2024-03-28T14:05:45Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1626642021-04-27T15:45:02Zcom_10261_82com_10261_8col_10261_335
Fracture characterization in sigmoidal folds: Insights from the Siah Kuh anticline, Zagros, Iran
Casini, Giulio
Romaire, I.
Casciello, Emilio
Saura, Eduard
Fernández, Naiara
Vergés, Jaume
Hunt, David W.
Iran
Zagros
Fracture
Remote sensing
Anticline
fold and thrust belt
fracture
hydrocarbon
normal fault
passive margin
Pliocene
porosity
shape
uncertainty analysis
Fieldwork and remote-sensing data from the Siah Kuh anticline, simply folded belt, Zagros, Iran indicate that specific structures and fracture systems formed during the development of its sigmoidal shape, and that conceptual fracture models developed for cylindrical folds are inadequate for the correct evaluation and development of hydrocarbon accumulations in this type of anticline. The sigmoidal shape of the Siah Kuh anticline was achieved in the Pliocene due to vertical axis rotations of an already existing anticline. These rotations promoted the development of (1) two systems of normal faults in the outer arcs of the sigmoidal shape, (2) a low-angle thrust, and (3) the north-south Danan anticline in the inner arc of its easternmost bend. The passive margin to syn-folding structures, typically observed in nearby cylindrical and periclinal anticlines, predated the development of the sigmoidal shape and were passively rotated into the segments of the anticline. The sigmoid-related structures are spatially, geometrically, and kinematically related to the bends of the anticline trend, hence they can be predicted and modeled in the subsurface. The sigmoid-related normal faults have a great potential to preserve porosity and promote localized high flow rates or early water breakthrough. However, if they cut through thin reservoir and seal units, sigmoid-related thrusts and normal faults might compromise lateral reservoir continuity and seal integrity. The results of this study can help in reducing risks and uncertainty in the evaluation and development of business opportunities in secondary sigmoidal anticlines within the Zagros or any other fold-thrust belt. Copyright © 2018. The American Association of Petroleum Geologists. All rights reserved.
Peer reviewed
2018-03-22T08:16:12Z
2018-03-22T08:16:12Z
2018-03
artículo
http://purl.org/coar/resource_type/c_6501
AAPG Bulletin, 102(3): 369-399 (2018)
0149-1423
http://hdl.handle.net/10261/162664
10.1306/0503171615817076
en
Postprint
http://dx.doi.org/10.1306/0503171615817076
Sí
none
American Association of Petroleum Geologists