Document Type : Original Research Paper
Authors
1 Exploration Directorate, National Iranian Oil Company, Tehran, Iran
2 Institute of Geophysics, University of Tehran, Tehran, Iran
3 Geological Survey of Iran, Tehran, Iran
Abstract
One of the duties of seismic interpreter is interpretation of the geological structures likely to be found at deeper levels. Such constructions form a key to the understanding of regional tectonics and they often play a vital role in industry. The exploration for oil and gas in particular requires the best possible control on underground structures in order to locate drill holes for exploration investigation or for producing wells. Because the primary data are always incomplete and may be in part contradictory, the final interpretation should be at least geometrically validated. A powerful and independent test for the validity of a structural interpretation is the restoration of the structure to the shape it had before deformation. Restoration is a fundamental test of the consistency of the interpretation. It is best described by transformation equations which incorporate rigid translation and rotation plus deformation. A map or cross section can usually be restored by methods based on more than one kinematic model, and different methods will produce somewhat different restored geometries. It follows that any given restoration doesn’t necessarily represent the exact pre-deformation geometry. The internal consistency of the restoration by any technique constitutes a validation of the interpretation. In this study, the main aim is introducing the balancing of seismic interpretation and its application to decrease the errors of interpretation. For this purpose, length and area balancing were done at a sample seismic cross section from 3D seismic data of two oilfields at the East of Khuzestan (SW Iran). As a result, the primary interpretation was corrected and finally the corrected interpretation was compared with primary interpretation. For balancing of seismic sections in this area, the flexural slip technique is selected as optimum technique through testing line-length, vertical simple shear and flexural slip techniques.
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