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Origin of reflectors in seismic line 2, Toa Baja, Small gas horizons associated with enhanced reflector amplitudes, and recognizing leaky and sealing faults using gas chromatography data
Author(s) -
Larue D. K.,
Anderson R. N.,
Goldberg D.,
Moos D.
Publication year - 1991
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/91gl00395
Subject(s) - reflector (photography) , geology , amplitude , reflection (computer programming) , petrology , methane , seismology , mineralogy , optics , ecology , light source , physics , computer science , biology , programming language
Reflectors imaged in a multichannel seismic line at Toa Baja, Puerto Rico, were studied by comparing the positions of reflection events with changes in rock properties determined through analysis of logs and cuttings. Reflectors appear to be associated primarily with changes in rock properties across facies or formation boundaries, and more rarely unconformities and faults. Faults that seal versus faults that leak can be recognized on the basis of gas Chromatograph data. Several laterally discontinuous reflectors characterized by modest amplitude anomalies seem to correlate in depth with minor shows of methane gas, measured by onsite gas chromatography. Gas was not recognizeable using geophysical logs indicating small quantities. The gas is apparently associated with rock types and rock properties which affect reflector amplitude rather than directly enhancing reflector amplitude.