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The Impact of the Low-frequency Component of Seismic Data on Geological Results of the Deterministic Acoustic Inversion
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Saint Petersburg 2018, Apr 2018, Volume 2018, p.1 - 6
Abstract
Summary
The paper presents an example of estimating the contribution (“value”) of low- frequency energy of seismic data by assessing the accuracy of the reservoir properties quantitative forecast based on the results of inversion transformations. The basis was 3D seismic data, recorded by geophones-accelerometers at one of the fields in Eastern Siberia, and specially processed with conservation of low-frequency components. The consistent exception of borehole curves when building acoustic impedance low-frequency models allowed for a “blind prediction” based only on the difference in the initial seismic data. It is established that the porosity forecast for seismic data with a low frequency energy of 6–12 Hz is more accurate than seismic data without low-frequency energy up to 8.7%. The greatest difference is typical for areas of increased thickness of the Vendian deposits. Porosity cut-off in the Vendian deposits is 6%. The accuracy of the porosity prediction from seismic data is significantly dependent on the presence or absence of low-frequency energy, which as a result can lead to the appearance of non-existent reservoirs on forecast maps.
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