HIGH‐RESOLUTION PREDICTION OF ACOUSTIC IMPEDANCES BELOW BOTTOM‐OF‐HOLE*
B. B. TAL‐VIRSKYState University, Faculty of Geology, Geophysics Department, 700 095 Tashkent, Vuzgorodok, USSRА.А. TabakovState University, Faculty of Geology, Geophysics Department, 700 095 Tashkent, Vuzgorodok, USSR
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Аннотация
A bstract Prediction of acoustic impedances below bottom‐of‐hole developed in the paper is based on VSP data processing. The pulse form and reflections are deduced from records on the vertical array by the method of subtraction. A deterministic prediction error and a wave‐shaping Wiener filter are used to transform the pulse train and reflections into a short symmetrical pulse. Additional broadening of the pulse spectrum is achieved by stacking of seismograms from shots with various dominant frequencies after zero‐phase transformation of downgoing waves. The inversion of seismograms is made after ideal spiking by means of a subtraction procedure. Acoustic impedances deduced are closely related to lithology of rocks below bottom‐of‐hole.
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