Thin sand reservoir prediction of Putaohua oil layers in Punan area of Daqing Oilfield.
【摘要】 大庆油田葡南地区葡萄花油层的总厚度薄(10～30 m),单砂层具有薄、多、散、杂等特点,砂体厚度横向变化快,用常规的预测方法难以对单个砂体进行准确的描述。为此,在该区开展了基于模型的高分辨率薄互层反演技术进行砂体描述和储层预测的研究。根据葡南地区葡萄花油层的地质特点,选取了Jason多井约束反演技术;通过提高地震采样密度、测井曲线的标准化和精确层位标定等提高了地震资料的综合分辨率,降低了反演多解性;建立了接近实际地质条件的初始波阻抗模型,应用Jason反演方法获得了最终的波阻抗剖面,薄砂层得到了很好的反映,砂体减薄、尖灭等现象清晰,砂体展布特征清楚。利用波阻抗数据体进行了砂岩厚度和有效砂岩厚度预测,预测结果与钻井结果吻合较好。
【Abstract】 In Punan area of Daqing oilfield, the total thickness of Putao-hua oil layers is 10~30 m and the individual sand bodies are thin, dispersed, mixed, and transversally variable. Conventional methods can not predict individual sand body precisely. Therefore, the application of high-resolution thin-interbed inversion based on the model in sand body description and reservoir prediction has been studied. Jason inversion method was selected according to the geological features in Putaohua oil layers. By increasing the seismic sampling density, and adopting the log standardization and precise strata calibration, the general resolution of seismic data was increased while the ambiguity of inversion decreased. The initial wave impedance model similar to the real geology condition was established and the final impedance profiles were obtained through Jason inversion. In impedance profiles, thin sand layers are well reflected from the phenomenon of sand bodies becoming thinning and picking out is quite clear, and the distribution of sand bodies is very obvious. The impedance data volume was used to predict the sand thickness and the effective sand thickness, showing a good accordance with the drilling results.
- 【文献出处】 石油物探 ,Geophysical Prospecting for Petroleum , 编辑部邮箱 ,2007年02期