西南石油大学学报(自然科学版)

• 地质勘探 • 上一篇    下一篇

琼东南盆地LS 区近道地震反射性质研究及意义

应明雄*,陈殿远,刘建英,刘仕友,陈祖银   

  1. 中海石油(中国)有限公司湛江分公司,广东湛江524057
  • 出版日期:2016-06-01 发布日期:2016-06-01
  • 通讯作者: 应明雄,E-mail:yingmx@cnooc.com.cn
  • 基金资助:

    国家十二五重大专项(2011ZX05025 002 06)。

The Nature and Significance of Shortcut Seismic Reflection in#br# the LS Area in Qiongdongnan Basin

YING Mingxiong*, CHEN Dianyuan, LIU Jianying, LIU Shiyou, CHEN Zuyin   

  1. Zhanjiang Branch Company,CNOOC China Ltd.,Zhanjiang,Guangdong 524057,China
  • Online:2016-06-01 Published:2016-06-01

摘要:

针对目标区叠前地震道集表现为中远偏移距频率较低,近偏移距频率较高,高频成分随偏移距增大能量衰减
较快的特点,开展了叠前速度谱分析、近道相关分析以及井数据正演模拟对比分析,排除了近偏移距高频能量反射是
多次波的可能性。由于目标区薄互层储层分布受调谐效应影响,常规AVO 分析无法有效进行油气检测。在正演模拟
识别储层组合特征的基础上,对叠前道集进行分频处理,消除近道薄层反射影响后,对目标进行AVO 分析,最终井震
匹配,证实了分频AVO 技术在该地区的适用性,也为薄互层储层烃检提供了一种新思路。同时,利用近道薄层反射进
行优势道叠加,新生成的叠加数据体主频明显提高,储层AVO 效应减弱,流体信息增强,从而明显提高了横向和纵向
上的预测精度,显示了优势道叠加技术在该区储层流体预测中的适用性。

关键词: 近道反射, 多次波, 正演模拟, 分频AVO, 优势道叠加

Abstract:

The prestack seismic in COSCO offset gathers low frequency(frequency of 25 Hz),near offset gathers on the performance
of high frequency(frequency reached 45 Hz),and the high-frequency signal attenuates rapidly along offset direction.
We made analysis of prestack speed spectrumand of shortcut;we also carried out forward modeling of drilling data and did a
comparative analysis. The results exclude the possibility of multiple waves of strong near-offset-frequency energy reflection.
As the thin interbedded reservoir distribution in the target area is under the influence of tuning effects,AVO analysis cannot
accurately detect hydrocarbon reservoir. After identifying combinations of reservoir characteristics by forward modeling,we
eliminated the reflective effect of short cut thin bed,and then made AVO analysis of the target area,and finally achieved well
seismic match,which also verified frequency dependent AVO technique is applicable in the region. Besides,we significantly
improved the main frequency of the data after dominant channel stacking,thus improved the accuracy of reservoir prediction
in the horizontal and vertical directions. The results proves the applicability of AVO analysis technology in the target area.

Key words: shortcut reflection, multiple wave, forward modeling, frequency dependent AVO, dominant channel stacking

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