Interpretive advantages of 90°-phase wavelets: Part 1 — Modeling

• DOI: 10.1190/1.1925740
• Publication Date: 2005-06-16T15:22:02Z
• Authors: Hongliu Zeng; Milo M. Backus
• Keywords: Interpretability; Wireline; Lithology; Synthetic seismogram; Amplitude distortion

We discuss, in a two-part article, the benefits of 90°-phase wavelets stratigraphic and lithologic interpretation seismically thin beds. In Part 1, seismic models Ricker with selected phases are constructed to assess interpretability composite waveforms increasingly complex geologic settings. Although superior for single surface thick-layer interpretation, zero-phase data not optimal interpreting beds thinner than wavelength because their antisymmetric thin-bed responses tie reflectivity series rather impedance logs. Nonsymmetrical (e.g., minimum-phase wavelets) generally recommended asymmetric have large side lobes. Integrated traces also less desirable they lose high-frequency components integration process. However, application consistently improves interpretability. The unique symmetry response eliminates dual polarity responses, resulting better imagery geometry, profiles, lithology, stratigraphy. Less amplitude distortion stratigraphy-independent, interference lead more accurate acoustic estimation from lithology-indicative wireline Field applications presented part 2 this article.