Wide azimuth seismic processing for UAE carbonate reservoir characterization

Yoann Guilloux, Issam Tarrass, Jean Luc Boelle, Evgeny Landa, Vadim Buzlukov, Abderrahim Lafram, Michel Radigon, Mohamed Mahgoub

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

We present in this work an exhaustive seismic study which was performed on a subset of a wide azimuth Ocean Bottom Cable seismic acquisition shot over a carbonate field from the U.A.E. A first challenge was to reprocess these data ensuring that the azimuthal information is properly preserved all along the sequence. An additional challenge is related to the very shallow water environment which brings complexity like dispersive ground-roll and water layer related guided waves, multiples which can be generated at sea-surface, sea-floor or internally, near-surface heterogeneities. On top of that the high velocities which are encountered in these carbonate formations are detrimental to a high resolution description of reservoirs. Two main issues are presented: • Wide azimuth processing: the whole sequence was designed in order to preserve the azimuthal information. Multiples were attenuated in a cascaded approach including 3D predictive deconvolution and wide azimuth high resolution radon filtering. The Common Offset Vector strategy was followed at the imaging step to build 3D Common Image Gathers versus offset and azimuth, which enables to apply an azimuthally variant residual velocity correction and then stack all azimuthal contributions in an optimal manner. This azimuth friendly processing delivers gathers which are ready for azimuthal amplitude analysis. • Heterogeneities and fracture characterization: we tested a newly developed technique for imaging diffractions and compared it to the azimuthal amplitude analysis performed on Common Imaged Gathers. This pilot processing study enabled to set up an operational wide azimuth processing sequence on this dataset, several processing scenarii could be tested and compared. In particular the sequence for attenuation of multiples was considered efficient, bringing a lot of character to the final result. The implementation of multi-azimuth Diffraction Imaging over this carbonate reservoir is proving very encouraging. Numerous detected features display geologically meaningful characteristics, some of them being not visible on conventional structural attributes. This study would be among the first applications of the methodology with tangible results providing more static and dynamic fracture data become available for calibration.

Original languageEnglish
Title of host publicationSociety of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2012, ADIPEC 2012 - Sustainable Energy Growth
Subtitle of host publicationPeople, Responsibility, and Innovation
Pages3476-3484
Number of pages9
StatePublished - 2012
Externally publishedYes
EventAbu Dhabi International Petroleum Exhibition and Conference 2012 - Sustainable Energy Growth: People, Responsibility, and Innovation, ADIPEC 2012 - Abu Dhabi, United Arab Emirates
Duration: 11 Nov 201214 Nov 2012

Publication series

NameSociety of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference 2012, ADIPEC 2012 - Sustainable Energy Growth: People, Responsibility, and Innovation
Volume5

Conference

ConferenceAbu Dhabi International Petroleum Exhibition and Conference 2012 - Sustainable Energy Growth: People, Responsibility, and Innovation, ADIPEC 2012
Country/TerritoryUnited Arab Emirates
CityAbu Dhabi
Period11/11/1214/11/12

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