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A simple algorithm to recover low frequencies for impedance inversion
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 79th EAGE Conference and Exhibition 2017, Jun 2017, Volume 2017, p.1 - 3
Abstract
Acoustic impedance is a rock property which contains important information about subsurface properties. It can be derived from acoustic and density well logs, but only at the well’s location. Mathematically it is calculated from the reflectivity of the earth which is estimated from seismic data. The estimated impedance is significantly affected by band-limited nature of seismic data. In this study, we propose a new methodology to obtain the low frequencies information from seismic data itself. The new methodology follows the similar algorithm of Band Limited Impedance Inversion (BLIMP), in which the low frequencies information are replaced with the low frequencies obtained using the new methodology and not from impedance log. Linear trend is acquired from the impedance logs. The new method is applied to a field data and the obtained results are compared with the impedance data of well log. The new methodology provides promising results and can play an important role in calculating an approximate impedance and can help to estimate an initial model for seismic inversion.