DOI: 10.1016/j.tecto.2020.228563
论文题名: Morphology of the basement and Hormuz salt distribution in offshore Abu Dhabi from constrained 3-D inversion of gravity and magnetic data
作者: Geng M. ; Ali M.Y. ; Fairhead J.D. ; Bouzidi Y. ; Barkat B.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 791 语种: 英语
中文关键词: 3-D inversion
; Basement structure
; Gravity
; Hormuz salt
; Magnetic
; United Arab Emirates
英文关键词: Buildings
; Magnetism
; Morphology
; Offshore oil well production
; Oil fields
; Precipitation (meteorology)
; Salts
; Seismology
; Abu Dhabi , United Arab Emirates
; Aeromagnetic data
; Constrained inversions
; Exploration wells
; Gravity inversions
; Inversion results
; Magnetic basement
; Structural lineaments
; Gravitation
; basement rock
; data inversion
; diapir
; gravity field
; magnetic field
; offshore application
; salt tectonics
; uplift
; Abu Dhabi [United Arab Emirates]
; United Arab Emirates
英文摘要: Many seismic surveys and exploration wells have been conducted in offshore Abu Dhabi, United Arab Emirates. However, the Neoproterozoic basement and the Infracambrian Hormuz salts were not imaged or penetrated by seismic and well data. To delineate the morphology of the basement and distribution of salt bodies, we applied a 3-D constrained inversion method to aerogravity and aeromagnetic data covering offshore Abu Dhabi. Well and seismic data were used to constrain and validate the inversion results. The magnetic inversion model resulted in a robust basement model that varies in depth from 8 to 10 km with two highs at 8 and 8.5 km highlighting possibly magmatic bodies. In contrast, the gravity inversion model does not delineate very well the basement morphology, possibly due to the lower density salt bodies masking the gravity response of the higher density basement. By calculating and removing the gravity response of the magnetic basement model from the observed gravity data, we recovered the residual gravity response of the Hormuz salts. The 3-D gravity inversion of the residual shows that the Hormuz salts are more wide-spread and thicker than previously thought with a depth to top of salt varying from 5.5 to 8.5 km. This salt model suggests that the giant oilfields in offshore Abu Dhabi, such as Umm Shaif, Nasr, Abu Al-Bukhoosh, Zakum, Sarb and Hail, occur exactly above crests of salt pillows. In addition, a series of smaller oilfields are found located at the margin of the northern basement high, and three structural lineament trends (NE-SW, NW-SE, and N-S) were identified from the inverted basement and salt models. Reactivation of these fault trends and associated diapiric salt uplifts, as observed in the seismic sections and curvature map, played a major role in shaping the basement morphology and mobilization of the Hormuz salts. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170590
Appears in Collections: 气候变化与战略
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作者单位: Khalifa University of Science and Technology, Abu Dhabi, United Arab Emirates; School of Earth and Environment, University of LeedsLS2 9JT, United Kingdom
Recommended Citation:
Geng M.,Ali M.Y.,Fairhead J.D.,et al. Morphology of the basement and Hormuz salt distribution in offshore Abu Dhabi from constrained 3-D inversion of gravity and magnetic data[J]. Tectonophysics,2020-01-01,791