Geometrical analysis of folds and quantitative strain values using balanced seismic profiles (Case study of Kupal oil field)
Subject Areas : Geoscience Fields in relation with Petroleum GeologyBabak Samani 1 , Yaghoub Jalili 2 , Negar Mollaei 3
1 -
2 - Faculty of Earth sciences, Shahid Chamran University of Ahvaz
3 - Faculty of Earth Sciences, Shahid Chamran University of Ahvaz
Keywords: Seismic profile, Balanced cross section, Fold aspect ratio, Strain ratio, Shortening percentage.,
Abstract :
In this study, using interpreted seismic profiles, the geometric nature of folding and quantitative strain values in the Asmari carbonate horizon in the Kupal oil field have been investigated. For this purpose, thirteen seismic profiles from the Kupal oil field were evaluated. By extracting the Asmari carbonate horizon from each seismic profile, initial data were prepared for geometric investigation of the fold style elements and strain analyses. Examination of fold style elements in the Asmari horizon of the Kupal oil field indicates an asymmetric fold with an interlimb angle of 110 to 147 degrees (gentle to open fold), an aspect ratio of 0.15 to 0.38 (broad to wide fold), and a bluntness ratio of 0.45 to 0.7 (sub rounded fold). In order to determine the values of shortening and relative values of strain using artificial intelligence, each of the seismic profiles was balanced and the values of the initial length of the Asmari horizon were determined. The results show different shortening values in different parts of the anticline. The shortening values were calculated in the range of 2.67 to 8.65 percent and the strain ratio values in the range of 1.05 to 1.19.
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