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Identifying hidden risk elements for CO2 storage from reprocessed seismic data

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Author: Carpentier, S.F.A. · Abidin, H. · Steeghs, P. · Veldkamp, J.G.
Type:article
Date:2018
Publisher: European Association of Geoscientists and Engineers, EAGE
Source:5th CO2 Geological Storage Workshop, 5th CO2 Geological Storage Workshop, 21 November 2018 through 23 November 2018
Identifier: 865914
ISBN: 9789462822702
Keywords: Carbon dioxide · Cost effectiveness · Costs · Faulting · Image denoising · Low permeability reservoirs · Petroleum reservoir engineering · Seismic prospecting · Seismology · Signal to noise ratio · Conformance control · Exploration and productions · Lateral resolution · License to operate · Non-local means filtering · Prestack time migration · Seismic exploration · Storage operations · Digital storage

Abstract

CO2 storage needs economic business cases through cost-effective exploration and production and needs license-to-operate through public support. Re-interpretation and reprocessing of vintage geophysical data is a means to achieve cost-effective exploration whereas de-risking and conformance control of storage operations is a means to obtain public support. Seismic exploration should identify risk elements for CO2 storage such as the risk of leakage, risk of pressure build-ups or drops, unexpected increase or decrease of storage capacity and spill points to name a few. These risks elements are often caused by hidden features such as a failing overburden seal, closed or open faults in either reservoir or seal and high- or low-permeability streaks in the reservoir. We have investigated a seismic reprocessing workflow for imaging and de-risking CO2 storage reservoirs and seals. The workflow includes statics, demultiple, velocity modeling, Prestack Time Migration, high resolution sparse spike deconvolution and Non Local Means filtering. Non Local Means filtering increases signal to noise ratio while preserving edges and the sparse spike deconvolution produces results with superior vertical and lateral resolution. This workflow manages at low cost to considerably de-risk the CO2 storage reservoirs and seals by identifying previously hidden faults, seal-reservoir contacts and thin reservoir streaks. © 2018 European Association of Geoscientists and Engineers, EAGE. All rights reserved.