Abstract
Tectonic depression area within and/or beside widespread basin is regarded as an important location for sub-basin sedimentary sequence of Iraq which may represent an excellent accumulation of bounded sediments. Al-Ma'aniyah depression, southwest Iraq is one of such type of sub-basin. Free-air gravity data show a NS extend of this depression inside Saudi Arabia. This work focuses on studying and multi-2.5D model creation for the depression in the Iraqi territory part using Bouguer gravity data and mapping its basement relief. Firstly, the exact boundary of the depression was outlined utilizing the Free-Air gravity data. Then, a precise selection of regional field for the study area was determined by using the power spectrum method, which accordingly defines the residual anomalies that could represent structural enclosures. Many positive anomalies were assigned and enhanced using vertical and total horizontal derivatives, where they were interpreted as basement-related features. Subsequently, a 2.5D multi modeling and depth inversion for the Bouguer gravity data were accomplished by converting the gravity map to a stacked profiles depth map. A nineteen gravity profiles, which cover the study area, were modeled by assuming 2D intra-sedimentary bodies. These bodies were best presented by a 3D view that clarifies the nature of the subsurface modeled structures. The modeling shows an extra density at the northern part of the depression, in contrast, it suggests low density bodies at its southern part, the case that appears inconsistent with a previously performed magnetic interpretation. The inversion of gravity data shows that the basement depth at Al-Ma'aniyah depression ranges from 7.5 to10 km.
Highlights
Gravity methods play an important role in the recognition of sedimentary basins (Rao et al, 1994; Ali et al, 2014)
Quantitative analysis for the gravity data in Al-Ma′aniyah depression using nineteen 2.5D forward modeled profiles and inverse modeling reveals an uplift in basement rocks in north and subsidence to the south of the study area
A 3D viewing shows a clear image for the basement relief, uplift and subsidence locations
Summary
Gravity methods play an important role in the recognition of sedimentary basins (Rao et al, 1994; Ali et al, 2014). Depression of tectonic origin within and/or beside wide spread basin have special importance as Sub-Basin which may represent an excellent accumulation of bounded or restricted sedimentary sequence. The boundaries of this type of depression areas are often rich with pinch-out structural type where promising oil traps could be found. In Iraq, many areas lack to considerable 3D seismic surveys due to bad quality seismic data, Abdulrahim and Al-Rahim (2019) One of these locations is Al-Ma'aniyah area, where the 2D seismic sections need to an extensive work for corrections to reflect the subsurface
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