Seismic blending and deblending of crossline sources

Seismic blending and deblending of crossline sources

Reinicke Urruticoechea, C.

Drijkoningen, G.G. (mentor)
Van Groenestijn, G.J.A. (mentor)

Civil Engineering and Geosciences

Geoscience & Engineering

Applied Geophysics and Petrophysics

2015-08-28

Blending is a recent seismic acquisition design, which allows seismic shots to interfere. Current processing techniques are not capable to deal with blended data. Consequently, the blended data must be deblended (separated) as if they were acquired in a conventional way. I propose a new acquisition design based on blended crossline sources. In contrast to existing blended- acquisition designs that only blend in 2D (inline direction and time), this design blends sources in 3D (inline direction, crossline direction and time). Blended crossline sources allow to increase the data quality and/or to reduce the acquisition costs. While most blended- acquisition designs blend two sources, the proposed acquisition design blends up to seven sources. In order to realize this increase in number of blended sources without degrading the data quality, both the blended-acquisition design and the deblending method must be improved. To enhance the blending, I introduce a new incoherency measure of the blended-acquisition design, and propose three incoherent blending patterns. A 2D synthetic data example il- lustrates that the deblending quality indeed is optimized by maximizing the incoherency of the blended acquisition. To enhance the deblending, I derive a 3D deblending method. In contrast to 2D deblending methods, this method exploits both the crossline and inline direc- tion to deblend sources. The 3D deblending method significantly increases the deblending quality as illustrated by a 3D synthetic data example. The feasibility of blended crossline sources is proven on a 3D complex synthetic data example. Two acquisition configurations are examined: The Wide Crossline Source Array that aims to reduce the acquisition costs, and the Dense Crossline Source Array that increases the data quality. Both of them provide excellent deblending results with quality factors of 14.2 dB and 20.8 dB respectively.

blending
deblending
simultaneous sources
incoherent
incoherency

http://resolver.tudelft.nl/uuid:d73234ae-d7e0-4348-ac69-92078820438c

Student theses

master thesis

(c) 2015 Reinicke Urruticoechea, C.