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seismic attribute : ウィキペディア英語版
seismic attribute
In reflection seismology, a seismic attribute is a quantity extracted or derived from seismic data that can be analysed in order to enhance information that might be more subtle in a traditional seismic image, leading to a better geological or geophysical interpretation of the data.〔 http://www.slb.com/services/software/geo/petrel/seismic/seismic_multitrace_attributes.aspx Schlumberger Seismic Attribute Analysis〕
Examples of seismic attributes can include measured time, amplitude, frequency and attenuation, in addition to combinations of these. Most seismic attributes are post-stack, but those that use CMP gathers, such as amplitude versus offset (AVO), must be analysed pre-stack.〔Young, R. & LoPiccolo, R. 2005. AVO analysis demystified. E&P. http://www.e-seis.com/white_papers/AVO%20Analysis%20Demystified.pdf〕 They can be measured along a single seismic trace or across multiple traces within a defined window.
The first attributes developed were related to the 1D complex seismic trace and included: envelope amplitude, instantaneous phase, instantaneous frequency, and apparent polarity. Acoustic impedance obtained from seismic inversion can also be considered an attribute and was among the first developed.
Other attributes commonly used include: coherence, azimuth, dip, instantaneous amplitude, response amplitude, response phase, instantaneous bandwidth, AVO, and spectral decomposition.
A seismic attribute that can indicate the presence or absence of hydrocarbons is known as a direct hydrocarbon indicator.
==Amplitude attributes==
Amplitude attributes use the seismic signal amplitude as the basis for their computation.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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