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Noninvasive Determination of the Location and Distribution of DNAPL Using Advanced Seismic Relfection Techniques
Author(s) -
Temples Tom J.,
Waddell Michael G.,
Domoracki William J.,
Eyer Jerome
Publication year - 2001
Publication title -
groundwater
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 94
eISSN - 1745-6584
pISSN - 0017-467X
DOI - 10.1111/j.1745-6584.2001.tb02331.x
Subject(s) - amplitude , geology , seismology , reflection (computer programming) , reflection coefficient , plio pleistocene , pleistocene , amplitude versus offset , mineralogy , paleontology , optics , physics , computer science , programming language
Recent advances in seismic reflection amplitude analysis (e.g., amplitude versus offset‐AVO, bright spot mapping) technology to directly detect the presence of subsurface DNAPL (e.g., CCl 4 ) were applied to 216–Z‐9 crib, 200 West Area, DOE Hanford Site, Washington. Modeling to determine what type of anomaly might be present was performed. Model results were incorporated in the interpretation of the seismic data to determine the location of any seismic amplitude anomalies associated with the presence of high concentrations of CCl 4 . Seismic reflection profiles were collected and analyzed for the presence of DNAPL. Structure contour maps of the contact between the Hanford fine unit and the Plio/Pleistocene unit and between the Plio/Pleistocene unit and the caliche layer were interpreted to determine potential DNAPL flow direction. Models indicate that the contact between the Plio/Pleistocene unit and the caliche should have a positive reflection coefficient. When high concentrations of CCl 4 are present, the reflection coefficient of this interface displays a noticeable positive increase in the seismic amplitude (i.e., bright spot). Amplitude data contoured on the Plio/Pleistocene‐caliche boundary display high values indicating the presence of DNAPL to the north and east of the crib area. The seismic data agree well with the well control in areas of high concentrations of CCl 4 .