Fractured reservoir prediction on narrow azimuth seismic data
Su Shilong1,2, Hu Dan2, Huang Zhi3, He Zhenghua1, Wang Jiushuan2, Li Hong2
1. State Key Laboratory of Oil & Gas Reservoirs Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
2. GRI, BGP Inc., CNPC, Zhuozhou, Hebei 072750, China;
3. Research & Development Center, BGP Inc., CNPC, Zhuozhou, Hebei 072750, China
Abstract：Field tests and theoretical researches show that fracture anisotropy has influence on seismic wave propagation characteristics. So narrow azimuth seismic data can be processed with azimuth approaches, and interpreted to predict fractured reservoir. In this paper, this proposed approach is applied to narrow azimuth seismic data in M area to predict fracture development zones. The following techniques are involved: ①Sub-azimuth seismic data are evenly distributed in different azimuth by azimuth dividing; ②During data regularization, 5 D interpolation or OVT domain processing approaches are adopted to for better azimuth anisotropy analysis and fracture prediction; ③The pre-stack time migration velocity field for full azimuth data interpretation is adopted as the final pre-stack time migration velocity field for selected azimuth data; ④Fracture orientation, density and distribution are quantitatively identified and characterized with AVA, and they are qualitatively identified and characterized with attribute analysis. Results show that the fracture direction identified with attribute analysis on poststack data matches very well with regional geology and drilling data, and the fracture development identified with attribute analysis on prestack data are consistent with non zero offset VSP interpretation results.
苏世龙, 胡丹, 黄志, 贺振华, 王九拴, 李虹. 窄方位角地震数据预测裂缝储层方法[J]. 石油地球物理勘探, 2015, 50(3): 510-515.
Su Shilong, Hu Dan, Huang Zhi, He Zhenghua, Wang Jiushuan, Li Hong. Fractured reservoir prediction on narrow azimuth seismic data. OGP, 2015, 50(3): 510-515.
Tian Lixin,Zhou Donghong,Ming Jun et al.Application of narrow-azimuth seismic data to fractured reservoir prediction.Journal of Chengdu University of Technology,2010,37(5):550-553.
[3]
Rüger A.Variation of P-wave reflectivity with offset and azimuth in anisotropic media.Geophysics,1998,63(3):935-947.
[4]
贺振华, 黄德济, 文晓涛.裂缝油气藏地球物理预测.四川成都: 四川科学技术出版社, 2007.
[5]
贺振华, 黄德济.缝洞储层的地震检测和预测.勘探地球物理进展, 2003, 26(2): 79-83.He Zhenhua,Huang Deji.Detection and prediction offracture cave contained reservoir from seismic data.Progress in Exploration Geophysics,2003,26(2):79-83.
Su Shilong,Wang Yongming,Huang Zhi.Application of two data regularization in seismic data processing. Progress in Exploration Geophysics,2010,33(3):200-206.
He Xilei,Wu Yongguo,He Zhenhua.Error estimation in time and depth migrations with error velocity.Computing Techniques for Geophysical and Geochemical Exploration,2010,32(5):460-463.
