Development of tailored gravity model based on global gravitational and topographic models and terrestrial gravity data for geophysical exploration of southern benue trough in southeast Nigeria

Apeh, Ojima Isaac; Tenzer, Robert

doi:10.1016/j.jappgeo.2022.104561

Cited by 11 publications

(12 citation statements)

References 36 publications

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“…Global Gravitational Models (GGMs) approximate the external gravitational potential of an attracting body such as the Earth (Apeh et al, 2018;Apeh and Tenzer, 2022). Five high resolutions and five low resolutions were adopted in the research.…”

Section: Global Gravitational Modelmentioning

confidence: 99%

Insight into the Global Gravity Models for Free-Air Gravity Estimation using Land Gravity Data

TATA

2024

Nova Geodesia

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Gravity anomalies are used for the interpretation of the structures which are beneath the Earth. The availability of gravity anomalies at the early stage of exploration activities makes determining characteristics, forms and location properties beneath the Earth’s crust possible. Different GGMs have different accuracies due to factors such as differences in sources of data and the mode of their formulation. It is essential to know the efficiency of models over an area before being used for serious activity over the area. This research evaluated gravity anomaly derived from Global Gravity Models to determine the best-fit model over Akure City, Nigeria, by accessing ten gravitational models over twenty-three geodetic control points. Free-Air was the Gravity field model, calculated through the ten Global Gravity field Models over the study area. The computations of the anomalies were done at the International Centre for Global Earth Models (ICGEM). Terrestrial gravity anomaly data acquired was the standard against the ten model-based gravity anomalies using a coefficient of correlation and T-test to determine the best models over the area. Based on correlation analysis, SGG_UGM_2 has a value of 0.5995, and EGM2008 was 0.5973, respectively. The two models are the best fit for the study area. Based on the T-test for Free-Air anomaly data, EGM2008 and GECO have no significant difference from the terrestrial gravity models having P-values of 0.0393 mgal and 0.0146 mgal, respectively. This research, therefore, underscores the significance of adopting the best-fit model over the study area.

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Section: Global Gravitational Modelmentioning

confidence: 99%

Insight into the Global Gravity Models for Free-Air Gravity Estimation using Land Gravity Data

TATA

2024

Nova Geodesia

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“…The bouguer correction is a mathematical adjustment applied to gravity measurements to account for the gravitational effects of near-surface masses, such as rocks, soil, and water, in addition to the free-air correction. It compensates for the gravitational attraction of the mass between the measurement point and a reference level, taking into account both the elevation difference and the mass distribution in the subsurface [16].…”

Section: Bouguer Correctionmentioning

confidence: 99%

Geological Structure Model for Recharge Area in Patuha Geothermal Field

Indriani,

Anjasmara,

Utama

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Geothermal sustainability requires geological structure analysis using gravity methods for groundwater management. Geological structure analysis reviews fault data. Geological structure as a pathway for fluid movement for groundwater management in the research area, especially the Patuha Geothermal Field, West Java. This study uses global gravity model, terrestrial gravity, DEM, and geological data. The gravity method applied in this research involves calculations for latitude correction, free air correction, bouguer correction and terrain correction. The final results of this research are free air anomaly, complete Bouguer anomaly, and model evaluation (MRSE, MRE, and MAE). Free air anomaly results from free air correction of global gravity model data. DEM topography analyzes free air anomaly. The FAA data model evaluated RMSE at 1.27, MRE at 0.004, and MAE at 0.83. 138.02–280.26 mgal is the FAA range. The research area’s elevation range is 836–2431 m. Topography and free air anomaly correlate 0.75. Positive high connection. Mountains and plateaus may have positive gravity anomalies. Free air, bouguer, terrain, and CBA are applied to global gravity model data. The CBA model evaluation indicates quality. RMSE is 1.47, MRE is 0.012, and MAE is 1.11. CBA fluctuation implies fault spread. Faults serve as water flow conduits and channels, increasing the risk of infiltration. Meanwhile, cracks are being distributed as conduits and for infiltration. This research forms the basis for developing and increasing geothermal production so that further studies are needed regarding the influence of geological structures for reservoir in geothermal areas.

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“…Geological studies (e.g., Nwachukwu, 1972;Petters, 1978;Ofoegbu and Onuoha, 1991;Ojoh, 1992;Abbass and Mallam, 2013;Igwe et al, 2013;Abdullahi et al, 2019;Anudu et al, 2020;Apeh and Tenzer 2022) indicated the existence of ten major geological units in the Southern Benue Trough, consisting of the Asu River, Ezeaku, Awgu, Nkporo, Mamu, Ajali, Nsukka, Imo, Odukpani, and Precambrian basement. Studies also suggested that the Asu River group mostly comprises fractured shales and limestones with intercalations of sandstone within Abakaliki and Calabar Flank.…”

Section: Geological Settingmentioning

confidence: 99%

“…Aeromagnetic studies concentrated on delineating directions of trending lineaments and fault lines (structural pattern) within parts of the Southern BT, while gravimetric studies used only a very irregular and sparse network of gravity measurements. To achieve a more comprehensive and concise gravimetric interpretation of the whole area, we estimated the sediment thickness over the entire Southern BT in Nigeria and parts of the Cameroon Volcanic Line (CVL) by employing the highresolution synthetic gravity model prepared by Apeh and Tenzer (2022) in combination with geological evidence collected from 113 logged boreholes in order to validate our gravimetric inverse modelling results. The gravity inversion software GRV_D_inv, developed by Pharm et al (2021a), was used to determine a 3-D depth structure of the basement relief.…”

Section: Introductionmentioning

confidence: 99%

Estimation of the sediment thickness beneath the Southern Benue Trough in Nigeria by using gravity and borehole data

Apeh,

Tenzer,

Pham

et al. 2023

Earth sci. res. j.

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Mapping the sediment-basement morphology represents a crucial part of the geophysical exploration of oil, gas, and mineral resources. In this study, authors estimated the sediment thickness in the area covering the Southern Benue Trough in Nigeria and parts of the Cameroon Volcanic Line using a high-resolution tailored gravity model together with sediment and bedrock samples taken from 113 logged boreholes. A 3-D inversion of the residual gravity data is done by applying a recently developed time-efficient gravity inversion software to determine a 3-D depth structure of the basement relief after regional-residual gravity separation. The estimated depths of the sediment-basement based on a 3-D gravity data inversion are compared with the measured sediment thickness data from drilling profiles to optimally select the gravity inversion parameters, particularly the mean sediment depth, and density contrast. Our numerical result indicates that the sediment thickness within the Southern Benue Trough study area and parts of the Cameroon Volcanic Line vary from 0.8 to 5.5 km, with a prevailing southwest trend of increasing sediment thickness while decreasing eastward. This trend closely mimics the known geological structure of the study area and generally agrees with localized estimates of the sediment thickness from previous studies. Moreover, the Bouguer gravity map of the study area exhibits a spatial pattern that indicates an existence of a high-density material, which could have led to the shallowing of sediments over and along the Abakaliki Anticlinorium. Based on these findings, the authors argued that these magmatic structures could influence hydrothermal fluid migration and might have entrapped enough sediments suitable for the maturation of mineral resources over time.

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Development of tailored gravity model based on global gravitational and topographic models and terrestrial gravity data for geophysical exploration of southern benue trough in southeast Nigeria

Cited by 11 publications

References 36 publications

Insight into the Global Gravity Models for Free-Air Gravity Estimation using Land Gravity Data

Insight into the Global Gravity Models for Free-Air Gravity Estimation using Land Gravity Data

Geological Structure Model for Recharge Area in Patuha Geothermal Field

Estimation of the sediment thickness beneath the Southern Benue Trough in Nigeria by using gravity and borehole data

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