Well logs with high Gamma signals are traditionally taken to to be equated with maximum flooding surfaces and are often associated with condensed sections. The autocyclic processes related to local changes in the depositional setting and the adjacent source terrain and so are interpreted by means ofĭeep water sequence stratigraphy relies heavily on the use of gamma logs, in which the high values in Gamma signal are equated with the reduced sedimentation associated with high positions of the sea.These collective properties are the products of either and/or: This is accomplished by identifying the bounding surfaces, hierarchies and stacking patterns of these bodies, and so establishing their architectural relationships. The inset shows the proposed correlations with the seismic stratigraphy establish allostratigraphy is used to interpret and predict the extent and character of deepwater sediments, as explained above, using as examples the exposures of the Ross formation in the West of Ireland.Īn important first step in the interpretation of the sedimentary bodies associated with deepwater systems is to characterize and subdivide them using sequence and allostratigraphy. Bn, Bs, and Ba = basal surface of the Northern, Southern, and Axial Fans, respectively Tsu = top surface of the ‘‘slope unit’’. ![]() (c) Composite seismic section (upper) and line drawing (lower) from Site 1077 (ODP Leg 175 Shipboard Scientific Party, 1998b Wefer et al., 1998, 2002) at the base of the Congo continental slope to the first channel/levee complex of the Northern Fan (location on a). White areas refer to hemipelagic deposits. (b) Conceptual schematic cross section (approximate location on a) illustrating the general architecture of the fan and the relationships between the Northern, Southern, and Axial Fans. ![]() The Axial and Southern Fans are in homogeneous gray tones, while the three main channel/levee complexes of the Northern Fan are shown individually the thick black sinuous line represents the present-day active Zaire Canyon/ Channel. ![]() Figure after Droz et al 2003 that designates the correlations between Zai¨Ango seismic data, Site 1077 of ODP Leg 175 (Shipboard Scientific Party, 1998b Wefer et al., 1998, 2002) and seismic stratigraphy proposed by Uenzelmann-Neben et al.
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