Selection of optimal parameters for the thin layers thickness calculation using waveform classification
DOI:
https://doi.org/10.17308/geology/1609-0691/2024/3/114–120Keywords:
seismic exploration, interpretation of seismic data, thin layer, waveform classificationAbstract
Introduction: determining effective thickness is important for estimation of oil and gas reserves. To calculate the thickness of layers in the interwell space, 3D seismic data are used, but the resolution is limited by the wavelength and does not exceed 12–20 m.
Methodology: this paper discusses the criteria for selecting parameters for calculating the thickness of a thin reservoir using waveform classification. Parameters such as the length of the time interval, the position of the interval relative to the top of the analyzed interval, and the number of classes were analyzed. Results quality assessment was carried out by calculating the root-mean-square error between the calculated thickness and thickness in the wells.
Results and discussion: as a result of the calculations, the optimal parameters were selected for calculating the thickness of a thin layer using the waveform classification: the length of the interval is equal to the wave period of the analyzed signal (20 ms), the location of the interval is symmetrical relative to the reflection from the top of the interval, the depth class step is 2 m (25 classes per 50 m interval ).
Conclusions: the use of seismic waveform classification can be used to calculate the thickness of thin formations beyond the resolution of seismic surveys.
