Use of the Polynomial Separation and the Gravity Spectral Analysis to Estimate the Depth of the Northern Logone Birni Sedimentary Basin (CAMEROON)

Nguimbous-Kouoh, Jean Jacques; Ngos, Simon; Mbarga, Théophile Ndougsa; Manguelle-Dicoum, Eliézer

doi:10.4236/ijg.2017.812085

Cited by 9 publications

(9 citation statements)

References 13 publications

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“…Spectral analysis was carried out to determine the boundary of the regional Bouguer anomaly and the residual area of the study [18][19]. The results of this spectral analysis are then used to estimate the window width for gravity anomaly filtering [20].…”

Section: Resultsmentioning

confidence: 99%

Identification of Hydrocarbons Sub-Basin Based on Gravity Data Analysis in Lampung Area

Sarkowi

Wibowo

Minardi

et al. 2021

J. Penelit. Fis. Apl.

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Gravity Data analyses in Lampung area are carried out to identify potential hydrocarbon sub-basins. The hydrocarbon potential in the Lampung sub-basin is indicated by the presence of hydrocarbon seepage found in Wai Imus, Wai Tahmi, and from oil shown in Ratu-1 and Tujo-1 exploration wells. Spectrum analysis, filtering, gradient, and gravity anomaly modeling determine the presence of potential hydrocarbon sub-basins in the Lampung sub-basin. Our results show that the Bouguer anomaly in the Lampung sub-basin ranges from 0 mGal to 90 mGal. A high anomaly appears in the southern part associated with basement high and a low anomaly in the center area of the western region related to the existence of the large Sumatra fault zone. The Bouguer Anomaly spectrum analysis result shows that basement depth in the Lampung sub-basin is 2400 m to 4400 meters deep. Data analysis of residual Bouguer anomaly, SVD residual Bouguer anomaly, and fault structure identified 18 sub- hydrocarbon potential basins scattered in Way Kanan, Tulang Bawang Barat, Menggala, Mesuji, Terbanggi Besar - Seputih Surabaya (Central Lampung), Sukadana and Labuhan Maringgai (East Lampung) areas. Some volcanic paths were also identified from Ratu-1 well, and Tujo-1 well in the Lampung WKP block. 2.5D modeling results of residual Bouguer anomaly show Kasai, Muara Enim, and Air Benakat, respectively, overburdened rock formations deposited from the top, followed by the Gumai Formation, which acts as a seal formation, while the hydrocarbon reservoirs are from the Baturaja and Talang Akar Formation. Our subsurface depth model has been verified by Ratu-1 and Tujo-1 exploration well.

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Section: Resultsmentioning

confidence: 99%

Identification of Hydrocarbons Sub-Basin Based on Gravity Data Analysis in Lampung Area

Sarkowi

Wibowo

Minardi

et al. 2021

J. Penelit. Fis. Apl.

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“…The data interpretation was carried out by first, gridding [10] using 100 m grid cell of the Oasis Montaj Software. Then the regional and residual anomalies were separated using a first order polynomial operation for the regional anomaly [11] after reduction to equator operation to reposition data as if collected on the equator [12] before improvement of data by enhancement of data [13; 14]. TMI maps [15] for the whole region, the regional anomaly and residual anomaly were produced analysis.…”

Section: Methodsmentioning

confidence: 99%

Sedimentary thickness and basement depths of eastern Niger delta, Nigeria, from aeromagnetic data and implications for hydrocarbon prospects

Eke¹,

Ombu²,

Onyeche³

2022

World J. Adv. Eng. Technol. Sci.

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A knowledge of sedimentary thickness and basement depths of a basin is necessary in understanding the structural set up of formations and evaluation of the hydrocarbon potentials of a region. In this work aeromagnetic data, obtained from the Nigerian Geological Survey Agency (NGSA) Abuja, has been interpreted to obtain sedimentary thickness, structural faults and intrusions including the basement depths of the eastern Niger Delta, Nigeria with the implications for hydrocarbon prospecting. Results from magnetic attribute analysis, total horizontal derivative operations, spectral analysis and source parameter imaging reveal the following: the study area is magnetically heterogeneous; the magnetic intensities range for the region is from – 46.2 nT to 160.3 nT, with residual magnetic intensity values of -15 nT to 13 nT revealing sediments with low magnetic rocks in the southwestern and southeastern parts of the study area and magnetic rocks and basement intrusions in the northwestern, northeastern and central parts of the study area; sedimentary thickness range from 96.5 m to 6601.5 m hosting faulted anticline and syncline structural bodies good enough for hydrocarbon formation and trapping and a maximum depth to basement of 6601.5 m. The sedimentary thickness and structural types, influenced by the basement intrusions, make the region a hydrocarbon potential area and it is recommended that prospecting in the southern and northern parts of the study area should be intensified.

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“…This method is based on polynomial decomposition series. It uses the least squares method to compute the mathematical surface giving the best fit to the data for a specified degree of detail [33,34,35,36]. This surface is considered the regional gravity anomaly.…”

Section: Polynomial Fitting Methodsmentioning

confidence: 99%

“…In practice, the regional surface is considered as two-dimensional polynomial. The order of this polynomial depends on the complexity of the geology of the study area [33,34,35,36]. The third order polynomial surfaces of the regional anomaly obtained in this work are presented along with the corresponding residual anomaly.…”

Section: Polynomial Fitting Methodsmentioning

confidence: 99%

Using EGM2008 Gravity Data for Mapping and Detecting Structural Subsurface Anomalies in the Mayo-Kani Division (Cameroon)

Nguimbous-Kouoh¹,

Ngos²,

Manguelle-Dicoum³

2019

JGG

Self Cite

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To resolve the problem of gravity mapping in the Mayo-Kani Division, we extracted a sample of data from the high-resolution Bouguer anomaly database EGM2008. The objective of this process was to map and detect subsurface anomalies in the region. Regional-residual separation was applied to the data using a third-order polynomial fit. This separation enables to obtain regional and residual maps. Other filtering actions, such as horizontal and vertical derivatives, have been applied to the data to enhance sources of anomalies in the study area. The residual map of the study area was superimposed on the geological map to delineate and interpret the correlation with the shallow geological structures. The main sources of residual gravity anomalies have been recognized. The interpretation of the derived maps revealed the N-S, E-W, NE-SW and NW-SE structural patterns. These trends have been associated with the major structural directions observed in the Far North Cameroon region. The Euler Deconvolution allowed the detection of sources of anomalies and to determine their depths. The fracture map obtained from this method has improved knowledge on the search for buried ores and the geological structures associated with oil and gas deposits. Overall, the generated gravity maps provided a better understanding of the Mayo-Kani geological setting.

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Use of the Polynomial Separation and the Gravity Spectral Analysis to Estimate the Depth of the Northern Logone Birni Sedimentary Basin (CAMEROON)

Cited by 9 publications

References 13 publications

Identification of Hydrocarbons Sub-Basin Based on Gravity Data Analysis in Lampung Area

Identification of Hydrocarbons Sub-Basin Based on Gravity Data Analysis in Lampung Area

Sedimentary thickness and basement depths of eastern Niger delta, Nigeria, from aeromagnetic data and implications for hydrocarbon prospects

Using EGM2008 Gravity Data for Mapping and Detecting Structural Subsurface Anomalies in the Mayo-Kani Division (Cameroon)

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