Determination of the Paleostress Orientations and Magnitudes for Missan Structures, Southeastern Iraq

Hachem, Atheer E. K. Al; Obaidi, Mustafa Rasheed Salih Al –

doi:10.29196/jubpas.v26i10.1865

Cited by 3 publications

(3 citation statements)

References 9 publications

(16 reference statements)

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“…Many authors studied cohesion strength of the sedimentary rocks and they showed that the range of the cohesion strength magnitudes is between zero (0) bars (the rock is broken), with no stick between the two blocks of faults, and (100) bars [1], [2], [3], [4], [5], [14], [15], [22], [23], [24] and [25]. According to the compilations used by several authors, the internal friction angle (ϕ) for the sedimentary rocks is (45°) [1], [2], [3], [4], [5], [14] and [15]. Under the above determination, which is based on rupture friction analysis that depends on the stress ratio, the sliding friction angles and the vertical stress have directly resulted in the measurements of the magnitudes of the paleostresses.…”

Section: Resultsmentioning

confidence: 99%

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Determination of Magnitudes and Orientation of the Paleostress of Bekhme Structure in Shaqlawa area, Northerneastern Iraq

Hachem

Hassan

2021

eijs

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This study presents the determination of the paleostress magnitudes and orientation of Bekhme Structure in Shaqlawa area, northeastern Iraq. Paleostress analysis of slip-fault measurements is performed using Right dihedral, Lisle diagram, and Mohr Circles methods. Depending on Mohr Circles, Bott law, and vertical thickness, the magnitudes of the paleostress at the time of the tectonic activity were determined. Firstly, Georient Software was used to estimate the orientation of the paleostresses (σ1, σ2, and σ3). Secondly, using the rupture –friction law, taking into account the depth of the overburden and the vertical stress (σv),the magnitudes of the paleostresses were calculated (σ1=4500 bars, σ2=1900 bars and σ3=700 bars). The high magnitudes of the principal stress axes may be attributed to the active tectonic events which led to the deformation of the area during the Cretaceous and Tertiary periods. The study area shows that the poles of the measured faults lie in the reactivated area of Mohr circles. This indicates the instability of the study area. The study area is estimated to have high importance, due to the possibility of the existence of deposited hydrocarbons. Fold- Thrust belt marks the deformation fronts of the major orogeny that forms from the collision of the Arabian Plate with the Turkish and Iranian Plates.

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Section: Resultsmentioning

confidence: 99%

“…Several authors [2,3,4,5,14,15] used the fault slip data to calculate directions of the paleostress field.…”

Section: Methodology 1: Faults Orientation Determination Using Right Dihedral Methodsmentioning

confidence: 99%

Determination of Magnitudes and Orientation of the Paleostress of Bekhme Structure in Shaqlawa area, Northerneastern Iraq

Hachem

Hassan

2021

eijs

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“…The fault slip data was utilized by several authors such as Al-Obaidi [10]; Al-Diabat [19]; Al-Obaidi, and Al-Kotbah [11]; Al-Hachem, and Al-Obaidi [12] and Al-Shwaily and Al-Obaidi [20] to calculate trends of the paleostress field. The right dihedral approach was used to identify the trend of the study area's principle stresses axes (1, 2, and 3).The maximum principal stress (σ1) and the intermediate principal stress (σ2) were horizontal, while the minimum principal stress (σ3) was sub-vertical.…”

Section: Methodsmentioning

confidence: 99%

The Structural and Stress Analysis of Hemrin North Structure, North of Iraq.

Al-Baldawi

AL-Hachem

2022

Journal of Petroleum Research and Studies

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The study focused on the results of first paleostress from thrust fault slip data on Tertiary age of Hemrin North Structure, North of Iraq. The stress inversion was performed for fault slip data using an improved right dihedral model, and then followed by rotational optimization (Georient Software). The trend of the principal stress axes (σ1, σ2 and σ3) and the ratio of the principal stress differences (R) show the main paleostress field is NE-SW compression regime. As well as using Lisle graph and Mohr diagram to determine the magnitudes of palestress. The values paleostress of the study area were σ1=1430 bars, σ2=632 bars and σ3=166 bar. The large magnitudes of the primary stress axes could be attributed to active tectonic processes that caused pre-Tertiary deformation.

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Paleostress Analysis of Chia Gara Structure in Dohuk Area, Northern Iraq

Hachem

2020

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The use of Right dihedral method, Lisle graph, and Mohr diagram allows the analysis of the paleostress. Fault slip data were measured for eighteen data of two stations located within Chia Gara structure in Dohuk area in the High Folded Zone, Northern Iraq. Depending on Mohr diagram, Bott equation, and vertical thickness, the magnitudes of the paleostress at the time of the tectonic activity were determined. Firstly, Georient Software was used to estimate the orientation of the paleostresses (σ1, σ2 and σ3). Secondly, using the rupture –friction law, taking into account the depth of the overburden, the vertical stress (σv) was calculated to determine the magnitude of the paleostresses in the study area. The values in station one (hinge area, eight data) were σ1=7100, σ2=4121.5, and σ3=1143 bars, whereas the values in station two (the north limb of structure, ten data) were σ1=3740, σ2=1585, and σ3=570 bars. The high magnitudes of the principal stress axes may refer to the active tectonic events which led to the deformation of the area during the Mesozoic Era and the Tertiary period. The study area shows the existence of two types of the faults, the first type is the reactivated faults, the poles of which lie between the sliding line and Mohr envelope. The second type is the inactive faults, with poles lying on the great circle of Mohr diagram

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Determination of the Paleostress Orientations and Magnitudes for Missan Structures, Southeastern Iraq

Cited by 3 publications

References 9 publications

Determination of Magnitudes and Orientation of the Paleostress of Bekhme Structure in Shaqlawa area, Northerneastern Iraq

Determination of Magnitudes and Orientation of the Paleostress of Bekhme Structure in Shaqlawa area, Northerneastern Iraq

The Structural and Stress Analysis of Hemrin North Structure, North of Iraq.

Paleostress Analysis of Chia Gara Structure in Dohuk Area, Northern Iraq

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