Structural analysis of 3D seismic data, using the correlation attribute: a case study – Carboniferous of the Southern North Sea (UK)

Abstract

With the advent of a new seismic attribute, generically termed correlation, interpreters have a non-specialist tool which enables decisions to be made on structural and stratigraphic patterns within a 3D dataset. The process behind the attribute may appear to be black box technology, however, the resultant data are straightforward and enable the interpreters to make their own conclusions about the seismic information presented. Correlation data are simply a quantified comparison of adjacent seismic traces. The value to be unlocked from this attribute lies in rapid delineation of fault and stratigraphic patterns. This requires a revised approach to the interpretation workflow, involving analysis of the correlation attribute volume during primary stages of any 3D-interpretation project. Using a technique termed ‘ribbon interpretation’, correlation data are analysed for information relating to lineaments and data inconsistencies. The identification of features using ribbons, which are short 2 point segments, can then be stacked and filtered by the interpreter to give direct information on faulting and stratigraphic features. The filtered ribbon data are then progressed through to horizon interpretation, where they can be integrated to provide a more robust structural or stratigraphic solution. Application of the ribbon interpretation technique within the mature environment of the structurally complex, Carboniferous play (UK SNS) (Fig. 1) has allowed faster and better results across exploration, appraisal and production scenarios.