Open AccessRock Physics of Geologic Carbon Sequestration/Storage
Author(s) -
Jack Dvorkin,
Gary Mavko
Publication year - 2013
Language(s) - English
Resource type - Reports
DOI - 10.2172/1097614
Subject(s) - saturation (graph theory) , carbon sequestration , attenuation , geomechanics , petroleum engineering , soil science , geology , geotechnical engineering , mineralogy , chemistry , physics , mathematics , optics , carbon dioxide , organic chemistry , combinatorics
This report covers the results of developing the rock physics theory of the effects of CO{sub 2} injection and storage in a host reservoir on the rocks elastic properties and the resulting seismic signatures (reflections) observed during sequestration and storage. Specific topics addressed are: (a) how the elastic properties and attenuation vary versus CO{sub 2} saturation in the reservoir during injection and subsequent distribution of CO{sub 2} in the reservoir; (b) what are the combined effects of saturation and pore pressure on the elastic properties; and (c) what are the combined effects of saturation and rock fabric alteration on the elastic properties. The main new results are (a) development and application of the capillary pressure equilibrium theory to forecasting the elastic properties as a function of CO{sub 2} saturation; (b) a new method of applying this theory to well data; and (c) combining this theory with other effects of CO{sub 2} injection on the rock frame, including the effects of pore pressure and rock fabric alteration. An important result is translating these elastic changes into synthetic seismic responses, specifically, the amplitude-versus-offset (AVO) response depending on saturation as well as reservoir and seal type. As planned, three graduate students participated in this work and, as a result, received scientific and technical training required should they choose to work in the area of monitoring and quantifying CO{sub 2} sequestration