RefDoc
Haut

Faire une nouvelle recherche
Make a new search
Lancer la recherche


Titre du document / Document title

Extended elastic impedance for fluid and lithology prediction

Auteur(s) / Author(s)

WHITCOMBE David N. (1) ; CONNOLLY Patrick A. (2) ; REAGAN Roger L. (3) ; REDSHAW Terry C. (4) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) BP, GFU Business Unit, Burnside Road, Farburn Industrial Estate, Dyce, Aberdeen AB21 7PB, ROYAUME-UNI
(2) BP, Angola Business Unit, Compass Point, 79-87 Kingston Road, Knowle Green, Staines, Middlesex TW18 1DY, ROYAUME-UNI
(3) BP, 501 Westlake Park Boulevard, Houston, Texas, 77079-2696, ROYAUME-UNI
(4) BP Research Centre, Chertsey Road, Sunbury Upon Thames, Middlesex TW16 7LN, ROYAUME-UNI

Résumé / Abstract

Constant angle projections of seismic sections can be designed to provide maximum discrimination between fluids or lithologies. The optimum projection for a noise-free, isotropic environment can be obtained using an extension to the elastic impedance concept, which itself is an extension of acoustic impedance (AI) to nonzero angles of incidence. To achieve this, we modify the definition of elastic impedance (EI) beyond the range of physically meaningful angles by substituting tan X for sin2θ in the two-term reflectivity equation. The primary variable now becomes X rather than 0. We allow it to vary between -90° and +90°, which gives an extension of EI for any combination of intercept and gradient. We refer to this form of elastic impedance as extended elastic impedance (EEI). In this paper we demonstrate that EEI can be tuned using different X values to be approximately proportional to a number of elastic parameters, and we give EEI expressions for shear impedance (SI), bulk modulus, shear modulus, Lamé's parameter, and Vp/Vs. This leads to the identification of different areas of EEI space that tend to be optimum for fluid and lithology imaging. Having identified an appropriate X value, the equivalent seismic section can be obtained from combinations of intercept and gradient stacks from routine AVO processing.

Revue / Journal Title

Geophysics    ISSN  0016-8033   CODEN GPYSA7 

Source / Source

2002, vol. 67, no1, pp. 63-67 (9 ref.)

Langue / Language

Anglais

Editeur / Publisher

Society of Exploration Geophysicists, Tulsa, OK, ETATS-UNIS  (1936) (Revue)

Mots-clés anglais / English Keywords

seismic surveys

;

data processing

;

shear modulus

;

bulk modulus

;

geologic sections

;

lithofacies

;

prediction

;

acoustical impedance

;

hydrocarbons

;

reservoir rocks

;

elasticity

;

impedance

;

reservoirs

;

Mots-clés français / French Keywords

Impédance élastique

;

Levé sismique

;

Traitement donnée

;

Module cisaillement

;

Module élasticité

;

Coupe géologique

;

Lithofaciès

;

Prévision

;

Impédance acoustique

;

Hydrocarbure

;

Roche magasin

;

Elasticité

;

Impédance

;

Réservoir

;

Mots-clés espagnols / Spanish Keywords

Levantamiento sísmico

;

Tratamiento datos

;

Módulo cizalladura Coulomb

;

Módulo elasticidad

;

Corte geológico

;

Litofácies

;

Previsión

;

Hidrocarburo

;

Roca reservorio

;

Elasticidad

;

Localisation / Location

INIST-CNRS, Cote INIST : 3126, 35400010024017.0060

Nº notice refdoc (ud4) : 13487932



Faire une nouvelle recherche
Make a new search
Lancer la recherche
Bas