Application of Multi-Scale Borehole Acoustics Imaging Technology to Fracturing Effects Evaluation
Multiple types of waves co-existing in borehole acoustic logging,can provide various insights about the formation,because of their complementary investigation depth and perspectives.Focusing on ever-increasing needs in post-fracturing evaluation,this paper demonstrates a series of related imaging technologies that can be applied to the commonly-available array acoustic logging waveform.Namely,Stoneley-based fracture imaging,slowness radial profiling via compressional wave and reflection migration via shear wave are integrated to evaluate induced fractures to different radial depths,which respectively corresponds to the shallow-scale(i.e.<0.3 meters),median scale(i.e.is about1.0 meters)and deep scale(i.e.>5.0 meters)in the field of borehole acoustic logging.Details on handling Stoneley properties,tomographic inversion strategies and migration schemes are discussed in the context of post-fracturing evaluation.The proposed multi-scale imaging technologies has been applied to a field case in western China for the first time.Processing and comparisons are conducted to multiple runs of this case,which are open-hole before fracturing and after two successive fracturing operations.Visual evidences are observed about how induced fractures are distributed from the near wellbore region into deep formation,which are in good agreement with practical findings.
万方数据
维普
