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地下裂缝是油气聚集和运移的重要通道,而裂缝岩石物理是裂缝参数与地震响应之间联系的桥梁.从裂缝岩石物理出发,探索利用地震数据预测地下裂缝的方法.首先通过构建裂缝岩石物理等效模型,弥补测井横波的缺失,并且实现裂缝岩石物理参数的预测;然后推导了裂缝岩石物理参数与地震响应之间的近似关系式,同时探索裂缝岩石弹性参数和岩石物理参数的地震直接反演方法;最后分别利用测井数据和实际工区地震数据对裂缝岩石物理等效模型的可靠性以及裂缝岩石物理参数直接反演方法的精度进行了验证.结果表明,构建的裂缝岩石物理等效模型可以实现裂缝岩石纵横波速度及岩石物理参数的可靠估测,而且裂缝岩石物理参数地震直接反演方法具有较高的抗噪性,在实际目标工区弹性参数和裂缝岩石物理参数的估算中具有较好的应用结果.
Underground fractures are important channels for oil and gas accumulation and migration, and fracture rock physics is the bridge between fracture parameters and seismic response.Starting from fracture rock physics, this paper explores the method to predict underground fractures using seismic data.Firstly, Equivalent model to make up for the absence of logging shear wave and to predict the physical parameters of fractured rock. Then, the approximate relationship between the physical parameters of fractured rock and the seismic response is deduced, and the seismic direct seismic data of rock crack and rock are explored Finally, the reliability of the physical equivalent model of fractured rock and the accuracy of the direct inversion method of fractured rock physical parameters were verified by using well logging data and real seismic data respectively. The results show that the fractured rock is physically equivalent The model can be used to estimate the P- and S-wave velocities and the rock physical parameters of the fractured rock, and the direct seismic inversion method of fractured rock physical parameters has a higher noise resistance. In the estimation of the actual target zone elastic parameters and fracture rock physical parameters, Better application results.