DOI: 10.1007/s00531-012-0858-0
论文题名: Control of Cambrian evaporites on fracturing in fault-related anticlines in the Zagros fold-and-thrust belt
作者: Carminati E. ; Aldega L. ; Bigi S. ; Corrado S. ; D'Ambrogi C. ; Mohammadi P. ; Shaban A. ; Sherkati S.
刊名: International Journal of Earth Sciences
出版年: 2013
卷: 102, 期: 5 起始页码: 1237
结束页码: 1255
语种: 英语
英文关键词: Anticline
; Evaporites
; Fractures
; Zagros
Scopus关键词: anticline
; Cambrian
; evaporite
; fold and thrust belt
; fracture
; geothermal gradient
; high temperature
; Miocene
; numerical model
; Oligocene
; saturation
; thermal maturity
; Zagros
英文摘要: Orientation and distribution of fractures in the Oligocene-Early Miocene Asmari Formation (a major reservoir rock of the Zagros petroleum system) were investigated in two anticlines of the Zagros fold-and-thrust belt. The Sim and Kuh-e-Asmari anticlines developed in the areas of the Zagros characterized by the occurrence and absence of Cambrian evaporites at the bottom of the stratigraphic pile, respectively. The aim was to outline major differences in terms of fracture spacing and saturation. Organic matter maturity and clay minerals-based geothermometers suggest that the depth of deformation for the top of the Asmari Formation in the Kuh-e-Asmari anticline was in the range of 1.5-2.7 km assuming a geothermal gradient of 22.5 °C/km. The Asmari Formation in the Sim anticline probably experienced a slightly deeper sedimentary burial (maximum 3 km) with a geothermal gradient of 20 °C/km. The spacing of fractures is generally 2-3 times larger (i.e., strain accommodated by fracturing is smaller) in the Sim anticline than in the Kuh-e-Asmari anticline. This is consistent with regional geological studies, analogue, and numerical models that suggest that thrust faults geometry and related folds are markedly different in the absence or presence of a weak decòllement (evaporites). The larger spacing in the Sim anticline is also consistent with higher temperature predicted for the Asmari Formation in this area. By contrast, the orientation of fractures with respect to the fold axes is the same in both anticlines. The fracture systems are rather immature in both anticlines. The amount and density of fractures in the twofolds are controlled by regional (occurrence/absence of salt and probably different burial), rather than local features (fold geometry). © 2013 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84878915228&doi=10.1007%2fs00531-012-0858-0&partnerID=40&md5=b5a1a054c8a2d6f29e78f16ef547f8e9
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70544
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Dipartimento di Scienze della Terra, Sapienza Università di Roma, P.le Aldo Moro 5, 00185 Rome, Italy; Dipartimento di Scienze Geologiche, Università degli Studi Roma Tre, Rome, Italy; Servizio Geologico d'Italia, ISPRA, Rome, Italy; National Iranian Oil Company, Tehran, Iran
Recommended Citation:
Carminati E.,Aldega L.,Bigi S.,et al. Control of Cambrian evaporites on fracturing in fault-related anticlines in the Zagros fold-and-thrust belt[J]. International Journal of Earth Sciences,2013-01-01,102(5)