Comparison between deterministic and statistical wavelet estimation methods through predictive deconvolution: Seismic to well tie example from the North Sea

Estimation of the seismic wavelet through homomorphic deconvolution and well log data: application on well‐to‐seismic tie procedure

“…Comparing those results with the ones obtained by Macedo et al . (), it is possible to notice that this methodology of estimation of the wavelet produces better results. The use of both seismic and well log data to build the linear filter properly estimates the phase of the seismic wavelet, and the homomorphic deconvolution process does not imply the conventional assumptions adopted by the classical convolutional model, such as a random process reflectivity and a minimum‐phase wavelet.…”

“…Those results might be compared with the ones obtained by Macedo et al . (), since the only factor that differentiates the well ties is the estimation of the wavelet. Figure shows the input data of the algorithm to perform the estimation of the wavelet: the real seismic trace and the reflectivity in time domain calculated from well logs.…”

“…For comparison purposes, the correlation obtained by Macedo et al . () using the classical assumptions of the convolutional model for the well A was 0.65 using the predictive deconvolution, and 0.712 using the deterministic estimation of the wavelet through the Wiener filtering technique. For well B, the correlation was 0.74 using the predictive deconvolution and 0.81 using the deterministic approach.…”

The impact of density log correction on the well-to-seismic-tie - application on real seismic-well log data

“…The corrections are based on Doll's geometric factor. We use the same methodology for the well-to-seismic-tie, the same estimatives of the wavelet, and the same real data set as Macedo et al (2017). For both deterministic wavelet estimation and statistical wavelet estimation, our results on the real dataset from the Viking Graben field -North Sea show a meaningful improvement on the correlation of the wellto-seismic tie when comparing to the case where no corrections on the density log are made.…”

“…An expanded borehole or an irregular borehole wall may affect the density log curve so markedly that the curve drops precipitously, and the measured density value is much lower than the true density value Yong and Zhang (2007). Macedo et al (2017) analyzed the influence of the stability of the diameter of the borehole during acquisition on the well-to-seismic-tie and show that anomalies on the caliper logs can directly affect the quality of the tie and consequently, the estimated wavelet. Within this scenario, this work aims to show the well-to-seismic-tie response when the proper corrections on the density log for the borehole enlargment are made.…”