An AVO inversion method in the frequency domain based on a layered model—a Bakken Shale case study

摘要: Conventional AVO techniques are based on the linear approximation of Zoeppritz equations for inversion elastic properties across a subsurface interface. However, layered model consisting internal multiple layers beyond seismic resolution, it can be difficult to use traditional methods due practicalities picking amplitudes, resolution problems, and thin-layer effects. We propose an improved method applied layer thickness by incorporating frequency content wavelet. The proposed uses propagator matrix as theoretical description frequency-dependent reflection coefficients in scheme. test single with synthetic data produce porosity, then investigate feasibility characterization fracture zone Bakken formation. For reference crack density formation, minima objective functions generate results that indicate reasonable fit true parameters. error may result from intrinsic complexity reflections model, which several different combinations thicknesses associated similar coefficients. By contrast, multicomponent example, converted PS-wave seems less stable compared PP-wave data. potential include applications complex models, such sandstone/shale interbedded system, or formation presents heterogeneity.