FRACTURE DEVELOPMENT PREDICTION BASED ON AZIMUTHAL ANISOTROPY ANALYSIS OF PRE-STACK SEISMIC-TAKE XUJIAHE FORMATION OF PUGUANG GAS FIELD FOR EXAMPLE
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摘要:
本文首先建立正演模型，根据普光北部陆相须家河组地层特有岩性特征，针对不同角度裂缝进行模拟，得到沿裂缝方向振幅随着偏移距的增大而减小的规律；然后对叠前地震资料进行面元规则化、速度分析和叠前时间偏移叠加等处理，使之符合裂缝预测的要求；最后通过振幅随方位角的变化、频率属性随方位角的变化分析，反演得到须家河组储层裂缝走向和密度的数据体。以裂缝预测结果为指导，部署普陆1-2H井，并取得了良好的预期效果。
Abstract:In the beginning of this paper, the forward model is established and stimulation is carried out on the fractures from different angles according to the unique lithology characteristics of Xujiahe formation in North Puguang. In view of the different point of azimuthal to simulate the fracture, the rule is summed up that along the direction of the fraction the amplitude of the fraction reduces as the offset increases.Then, the pre-stack seismic data is processed.The velocity analysis and the pre-stack time migration stack are processed to meet the requirement of fracture prediction.Finally, based on the analysis of the variations the amplitude with azimuth and the analysis of the variations the frequency with azimuth, through invesion, the data cubes of strike direction and the density of reservoir fractures are obtained. Guided by the fracture prediction, Pulu1-2H Well was deployed, and a good anticipated effect was achieved.
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Key words:
- Puguang gas field /
- Xujiahe formation /
- pre-stack seismic /
- fracture prediction
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