伊拉克M油田群碳酸盐岩中混积砂体预测研究

Prediction of mixed sand bodies in carbonate rocks of M Oilfield group in Iraq

M油田群碳酸盐岩混积砂体的石油地质储量大,但砂体横向变化快,给水平井设计和水淹层预测带来了较大的困难,因此需要利用地震反演预测砂体空间展布。针对常规岩石物理分析只能定性确定储层敏感参数的问题,基于岩性概率分布发展的定量岩石物理分析方法,可以较好地确定储层的识别率。然后,针对地震分辨率低和常规测井低频约束反演难以有效分辨薄砂体的难题,发展了测井宽频约束反演方法,模型和实例应用表明,该方法可以较好地分辨薄砂体,储层预测结果可以为开发方案制定提供有利技术支持。

The carbonate mixed sand body in M Oilfield group has large petroleum reserves,but the rapid lateral change of the sand body brings great difficulties to the horizontal well design and the prediction of water-flooded layer,so it is necessary to use seismic inversion to predict the spatial distribution of the sand body.To solve the problem that conventional rock physical analysis can only determine the sensitive parameters of reservoir qualitatively,a quantitative rock physical analysis method based on lithologic probability distribution was developed,which can better determine the identification rate and accuracy of reservoir.Then,in view of the problem of low seismic resolution and the difficulty of conventional logging low-frequency constrained inversion to effectively identify thin sand bodies,the logging broadband constrained inversion method was developed.The application of models and examples showed that the method can better identify thin sand bodies,and the reservoir prediction results can provide favorable technical support for the development plan.