地震暗點

地震暗點（dim spot）是指地震波屬性在局部顯示的低振幅異常，一般可指碳氫化合物的存在^[1]。起因是含碳氫化合物的砂岩其聲阻抗比同層含水的聲阻抗低的。如果在深層，上層被低聲阻抗頁岩覆蓋，砂岩頂界反射係數在含碳氫化合物地區會減低。因而造成局部暗點^[2] 。在淺部地層，頁岩和砂岩聲阻抗會交叉相反，反而造成亮點（bright spot）^[3].

參考文獻

^ Sheriff, R. E.; Geldart, L. P. (1995). Exploration Seismology (2nd ed.). Cambridge University Press. p. 415. ISBN 0521468264
^ Hilterman, Fred J., (2001), 「Seismic Amplitude Interpretation」, SEG.
^ Brown, Alistar. R., (2010), 「Dim Spots in Seismic Images as Hydrocarbon Indicators」, AAPG Search and Discovery Article #40514

[”Sheriff”-1] Sheriff, R. E.; Geldart, L. P. (1995). Exploration Seismology (2nd ed.). Cambridge University Press. p. 415. ISBN 0521468264

[Hilterman”-2] Hilterman, Fred J., (2001), 「Seismic Amplitude Interpretation」, SEG.

[”Brown”-3] Brown, Alistar. R., (2010), 「Dim Spots in Seismic Images as Hydrocarbon Indicators」, AAPG Search and Discovery Article #40514

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