琼东南盆地深水区频率域油气检测技术研究及应用

刘仕友; 孙万元; 邓勇; 廖键; 汪锐

doi:10.3799/dqkx.2019.087

琼东南盆地深水区频率域油气检测技术研究及应用

doi: 10.3799/dqkx.2019.087

中海石油(中国)有限公司湛江分公司, 广东湛江 524057

基金项目:

国家重大专项：琼东南盆地深水区大中型气田形成条件与勘探关键技术 2016ZX05026-02

详细信息

作者简介:
刘仕友(1982-), 高级工程师, 主要从事储层预测和烃类检测研究

中图分类号: P588
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出版历程
- 收稿日期: 2019-01-16
- 刊出日期: 2019-08-15

Research and Application of Oil and Gas Detection Technology in Frequency Domain in Deep Water Area of Qiongdongnan Basin

Zhanjiang Branch Company of CNOOC(China) Ltd., Zhanjiang 524057, China

摘要

摘要: 随着琼东南盆地勘探扩展到深水区勘探，勘探面临较大的水深差异的影响.不同目标含油气评价受制于埋深、水深差异影响，振幅属性可类比性差；仅用振幅类属性，比如亮点技术、反演技术，识别油气具有较大局限.以双相介质理论为基础，探究双相介质条件下含油气层地震波特征，发现含油气层的强衰减造成地震主频向低频移动的现象.应用匹配追踪和高分辨率Wigner分布时频分析方法，精确分析地震波经过含油气层前后频谱差异，应用频移特征属性进行含油气检测，在琼东南盆地深水区勘探取得较好的应用效果，同时，该技术不依赖于测井数据等因素，具有极大的推广应用前景.
- 双相介质 /
- 频移 /
- 时频分析 /
- 深水区 /
- 烃类检测 /
- 石油地质
Abstract: With the extension of exploration in Qiongdongnan(QDN) Basin to deep water area,the seismic data amplitude is poorly preserved due to the large variation of water depth and the influence of spherical diffusion compensation,etc.The evaluation of oil and gas in different targets is affected by the difference of burial depth and water depth,and the analogy of amplitude attribute is poor. There are so many limitations in hydrocarbon detection only by bright spots technique.This paper is based on the theory of dual-phase medium.The seismic wave characteristics of oil and gas bearing reservoirs are explored.The strong attenuation of oil and gas reservoirs causes the seismic main frequency from high frequency to low frequency.Time-frequency analysis is using matching pursuit and high resolution Wigner distribution.Through accurate analysis of seismic wave spectrum difference before and after passing through oil and gas reservoirs,and application of main frequency shift characteristic attributes for oil and gas detection is obtained. Good exploration effect in deep water area of QDN Basin is achieved.At the same time,the technique does not depend on logging data and other factors,so it has great application prospects.
- dual-phase medium /
- frequency shift /
- time-frequency analysis /
- deepwater /
- hydrocarbon detection /
- petrolum geology

HTML全文

图 1 琼东南盆地构造

Fig. 1. Structural map of QDN Basin

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图 2 双相介质波场模拟

a.正演模型；b.固相波场快照；c.流相波场快照

Fig. 2. simulation of dual-phase medium

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图 3 双相介质地震波特征

a.横向分量；b.纵向分量

Fig. 3. Seismic wave characteristics of dual-phase medium

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图 4 双相介质与单相介质地震波能量特征对比

Fig. 4. Comparison of seismic wave energy characteristics between dual-phase and single-phase media

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图 5 双相介质地震波频谱特征

红色.双相介质；蓝色.单相介质; 点线.双相介质地震频谱；直线.子波频谱

Fig. 5. Spectrum characteristics of seismic waves in dual-phase media

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图 6 合成地震记录

Fig. 6. The synthetic seismogram

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图 7 不同方法时频谱分析对比

a.短时傅里叶变换时频谱；b.小波变换时频谱；c.匹配追踪Wigner分布时频谱

Fig. 7. Comparison of different time-frequency spectrum analysis methods.

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图 8 含气层顶底界面时频谱

Fig. 8. Time-frequency spectrum of top-bottom interface of gas-bearing formation

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图 9 主频偏移特征

a.纯波地震剖面; b.主频剖面; c.频移特征

Fig. 9. Main frequency shift characteristics

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图 10 琼东南L5探区频移、振幅特征对比

a.频移特征; b.振幅特征

Fig. 10. Application of main frequency shift in a exploration area in QDN

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