An investigation on the structures and the basement depth estimation in the western Anatolia, Turkey using aeromagnetic data

2021 ◽  
Author(s):  
Ezgi Erbek
Keyword(s):  
Depth Estimation ◽  
Western Anatolia ◽  
Aeromagnetic Data ◽  
Basement Depth

scholarly journals Analysis of gravity and aeromagnetic data to determine structural trend and basement depth beneath the Ajdabiya Trough in northeastern Libya

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Abdelhakim S. Eshanibli ◽  
Abel Uyimwen Osagie ◽  
Nur Azwin Ismail ◽  
Hussin B. Ghanush
Keyword(s):  
Gravity Data ◽  
Depth Estimation ◽  
Magnetic Data ◽  
Aeromagnetic Data ◽  
Pass Filter ◽  
Magnetic Basement ◽  
Basement Depth ◽  
Well Data ◽  
High Pass ◽  
Modelling Process

AbstractIn this study, we analyse both ground gravity and aeromagnetic data in order to delineate structural trends, fault systems and deduce sedimentary thicknesses within the Ajdabiya Trough in Libya’s northeast. A high-pass filter and a reduced-to-the-pole (RTP) transformation are applied to the gravity and aeromagnetic data respectively. Different filters are used to enhance the structural signatures and fault trends within the study area. The Werner deconvolution and source parameter imaging (SPI) techniques are applied to the RTP magnetic data for source depth estimation. Four well-data within the area are used as constraints in the two-dimensional forward modelling process. The results show that the Ajdabiya Trough is characterised by gravity anomaly highs and magnetic anomaly lows. The analysis of gravity data shows predominant Northeast–Southwest structural trends, whereas the analysis of magnetic data shows predominant North–South magnetic lineaments within the Ajdabiya Trough. The Euler deconvolution depth estimates of faults depths range between 1500 and 9500 m. The SPI estimates of the magnetic basement range between 2500 and 11,500 m beneath the study area (deepest beneath the Ajdabiya Trough). Constrained by the well-data, six major layers characterize the four profiles that are taken within the area. One of the profiles shows a high-density intrusion (about 4 km from the surface) within the sedimentary sequence. The intrusion may be the result of the rifting Sirt Basin which caused a weakening of the crust to allow for mantle intrusion.

Depth to magnetic basement in the Anambra Basin, Benue Trough of Nigeria from aeromagnetic data: A prelude for hydrocarbon exploration

2021 ◽  
pp. 1-57
Author(s):  
Olatunbosun O. Olagundoye ◽  
Chiedu S. Okereke ◽  
Aniekan E. Edet ◽  
Dominic Obi ◽  
Aniediobong Ukpong
Keyword(s):  
Depth Estimation ◽  
Data Transformation ◽  
Hydrocarbon Exploration ◽  
Hydrocarbon Generation ◽  
Depth Range ◽  
Aeromagnetic Data ◽  
Benue Trough ◽  
Anambra Basin ◽  
Magnetic Basement ◽  
Fault Structures

Data transformation, regional-residual separation, trend analysis, and Analytic Signal (AS) depth estimation were applied to aeromagnetic data covering the Anambra Basin, which is a major depocentre in the Benue Trough, southeast Nigeria with the primary objectives of accentuating attributes of magnetic sources and determining if sufficient sediment thickness exists for hydrocarbon generation, maturation, and expulsion. The application of data transformation techniques (such as map projection, merging, and reduction-to-pole) and regional-residual ensured the computation of a crustal magnetic field that would be suitable for magnetic analyses. Results indicate that the magnetic basement in the basin forms an undulating surface overlain by sediments with average thickness ranging between 4 km and 7.5 km, while maximum thickness reaches 8 km in some areas. This depth range suggests promising prospect for source-facies maturation and expulsion. We expect that areas in the study area with these appreciable sediment thicknesses, good preservation of graben-fill, and suitable areal closures or fault structures would be favorable for hydrocarbon prospectivity.

On: “The straight‐slope method for basement depth determination revisited,” by J. R. Skilbrei (April 1993 GEOPHYSICS, 58, p. 593–595).

Geophysics ◽  
1994 ◽  
Vol 59 (5) ◽  
pp. 851-852
Author(s):  
Nelson C. Steenland
Keyword(s):  
Sedimentary Basins ◽  
Thin Plates ◽  
Aeromagnetic Data ◽  
Ancillary Data ◽  
Slope Method ◽  
Depth Determination ◽  
Basement Depth

After interpreting aeromagnetic data on a worldwide basis for more than 20 years without recourse to any ancillary data, subsequent basement drilling showed an accuracy of ±7.5 percent for the contoured maps, not individual depth values, of the bottom of new sedimentary basins. The fields were resolved into intrabasement, suprabasement, and intrasedimentary anomalies, and depths were computed to their sources of thick prisms and thin plates with two universally applied coefficients. More than once, intrasedimentary volcanics were handled routinely. The author’s statement in paragraph three of his Introduction is not correct.

scholarly journals ANALYSIS OF HIGH RESOLUTION AEROMAGNETIC DATA OF SOME PARTS OF BENUE TROUGH, NIGERIA

2020 ◽  
Vol 4 (2) ◽  
pp. 76-85
Author(s):  
Nuraddeen Usman ◽  
Ibrahim Jibril
Keyword(s):  
Spectral Analysis ◽  
Magnetic Anomalies ◽  
Aeromagnetic Data ◽  
Benue Trough ◽  
First Order ◽  
Qualitative Interpretation ◽  
Maximum Value ◽  
Magnetic Source ◽  
Analysis Technique ◽  
Basement Depth

This work is aimed to determine the depth to basement of some magnetic sources in the study area. Four aeromagnetic sheets were acquired from the Nigerian Geological Survey Agency which includes (Bajoga, 131, Gulani, 132, Gombe, 152 and Wuyo, 153). The study area covers an estimated area of about 12100km2 between latitude 90N-110N and longitude 110E-130E. The total magnetic field of the study area have been evaluated. In order to determine the basement depth, spectral analysis technique was applied. Detailed analysis of the aeromagnetic data for the study area was performed. The procedure involved in the analysis include reduction to equator to remove the effect of inclination, contouring of the total magnetic intensity, separation of the regional and residual anomalies using polynomial fitting of first order, qualitative interpretation and quantitative interpretation. The residual field of the study area composes of low magnetic anomalies reaching a minimum value of -158.6nT as observed in the northern and southern parts and high magnetic anomalies reaching a maximum value of 178.1nT as observed in the western part of the study area. The result from the spectral analysis for each block shows that the depths to the magnetic source are 5.20Km for block 1, 5.74Km for block 2, 7.59Km for block 3 and 3.56Km for block 4. The average depth to magnetic source in the study area was found to be 5.52Km. Based on the computed average sedimentary thickness obtained in this study area, hydrocarbon accumulation in the study area is feasible.

Linear feature analysis for aeromagnetic data

Geophysics ◽  
2006 ◽  
Vol 71 (6) ◽  
pp. L61-L67 ◽  
Author(s):  
R. O. Hansen ◽  
Eduard deRidder
Keyword(s):  
New York ◽  
Principal Curvature ◽  
New York State ◽  
Synthetic Data ◽  
Depth Estimation ◽  
Structural Features ◽  
Horizontal Gradient ◽  
Aeromagnetic Data ◽  
Linear Feature ◽  
Total Gradient

This paper presents a new approach to detecting and two approaches to displaying lineaments associated with high-angle magnetic contacts, based on analysis of the curvature of the total horizontal gradient of the total magnetic field reduced to the pole. The first display is a contour or color plot of minus the principal curvature of largest absolute value. The second is a point plot of the local maxima of minus the largest principal curvature in regions where this curvature is negative. The paper also develops a depth-estimation technique for magnetic contacts based on the ratio of the curvature of the total gradient to the total gradient itself. Tests on synthetic data yield excellent results in detecting and delineating magnetic contact edges, and reasonable performance in producing depth estimates for the magnetic contacts. Results obtained using aeromagnetic data from the Finger Lakes region of New York State show good correlation with known structural features.

scholarly journals Inferring the Subsurface Basement Depth and the Contact Locations from Aeromagnetic Data over Loum-Minta Area (Centre-East Cameroon)

2018 ◽  
Vol 09 (07) ◽  
pp. 435-459
Author(s):  
Jean Aimé Mono ◽  
Theophile Ndougsa-Mbarga ◽  
Marcelin Bikoro Bi-Alou ◽  
Jean Daniel Ngoh ◽  
Olivier Ulrich Owono
Keyword(s):  
Aeromagnetic Data ◽  
Basement Depth
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