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 h English (en)Attributes can be measured along a single trace or throughout a volume or in other ways. The first attributes identified as such were the 1D complex-trace attributes of envelope amplitude, instantaneous phase, instantaneous frequency, and apparent polarity (see [[Special:MyLanguage/Dictionary:complex-trace_analysis|''complex-trace analysis'']]) and acoustic impedance (or velocity) determined by [[Special:MyLanguage/Dictionary:inversion|''inversion'']] (q.v.). Attributes may be measured along a defined (picked) surface (horizon attributes) such as ''amplitude extraction, dip magnitude, dip azimuth, artificial illumination'', and [[Special:MyLanguage/Dictionary:coherence|''coherence'']] (q.v.). ''Hydrocarbon indicators'' (q.v.) are attributes. Attributes can be combined to make new attributes. Transformations of attributes are sometimes given physical-property names (porosity, fluid saturation, lithology, stratigraphic or structural discontinuity, etc.), usually based on local crossplots or local correlations with borehole-log or other measurements; they may be reasonable approximations locally but they are apt to give erroneous values under different circumstances. See Figures [[Special:MyLanguage/Dictionary:Fig_A-23|A-23]] and [[Special:MyLanguage/Dictionary:Fig_A-24|A-24]], Brown (1999, chap. 8)<ref name="Brown 1999">{{cite book | last=Brown | first=Alistair | title=Interpretation of three-dimensional seismic data | publisher=Published jointly by American Association of Petroleum Geologists and the Society of Exploration Geophysicists | location=Tulsa, Okla | year=1999 | isbn= | page=234}}</ref>.]], and Chen and Sidney (1997)<ref name="ChenSidney1997">{{cite journal|last1=Chen|first1=Quincy|last2=Sidney|first2=Steve|title=Seismic attribute technology for reservoir forecasting and monitoring|journal=The Leading Edge|volume=16|issue=5|year=1997|pages=445–448|doi=10.1190/1.1437657}}</ref>.
 h Spanish (es)Los atributos se pueden medir en una sola traza o a través de un volumen o de otras maneras. Los primeros atributos identificados como tal fueron los atributos de envolvente de amplitud de traza compleja 1D, fase instantánea, frecuencia instantánea, polaridad aparente (ver [[Special:MyLanguage/Dictionary:complex-trace_analysis/es|análisis de trazas complejas]]) e impedancia acústica (o velocidad) determinada por [[Special:MyLanguage/Dictionary:inversion/es|inversión]]. Los atributos pueden ser medidos a lo largo de una horizonte (definido) (atributos de horizonte) tales como ''extracción de amplitudes, magnitud de buzamiento, azimut de buzamiento, iluminación artificial'' y [[Special:MyLanguage/Dictionary:coherence/es|coherencia]]. Los ''indicadores de hidrocarburos'' son atributos. Los atributos se pueden combinar para crear nuevos atributos. A las transformaciones de atributos algunas veces se les da el nombre de propiedades físicas (porosidad, saturación de fluidos, litología, discontinuidad estratigráfica o estructural, etc.), usualmente con base en diagramas cruzados locales o correlaciones locales con registros de pozos u otras mediciones; pueden haber aproximaciones locales razonables pero se prestan para arrojar valores erróneos bajo circunstancias especiales. Ver Figuras [[Special:MyLanguage/Dictionary:Fig_A-23/es|A-23]] y [[Special:MyLanguage/Dictionary:Fig_A-24/es|A-24]], Brown (1999, cap. 8)<ref name="Brown 1999">{{cite book | last=Brown | first=Alistair | title=Interpretation of three-dimensional seismic data | publisher=Published jointly by American Association of Petroleum Geologists and the Society of Exploration Geophysicists | location=Tulsa, Okla | year=1999 | isbn= | page=234}}</ref>.]], and Chen and Sidney (1997)<ref name="ChenSidney1997">{{cite journal|last1=Chen|first1=Quincy|last2=Sidney|first2=Steve|title=Seismic attribute technology for reservoir forecasting and monitoring|journal=The Leading Edge|volume=16|issue=5|year=1997|pages=445–448|doi=10.1190/1.1437657}}</ref>.