Moment tensor inversion of perforation shots using distributed acoustic sensing

Perforation shots in unconventional wells excite seismic waves that travel through the reservoir layer and get recorded by distributed acoustic sensing (DAS) fiber. These waves can be used to characterize either the elastic properties of the reservoir or the perforation itself. In both cases, the seismic source representing the perforation shot must be known. To the authors’ knowledge, there is no available representation of such a source. We propose a three-mechanisms source model with three structured moment tensors whose magnitudes are to be determined. Following a three-step procedure, we invert the resolvable moment tensor components of 100 perforation shots using DAS data. The result can be used to interpret the quality of the perforation and to conduct subsequent elastic waveform inversions