胜利油田YA地区三维地震资料AVO处理

Using AVO technology to process 3D seismic data from YA area of Shengli Oilfield

1. 胜利石油管理局物探研究院,东营257100;2. 同济大学,上海200092

Geophysical Academy of Shengli Petroleum Administration, Dongying 257100

近几年,胜利油田一直在进行利用AVO技术寻找天然气藏的研究,但由于资料所限(二维AVO分析),并没有取得太大的进展。针对这种情况,我们选择了胜利油田主要天然气产区之一的YA地区进行了三维地震资料的AVO处理研究。从已知气藏入手,对三个典型气藏进行了正演模型研究;进行了实际资料的处理(道集处理与三维AVO处理),得到了分偏移距叠加数据体、分角度叠加数据体、三维AVA数据体和三维碳氢检测等属性体,将这些数据体进行三维可视化解释,可以准确确定已知气藏及异常区的空间展布范围,使AVO技术实现了从二维到三维的转化。

In recent years, Shengli oilfield has being undertaking the research on AVO technology for detection of gas reservoirs. Because of the data limitations (2D AVO data), the research has made little progress. To counter this situation, researches on 3D AVO data processing were carried out for data from YA area, one of the major gas producing areas in Shengli Oilfield. Forward modeling on 3 typical gas reservoir was performed. Real data was processed(processing for gathers and 3D AVO attributes) to obtain stacked data volumes of various offsets and angles, 3D AVA data volumes as well as 3D hydrocarbon detection attribute volumes. The spatial distributions of the known gas reservoirs and their anomalous regions were determined by using 3D visualization on these volumes, thus AVO technology is converted from 2D to 3D. Combining the features and classifications of the known gas reservoirs, the distinct characteristics of the major gas reservoirs in YA area were inferred.