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FAULT GEOMETRY AND DEPTH OF DETACHMENT IN ANAH GRABEN – WEST IRAQ | ||
| Iraqi Bulletin of Geology and Mining | ||
| Article 1, Volume 2, Issue 1, 2006, Pages 13-29 | ||
| Author | ||
| Saffa F. A. Fouad | ||
| Abstract | ||
| Fault shape at depth and the depth to the corresponding detachment were estimated from calculating bed length and excess area balance in cross–section and graphically from associated hangingwall roll–over fold profile. Six different construction techniques were used on the same initial cross–section which is derived from converting a chosen seismic profile to a true depth section with equal vertical and horizontal scales. The graphical construction techniques include Chevron, modified Chevron, inclined shear, constant – slip, and flexural – slip models. Because these construction models vary considerably, since they assume different mechanisms by which the hangingwall deforms, the resultant fault shapes and their corresponding detachment depth differ according to the construction technique used. Therefore, the geometric construction models cannot provide a unique answer about the geometry of a listric normal fault at depth and the depth at which it flattens, particularly in areas of limited seismic and well data. They may define a range of possible solutions. However, the constructions show that the fault soles at deep level irrespective of the technique used. The results show good agreement with the available geophysical and geological information. | ||
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