Subsurface Imaging of 2D Seismic Data Using Kirchhoff Time Migration Method, Central Iraq

Obaid, Fadhil Abdul abass; Al-Rahim, Ali M.; Ali, Hassan Zaid

doi:10.24996/ijs.2020.61.12.19

Cited by 2 publications

(2 citation statements)

References 7 publications

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“…3-D display of subsurface structural geology data files for a small area within the study area (seven profiles), mapped into a single data file that can be read using the RES3DINV software which tends to be inverted. RES3DINV is a computer software [30] that will automatically determine a 3-D resistivity model below the surface using data obtained from a 3-D electrophoresis image [31,32]. The inversion routine used by the software is based on the smoothly constrained least-squares method [31].…”

Section: Materials and Methods Description Site And Stratigraphymentioning

confidence: 99%

Detection of Shallow Cavities Using 3D Resistivity Technique in a Small Site Near Haditha City, Western Iraq

Al-Jumaily

Abed

Ali

2022

eijs

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Iraqi western desert is characterized by a widespread karst phenomenon and caves. Euphrates formation (Lower Miocene) includes enormous sinkholes and cavities within carbonate rocks that usually cause severe damages to any kind of engineering facilities built over it. 3D resistivity imaging techniques were used in detecting this kind of cavities in complicated lithology. The 3D view was fulfilled by collating seven 2D imaging lines. The 2D imaging survey was carried out by Dipole-dipole array with (n) factor and electrode spacing (a) of 6 and 2m respectively. The horizontal slices of the 3D models give a good subsurface picture. There are many caves in all directions (x, y, z). They reveal many small caves near the surface. These caves are clearly shown as points with highly variable resistivity values in slices of depths 0.80 m, 1.72 m, 2.78 m, and 3.99 m. The comparison between standard Least-square and robust constrain methods appeared that the inverse model produced by the robust constrain method has sharper and straighter boundaries. The results of both the two-dimensional and the three-dimensional resistive imaging models deal with almost the same spread of subsurface caves in the study area and show a high amount in number, especially in the upper part, white in color oolitic limestone, the second member of Euphrates Formation, of 3.8-8m depth. 2D and 3D resistivity imaging values have Standard Roof-mean square (RMS) error for large inverted models, this confirms that the study area is of high inhomogeneity. This heterogeneity resulted in a large variation in the resistivity of the rock component in addition to the large spread of caves near the surface.

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Section: Materials and Methods Description Site And Stratigraphymentioning

confidence: 99%

Detection of Shallow Cavities Using 3D Resistivity Technique in a Small Site Near Haditha City, Western Iraq

Al-Jumaily

Abed

Ali

2022

eijs

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“…Two-dimensional electrical resistivity imaging profiles were centered over an existing buried concrete cast to verify the suitability of the dipole-dipole group to identify the buried shallow structures. For each profile [15], one hundred twenty electrodes were connected with a minimum electrode spacing of 0.5 m to the ABEM SAS 4000 resistivity system to collect the apparent resistivity data. RES2DINV uses the finite difference method based on regular least-squares optimization procedures [16].…”

Section: Field Workmentioning

confidence: 99%

Electrical Resistivity Imaging (ERI) for Identifying Near-surface Bodies at Diyala University site, NE of Iraq

Shamkhi

Karim

2022

Iraqi Journal of Science

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The current research demonstrates the ERI method's effectiveness as a supplementary engineering site investigation approach. Engineering site research is important to indicate the subsoil of proposed production sites. The benefit of the dipole-dipole array for ERI electrical resistivity imaging is that it provides informative records of subsurface geology and condition along with profiles. The dipole-dipole array was performed along with three parallel profiles at the Diyala University site to identify the buried facilities (pipes and cables) in the area. The buried electric cable embedded in a plastic tube was used for simulation to report and verify the field resistivity results. Interpretation of field facts confirmed that the used ERI method was robust in locating buried structures. The dipole-dipole array's strong horizontal sensitivity to subsurface resistivity releases made it possible to provide greater certainty of site characteristics concerning the buried systems. The results were consistent with the information on wells near the work site.

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Subsurface Imaging of 2D Seismic Data Using Kirchhoff Time Migration Method, Central Iraq

Cited by 2 publications

References 7 publications

Detection of Shallow Cavities Using 3D Resistivity Technique in a Small Site Near Haditha City, Western Iraq

Detection of Shallow Cavities Using 3D Resistivity Technique in a Small Site Near Haditha City, Western Iraq

Electrical Resistivity Imaging (ERI) for Identifying Near-surface Bodies at Diyala University site, NE of Iraq

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