ABSTRACT

We develop an automated passive source detection procedure based on the Generalized Discrete Radon Transform (GDRT).The latter extends discrete slant-stack data transformations and the decoupled Prestack Depth Migration (PreSDM) algorithm used in scalar and vector seismic processing. It is implemented as weighted summation of deconvolved trace samples along a set of prescribed traveltime surfaces. This summation is performed with decoupled migration amplitude weights that minimize cross-talk between modes and suppress aliasing artefacts during the imaging process. Instantaneous prestack dip attributes define initial ray directions towards unknown source locations. Input data represent multicomponent micro-seismic recordings as well as the background isotropic or anisotropic velocity model. The procedure shows source points explicitly by high amplitudes within the Rayleigh''s limit of resolution. Application to imaging hydraulic fractures is considered. Results show that the method resolves point source objects better than conventional coupled Kirchhoff PreSDM.

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