利用多极子阵列声波测井资料计算横向各向同性地层破裂压力

Determining breakdown pressures in transversely isotropic formation by multipole array acoustic logs

准确计算各向异性地层中岩石破裂压力在石油勘探开发中有着十分重要的作用。针对常见的横向各向同性介质地层,推导了三轴地应力计算公式,提出了利用多极子阵列声波测井资料来求解其相关参数,从而计算岩石破裂压力的方法。同时开发了相应的计算软件,给出了在某油田碳酸盐岩储层的应用实例。实际资料处理表明,利用该计算公式处理的结果与各向同性模型相比,更符合破裂压力实际监测结果。

Determining breakdown pressure in an anisotropic formation is important in oil and gas exploration and production, The equations of three principal in-situ stresses in a transversely isotropic formation were formulated. The elastic parameters and breakdown pressure were determined in such a formation by muhipole array acoustic logs, Subsequently the method was developed, Implementations of this method as multipole acoustic analysis software on the field carbonate formation data from the oilfield were presented and compared with that from isotropic formation model, The data demonstrate that the new model is more realistic and closer to the field monitoring results.