scholarly journals Structure of the Marathon basin (NE Attica, Greece) based on gravity measurements

2018 ◽  
Vol 40 (3) ◽  
pp. 1063 ◽  
Author(s):  
S. Chailas ◽  
A. Tzanis ◽  
E. Lagios
Keyword(s):  
High Resolution ◽  
Bouguer Anomaly ◽  
Structural Features ◽  
Normal Faults ◽  
Block Rotation ◽  
Aquifer System ◽  
Standard Data ◽  
Gravity Measurements ◽  
Anomaly Map ◽  
Bouguer Anomaly Map

This work presents the results of a high resolution gravity survey conducted in the area of Marathon Basin to asses the structure of the basement. A total of 120 gravity stations were measured. Standard data reduction procedures were followed, albeit based on modern, high precision techniques. The inversion of the Bouguer anomaly map provided a rather detailed image of the basement topography completing the information available from surface geological and morphological surveys. The major structural features of the Marathon Basin appear to be controlled by a system of NE-SW neotectonic faults causing stepwise NW-SE deepening of the basement to a maximum detectable depth of~450m. These faults, together with a system of NW-SE major, and a host of minor faulting features, lend to the Basin characteristics of a Riedel structure formed by a predominantly N-S extensional field effecting clockwise block rotation. This mode of deformation may also have facilitated the formation of local anticlinal/ synclinal structures, which endow the area with its rather complicated morphology. Finally, the multiple intersecting faults appear to form a permeable network, presumably responsible for the salination of the local aquifer system; the NE-SW major normal faults may the most significant contributor to this effect.

Gravity Survey of King Fahd University of Petroleum and Minerals Dammam Dome, Saudi Arabia

2021 ◽  
Author(s):  
Pantelis Soupios ◽  
Alexandros Stampolidis ◽  
Maurizio Fedi ◽  
SanLinn Kaka ◽  
Khalid Al-Ramadan ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Gravity Data ◽  
Bouguer Anomaly ◽  
3D Models ◽  
Low Noise ◽  
Gravity Survey ◽  
Differential Gps ◽  
Gravity Measurements ◽  
Anomaly Map ◽  
Bouguer Anomaly Map

Abstract The study area is a part of Dammam Dome that is situated at King Fahd University of Petroleum & Minerals (KFUPM) campus, Dhahran, Kingdom of Saudi Arabia. The gravity survey was conducted as a pilot case study to explore part of Dammam Dome in greater detail. Gravity data were collected solely during night hours due to low noise levels. A significant part of the survey was conducted during the summer holiday period, , when there was no student are on campus. A total of 235 gravity measurements were made using a Scintrex CG5 gravitometer, while a Trimble R10+ differential GPS (DGPS) was used to measure the stations’ location and elevation with the highest accuracy. All gravity data were reduced using several algorithms, and their outcomes were cross-compared. The Complete Bouguer anomaly map for the campus was then generated. Several enhancement filters including edged detection and shallow to deeper source separation were applied. Data were inverted, and 2.5D and 3D models were created to image the subsurface conditions. The main purpose of this study is to better understand the subsurface geology, tectonic settings of the Dammam Dome by applying the high-resolution gravity method before carrying out any comprehensive geophysical (seismic) 3D survey.

scholarly journals Caracterização Estrutural da Região Central do Graben do Cupe, Bacia Sedimentar de Pernambuco: Implicações para o Padrão Atual da Rede de Drenagem

2020 ◽  
Vol 13 (5) ◽  
pp. 2355
Author(s):  
João Carlos Morais de Araújo Júnior ◽  
Willian Alexandre De Lima Moura ◽  
Isis Mayara Gomes da Silva ◽  
Osvaldo José Correia Filho ◽  
João Adauto De Souza Neto
Keyword(s):  
Central Region ◽  
Structural Characterization ◽  
Bouguer Anomaly ◽  
Border Region ◽  
Normal Faults ◽  
Structural Framework ◽  
Gravimetric Data ◽  
Anomaly Map ◽  
Bouguer Anomaly Map

A área de estudo está inserida no contexto geológico do Graben do Cupe, região de borda da Bacia Sedimentar de Pernambuco (BPE) com o embasamento cristalino adjacente. O Graben do Cupe é considerado um importante depocentro da região onshore dessa bacia e sua origem está ligada à abertura do Oceano Atlântico Sul. A partir da integração de dados gravimétricos, dados altimétricos obtidos por LIDAR e dados de campo, foi possível realizar uma caracterização estrutural dos principais lineamentos gravimétricos e topográficos que cortam a região central do Graben do Cupe. O mapa de anomalia bouguer residual revelou que o arcabouço estrutural mais profundo da BPE é representado por falhas normais de direção NE-SW, bem como falhas transcorrentes sinistrais, de direção NW-SE e dextrais ENE-WSW. A mesma orientação de lineamentos topográficos foi obtida através da interpretação dos dados altimétricos. Os rios inseridos na área de estudo seguem a mesma orientação dos lineamentos topográficos e gravimétricos, NW-SE e NE-SW. O mapeamento estrutural revelou que os lineamentos gravimétricos e topográficos estão associados à direção da foliação NE-SW, presente no embasamento adjacente a bacia, e às falhas originadas durante a fase rifte da BPE; A) NE-SW e NNE-SSW caracterizadas como falhas normais e B) NW-SE que corresponde a falhas oblíquas. As estruturas mais profundas tanto do embasamento, quanto as estruturas rifte que compartimentam o Graben do Cupe foram responsáveis por controlar a evolução quaternária da paisagem, o que provocou a captura da drenagem de alguns cursos fluviais, e o significante condicionamento tectônico dos vales fluviais.  Structural Characterization of the Central Region of the Graben Cupe, Pernambuco Sedimentary Basin: Implications for the Current Pattern of the Drainage Network A B S T R A C TThe study area is inserted in the geological settings of the Cupe Graben, which is located in the border region of the Pernambuco Basin with the adjacent crystalline basement. The Cupe Graben is considered an important depocenter in the onshore region of this basin and its origin is linked to the opening of the South Atlantic Ocean. From the integration of gravimetric data, altimetric data obtained by LIDAR and field data, it was possible to carry out a structural characterization of the main gravimetric and topographic lineaments that cut the central region of Cupe Graben. The residual bouguer anomaly map revealed that the deep structural framework of the BPE is represented by normal faults NE-SW and NNE-SSW and sinistral strike slip faults NW-SE. The same orientation of topographic lineaments was obtained through the interpretation of the topographic lineaments. The rivers inserted in the study area have the same orientation as the topographic and gravimetric lineaments, NW-SE and NE-SW. The structural mapping revealed that the gravimetric and topographic lineaments are related to foliation in the adjacent basement NE-SW, and the faults originated during the BPE rift phase; A) NE-SW and NNE-SSW characterized as normal faults and B) NW-SE which corresponds to oblique faults. The deeper structures of both the basement and the rift structures that constraint the Cupe Graben were responsible for controlling the quaternary evolution of the landscape, which caused the capture of the drainage of some rivers, and the strong conditioning of the drainage network.Keywords: Cupe Graben, Pernambuco Basin, structural geology, river capture.

Integrated seismic and gravimetric model of Jocolí Basin, Argentina

2014 ◽  
Vol 2 (2) ◽  
pp. T57-T68
Author(s):  
Patricia Martinez ◽  
Mario Gimenez ◽  
Andres Folguera ◽  
Federico Lince Klinger
Keyword(s):  
Oil And Gas ◽  
Deep Structure ◽  
Bouguer Anomaly ◽  
Gravity Models ◽  
Oil And Gas Exploration ◽  
Fold And Thrust Belt ◽  
Gravity Measurements ◽  
Anomaly Map ◽  
Bouguer Anomaly Map ◽  
Well Data

Gravity measurements and reinterpretations of previously released seismic lines were made, focusing on the provincial border between neighboring provinces San Juan and Mendoza. A Bouguer anomaly map was obtained after the processing of gravimetric data, which were previously filtered, to obtain the Bouguer residual anomalies used for studying the geologic structures located on the upper crust. The analysis of these Bouguer residual anomalies allowed identification of the Jocolí Basin in a foreland position within a triangle zone at the boundary of the Precordillera fold-and-thrust belt with the Sierras Pampeanas thick-skinned foreland province. The seismic images allowed interpretation of three horizons: Paleozoic, Triassic, and Tertiary-Quaternary ages. The authors have reinterpreted the seismic and well data and reconstructed gravity models for the area under study aiming at unraveling the deep structure of the region and identifying features with potential for oil and gas exploration.

Tectonic insight and 3-D modelling of the Lusi (Java, Indonesia) mud edifice through gravity analyses

2021 ◽  
Vol 225 (2) ◽  
pp. 984-997
Author(s):  
Álvaro Osorio Riffo ◽  
Guillaume Mauri ◽  
Adriano Mazzini ◽  
Stephen A Miller
Keyword(s):  
Risk Mitigation ◽  
Bouguer Anomaly ◽  
Geological Model ◽  
Resource Exploitation ◽  
Subsurface Structures ◽  
Central Java ◽  
Geostatistical Interpolation ◽  
Gravity Response ◽  
Anomaly Map ◽  
Bouguer Anomaly Map

SUMMARY Lusi is a sediment-hosted hydrothermal system located near Sidoarjo in Central Java, Indonesia, and has erupted continuously since May 2006. This mud eruption extends over a surface of ∼7 km2, and is framed by high containment dams. The present study investigates the geometry of the subsurface structures using a detailed gravimetric model to visualize in 3-D the Lusi system and surrounding lithologies. The obtained residual Bouguer anomaly map, simulated through geostatistical interpolation methods, supports the results of previous deformation studies. The negative gravity anomaly zones identified at Lusi are interpreted as fractured areas through which fluids can ascend towards the surface. A 3-D detailed geological model of the area was constructed with Geomodeller™ to highlight the main features. This model relies on the structures’ density contrasts, the interpreted residual Bouguer anomaly map, and geological data from previous authors. 3-D algorithms were used to calculate the gravity response of the model and validate it by inverse methods. The final output is a gravity constrained 3-D geological model of the Lusi mud edifice. These results provide essential details on the Lusi subsurface and may be useful for possible future geothermal resource exploitation and for the risk mitigation plans related to the maintenance of the man-made framing embankment.

scholarly journals Geophysical perspective on the structural interference zone along the Neoproterozoic Brasília and Ribeira fold belts in West Gondwana

2017 ◽  
Vol 47 (1) ◽  
pp. 3-19
Author(s):  
João Gabriel Motta ◽  
Norberto Morales ◽  
Walter Malagutti Filho
Keyword(s):  
Bouguer Anomaly ◽  
Shear Zones ◽  
Magnetic Data ◽  
Gravity Modeling ◽  
West Gondwana ◽  
Fold And Thrust Belt ◽  
Fold Belts ◽  
Thrust Sheets ◽  
Anomaly Map ◽  
Bouguer Anomaly Map

ABSTRACT: The Brasília and Ribeira fold belts have been established in south-southwestern São Francisco Craton during the Brasiliano-Pan African orogeny (0.9-0.5 Ga - Tonian to Cambrian), and played an important role in West Gondwana continent assembly. The region is given by a complex regional fold and thrust belt superposed by shearing during the orogeny late times, with superposing stress fields forming a structural interference zone. These thrust sheets encompasses assemblies from lower- to upper-crust from different major tectonic blocks (Paranapanema, São Francisco), and newly created metamorphic rocks. Re-evaluation of ground gravity datasets in a geologically constrained approach including seismology (CRUST1 model) and magnetic data (EMAG2 model) unveiled details on the deep- crust settings, and the overall geometry of the structural interference zone. The Simple Bouguer Anomaly map shows heterogeneous density distribution in the area, highlighting the presence of high-density, high metamorphic grade rocks along the Alterosa suture zone in the Socorro-Guaxupé Nappe, lying amid a series of metasedimentary thrust scales in a regional nappe system with important verticalization along regional shear zones. Forward gravity modeling favors interpretations of structural interference up North into Guaxupé Nappe. Comparison to geotectonic models shows similarities with modern accretionary belts, renewing the discussion.

scholarly journals Geometrical Characterisation of the Mamfe Basin, Cameroon, from the Earth, Gravitational Model (EGM 2008)

2018 ◽  
Vol 7 (1) ◽  
pp. 94
Author(s):  
Anatole Eugene Djieto Lordon ◽  
Mbohlieu YOSSA ◽  
Christopher M Agyingi ◽  
Yves Shandini ◽  
Thierry Stephane Kuisseu
Keyword(s):  
Average Length ◽  
Gravity Data ◽  
Bouguer Anomaly ◽  
Igneous Rocks ◽  
Average Depth ◽  
The Earth ◽  
Gravitational Model ◽  
Petroleum Generation ◽  
Anomaly Map ◽  
Bouguer Anomaly Map

Gravimetric studies using the ETOPO1-corrected high resolution satellite-based EGM2008 gravity data was used to define the surface extent, depth to basement and shape of the Mamfe basin. The Bouguer anomaly map was produced in Surfer 11.0. The Fast Fourier Transformed data was analyzed by spectral analysis to remove the effect of the regional bodies in the study area. The residual anomaly map obtained was compared with the known geology of the study area, and this showed that the gravity highs correspond to the metamorphic and igneous rocks while the gravity lows match with Cretaceous sediments. Three profiles were drawn on the residual anomaly map along which 2D models of the Mamfe basin were drawn. The modeling was completed in Grav2dc v2.06 software which uses the Talwini’s algorithm and the resulting models gave the depth to basement and the shape of the basement along the profiles. After processing and interpretation, it was deduced that the Mamfe basin has an average length and width of 77.6 km and 29.2 km respectively, an average depth to basement of 5 km and an overall U-shape basement. These dimensions (especially the depth) theoretically create the depth and temperature conditions for petroleum generation. 

scholarly journals New Bouguer Anomaly Map for the Territory of the Slovenia

2021 ◽  
Vol 13 (22) ◽  
pp. 4510
Author(s):  
Klemen Medved ◽  
Oleg Odalović ◽  
Božo Koler
Keyword(s):  
Gravity Anomaly ◽  
Significant Influence ◽  
Bouguer Anomaly ◽  
High Quality ◽  
Digital Terrain ◽  
Terrain Models ◽  
Gravimetric Data ◽  
The Republic ◽  
Anomaly Map ◽  
Bouguer Anomaly Map

The existing Bouguer anomaly map, which covers the territory of the Republic of Slovenia is a few decades old. Since then, quite a few new gravimetric measurements (data) for the territory of Slovenia as well as high quality digital terrain models that are needed for creating such a map have been made available. The methodology and standards for creating gravity anomaly maps are also changing. Thus, the national Bouguer anomaly map was updated. There were some gross errors detected in the set of old gravimetric data. Additionally, the influence of new updated gravimetric data was analyzed. The comparison of the various maps and the analysis of the influence of input gravimetric data indicates that the new gravimetric data of Slovenia has a significant influence on the creation of the gravimetric anomaly maps for Slovenia (even over 30 mGals at some points).

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