Application of offshore 3D dual-azimuth seismic data processing to the Panyu 4 Sag

BAI Haijun; YUAN Yang; YANG Dengfeng; ZHAO Chao; CAI Guofu

doi:10.16028/j.1009-2722.2021.181

2022 Vol. 38, No. 3

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Article navigation > Marine Geology Frontiers > 2022 > 38(3): 82-88

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BAI Haijun, YUAN Yang, YANG Dengfeng, ZHAO Chao, CAI Guofu. Application of offshore 3D dual-azimuth seismic data processing to the Panyu 4 Sag[J]. Marine Geology Frontiers, 2022, 38(3): 82-88. doi: 10.16028/j.1009-2722.2021.181

Citation:

BAI Haijun, YUAN Yang, YANG Dengfeng, ZHAO Chao, CAI Guofu. Application of offshore 3D dual-azimuth seismic data processing to the Panyu 4 Sag[J]. Marine Geology Frontiers, 2022, 38(3): 82-88. doi: 10.16028/j.1009-2722.2021.181

Application of offshore 3D dual-azimuth seismic data processing to the Panyu 4 Sag

Research Institute of Shenzhen Branch of CNOOC (China) Ltd., Shenzhen 518000, China

Received Date: 29 July 2021

Publish Date: 28 March 2022

Abstract

Abstract

The study area, Panyu 4 Sag, occurs in the northern part of the Pearl River Mouth Basin where Neogene NWW-strike normal faults are well developed. The traps on the upside of those faults are important targets for hydrocarbon exploration. However, the first round of 3D seismic data of this area, which is parallel to the direction of fault strike, provides poor images in fault shadow zones, with low signal-to-noise ratio, abnormal event dropping down and strong structural distortion. Thus traps on the upside of normal faults always bear structural uncertainties in data interpretation. For this reason, a second round of 3D seismic is performed vertical to fault strike and fault shadow imaging is improved compared to the first round of 3D seismic. In order to further improve the fault shadow imaging, the dual-azimuth processing considering azimuthally anisotropic is employed using both of the 3D seismic datasets. The core of the dual-azimuth processing is the dual-azimuth anisotropic PSDM. By comparison of the dual-azimuth anisotropic PSDM results and the PSDM results using either of the single azimuth, it is found that the seismic data which is acquired vertical to the fault strike is more suitable for fault shadow imaging. What’s more, the dual-azimuth data shows the best illumination in fault shadow, as well as the highest signal-to-noise ratio. The reliability of the dual-azimuth data is demonstrated by the drilling results of the evaluation wells in the fault shadow zone. At the same time, some references on seismic acquisition design and data processing flow can be provided for solving the imaging problem of fault shadow zone in similar areas.
- Panyu 4 Sag /
- the second 3D seismic acquisition /
- azimuthally anisotropic /
- dual-azimuth processing /
- anisotropic PSDM

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References

[1]	刘从印,周平兵,曾驿,等. 番禺4洼地区新近系油气成藏主控因素分析[J]. 中国海上油气,2009,21(2):91-94. doi: 10.3969/j.issn.1673-1506.2009.02.004 CrossRef Google Scholar
[2]	FAGIN S. The fault shadow problem:its nature and eli-mination[J]. The Leading Edge,1996,15(9):1005-1013. doi: 10.1190/1.1437403 CrossRef Google Scholar
[3]	BRIDUS S. Removing fault shadow distortions by fault-constrained tomography[C]. Expanded Abstracts of 77^th SEG Ann. Mtg. , 2007: 3039-3043. Google Scholar
[4]	徐敏,杨晓,王静,等. 叠前深度偏移技术在复杂断块井位目标优化中的应用[J]. 中国石油勘探,2015,20(3):73-78. Google Scholar
[5]	潘兴祥,秦宁,曲志鹏,等. 叠前深度偏移层析速度建模及应用[J]. 地球物理学进展,2013,28(6):3080-3085. Google Scholar
[6]	彭海龙,邓勇,郝建伟,等. 基于断层与层位约束的3D速度建模方法在消除断层阴影中的应用研究[J]. 地球物理学进展,2017,32(6):2520-2526. doi: 10.6038/pg20170632 CrossRef Google Scholar
[7]	ARNTSEN B, THOMPSON M. The importance of wide azimuth in imaging[C]. Expanded Abstracts of 65^th EAGE Ann. Mtg., 2003: A-40. Google Scholar
[8]	HARDWICK A, RAJESH L. A 3D illumination study to investigate fault shadow effects over the Hoop Fault Complex[C]. Expanded Abstracts of 75^th EAGE Ann. Mtg., 2013: 3315-3318. Google Scholar
[9]	刘依谋,印兴耀,张三元,等. 宽方位地震勘探技术新进展[J]. 石油地球物理勘探,2014,49(3):596-603. Google Scholar
[10]	杜向东. 中国海上地震勘探技术新进展[J]. 石油物探,2018,57(3):321-331. Google Scholar
[11]	朱江梅,李列,杨薇,等. 多方位角地震资料在文昌凹陷勘探开发中的应用分析[J]. 地球物理学进展,2013,28(5):2587-2596. Google Scholar
[12]	朱明,何敏,张振波,等. 海上二次三维双方位地震资料联合成像[J]. 中国海上油气,2016,28(6):15-20. Google Scholar
[13]	KEGGIN J, MANNING T, RIETVELD W, et al. Key aspects of Multi-Azimuth acquisition and processing[C]. Expanded Abstracts of 76^th SEG Ann. Mtg., 2006: 2886-2890. Google Scholar
[14]	谢涛,邱铁成. 双方位地震资料处理技术及在M区块的应用[J]. 工程地球物理学报,2019,16(3):329-333. doi: 10.3969/j.issn.1672-7940.2019.03.010 CrossRef Google Scholar
[15]	李列, 盖永浩, 欧阳敏, 等. 南海西部双方位地震资料处理关键技术实践: 以珠三凹陷为例[J], 地球科学, 2019, 44（8）: 2590-2596. Google Scholar
[16]	TSVANKIN L. Anisotropic parameters and P-wave velocity for orthorhombic media[J]. Geophysics,1997,62(4):1292-1309. doi: 10.1190/1.1444231 CrossRef Google Scholar
[17]	GRECHKA V,TSVANKIN L. 3-D moveout velocity analysis and parameter estimation for orthorhombic media[J]. Geophysics,1999,64(3):820-837. doi: 10.1190/1.1444593 CrossRef Google Scholar
[18]	GRECHKA V,TSVANKIN L. Seismology of azimuthally anisotropic media and seismic fracture characterization[J]. The Leading Edge,2011,10(3):154-155. Google Scholar
[19]	BALL G. Estimation of anisotropy and anisotropic 3-D prestack migration,offshore Zaire[J]. Geophysics,1995,60(5):1495-1513. doi: 10.1190/1.1443883 CrossRef Google Scholar
[20]	VESTRUM R W,LAWTON D C,SCHMID R. Imaging structures below dipping TI media[J]. Geophysics,1999,64(4):1239-1246. doi: 10.1190/1.1444630 CrossRef Google Scholar
[21]	凌云,郭向宇,孙祥娥,等. 地震勘探中的各向异性影响问题研究[J]. 石油地球物理勘探,2010,45(4):606-623. Google Scholar
[22]	白海军,孙赞东,李彦鹏,等. 3D VSP共检波点道集各向异性分析及参数提取[J]. 石油地球物理勘探,2011,46(S1):53-59. Google Scholar
[23]	李振伟,全心怡,张天炬,等. TTI各向异性速度建模在涠西南探区的应用研究[J]. 海洋石油,2019,39(3):21-26. Google Scholar