球物理勘探） •

### 基于最小平方的横波速度拟合及应用

1. 东北石油大学地球科学学院,黑龙江大庆 163318
• 收稿日期:2018-11-29 修回日期:2019-06-17 出版日期:2019-10-28 发布日期:2019-10-28
• 作者简介:王维红,男,1975年出生,教授,博士生导师,从事地震资料数字处理和勘探地球物理研究.(E-mail: 63230600@qq.com)
• 基金资助:
国家自然科学基金项目(41574117);国家自然科学基金项目(41474118);黑龙江省杰出青年科学基金项目(JC2016006)

### S-wave prediction and its application based on least square algorithm

WANG Wei-hong,BAO Pei-nan,CHEN Guo-fei,LIN Hong-zhe

1. School of Earth Sciences, Northeast Petroleum University, Heilongjiang Daqing 163318, China
• Received:2018-11-29 Revised:2019-06-17 Online:2019-10-28 Published:2019-10-28

Abstract:

Because of the P-wave impedance parameters obtained from post stack inversion, the reservoir and non-reservoir characteristics cannot be distinguished well and compared with poststack inversion, prestack inversion can obtain more elastic parameters to predict favorable reservoir spatial distribution characteristics, but shear wave data is the key factor of prestack inversion. Generally speaking, the shear wave data in the actual study area are very few, even missing. Under these circumstances, it is more important to predict shear wave data fromp-wave data or other logging data. And reconstructing shear wave information from conventional logging data is a widely used shear wave prediction technology. In this paper, the S-wave velocity prediction of all wells in S area of the Daqing oil field is completed based on the least square fitting polynomial method on the basis of comprehensive research and analysis. The comparison and analysis of six S-wave logging curves in the study area show that the average coincidence rate between the predicted S-wave and the measured S-wave is above 96%. The prediction accuracy of S-wave data can be effectively used for prestack inversion calculation of seismic data. Based on the predicted S-wave velocity, a low-frequency model is established, and the pre-stack simultaneous inversion calculation in S area is completed. The elastic parameter data obtained from inversion and logging data are compared and analyzed. The results show that the predicted elastic parameters obtained from inversion are in good agreement with the well data. The practice of seismic interpretation, reservoir prediction and development in S area of Daqing oilfield shows that prestack AVO/AVA inversion can improve the accuracy of reservoir prediction and reservoir identification, and then improve the accuracy of remaining oil prediction, and determine the key areas for tapping potential of remaining oil. The least square fitting method is used to complete the S-wave prediction, and the S-wave prediction formula suitable for the study area is given. The calculation shows that the method can be widely used in the study area of similar reservoirs.