Imaging Techniques for Full Tensor Gravity Gradiometry Data

Dickinson, Jade L.; Brewster, James; Robinson, Jason; Murphy, Colm

doi:10.3997/2214-4609-pdb.241.dickinson_paper1

Cited by 9 publications

(4 citation statements)

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“…Mataragio and Kieley (2009) used gradient invariants for detection sulfide mineralization area. Dickinson et al (2009) used gravity tensor and invariants for a project of hydrocarbon and mineral exploration. Murphy and Dickinson (2010) used full tensor gravity data for geological mapping and locating geological boundaries.…”

Section: Introductionmentioning

confidence: 99%

Analysis of gravity disturbance for boundary structures in the Aegean Sea and Western Anatolia

Doğru

Pamukçu

2019

Geofizika

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Western Anatolia has been shaped N–S-trending extensional tectonic regime and W-E trending horst, grabens and active faults due to the collision of Africa, Arabian and Eurasia plates. The borders of the Aegean Sea tectonic is limited between eastern of Greece, western of Anatolia and Hellenic subduction zone in the south of Crete. To evaluate these tectonic elements gravity disturbance data of the Aegean Sea and Western Anatolia was used in this study. It is thought that the gravity disturbance data reflects the tectonic elements and discontinuities way better than gravity anomaly due to the calculation from the difference between gravity and normal gravity at the same point so thus the tensors and invariants of the study area were calculated and the power spectrum method was applied to the gravity disturbance data. Various boundary analysis methods were applied to the gravity disturbance data to compare the discontinuities obtained from the tensors both theoretical and case study. These methods were tested initially on theoretical data. Within the scope of the theoretical study, a single model and three bodies model were taken into consideration. When the results are examined, it is observed that the Tzz tensor component gives very clear information about the location of the structure. Likewise, when the Txx, Tyy components and invariant results are examined, the vertical and horizontal boundaries were successfully obtained. In addition, the mean depths of these structures were determined using the power spectrum method. In the case application stage, the gravity disturbance data obtained from the Earth Gravitational Model of the eastern of the Aegean Sea and western of Anatolia were evaluated. The tensor and invariants of this gravity disturbance data were first calculated. New possible discontinuities have been identified in the tensors and some of the obtained discontinuities were clarified in their previous discussions. Also, the mean depths of the possible structures were calculated by the power spectrum method at four profiles taken from gravity disturbance data. These depth values are consistent with the depth values of the structural discontinuities obtained from previous studies. Finally, the upward continuation was applied to Tyy, Tyz and Tzz tensors up to 20 km. The positive anomaly values in Tyz and Tzz components and negative anomaly values in Tyy component are consistent with the Western Anatolia Transfer Zone. The structural differences between the eastern and the western of Western Anatolia are noteworthy in the upward continued results of the tensors. In addition, the positive and negative anomalies are notable in areas where the big earthquakes occurred in the last 3 years in the Tyz invariants.

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Section: Introductionmentioning

confidence: 99%

Analysis of gravity disturbance for boundary structures in the Aegean Sea and Western Anatolia

Doğru

Pamukçu

2019

Geofizika

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“…To demonstrate the effectiveness of our algorithm, we tested both on a synthetic and a field dataset from the Vinton salt dome by Bell Geospace [29] and compared the improved FCM clustering inversion with focusing inversion and conventional FCM clustering inversion in the examples. In the following examples, the open-source software TetGen [25] is used to generate tetrahedral grids.…”

Section: Resultsmentioning

confidence: 99%

“…The survey area Vinton Dome is located in southwestern Louisiana, USA. We used a subset of the survey area for this study that covers approximately 16 km 2 in the middle of the survey area, which was acquired and processed by Bell Geospace in 2008 [29]. Before we inverted the data, a second-order trend surface was removed to get rid of background, and an upward continuation of 100 m was done to eliminate the shallow local anomalies.…”

Section: Field Data Inversionmentioning

confidence: 99%

3D Gravity Inversion on Unstructured Grids

2021

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Compared with structured grids, unstructured grids are more flexible to model arbitrarily shaped structures. However, based on unstructured grids, gravity inversion results would be discontinuous and hollow because of cell volume and depth variations. To solve this problem, we first analyzed the gradient of objective function in gradient-based inversion methods, and a new gradient scheme of objective function is developed, which is a derivative with respect to weighted model parameters. The new gradient scheme can more effectively solve the problem with lacking depth resolution than the traditional inversions, and the improvement is not affected by the regularization parameters. Besides, an improved fuzzy c-means clustering combined with spatial constraints is developed to measure property distribution of inverted models in both spatial domain and parameter domain simultaneously. The new inversion method can yield a more internal continuous model, as it encourages cells and their adjacent cells to tend to the same property value. At last, the smooth constraint inversion, the focusing inversion, and the improved fuzzy c-means clustering inversion on unstructured grids are tested on synthetic and measured gravity data to compare and demonstrate the algorithms proposed in this paper.

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“…There are three invariants for the coordinate transformation and they are described by the following equations (Dickinson et al, 2009). I 0 = Trace(Γ) = 0…”

Section: Gravity Gravity Gradiometry and Magnetic Enhancementsmentioning

confidence: 99%

Airborne Gravity Gradiometry Survey in the Southeastern Portion of Pimenta Bueno Graben in Parecis Basin: Integrated 2d Forward Modeling and Its Implications in Defining a New Structural Framework

Cunha¹,

Perosi²,

Braga³

et al. 2015

Rev. Bras. Geof.

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ABSTRACT. Airborne geophysical surveys are widely used in geological prospecting of hydrocarbon reservoirs. The efficiency and acquisition speed of these methods in covering large areas accredit them as a key tool for any exploration project where there are sparse technical data available to support the exploratory decisions. Among the airborne geophysical methods, potential methods, namely, gravity and magnetics are the most spread in oil & gas projects of this nature. Such methods are used to support the generation of regional geological knowledge and also in detailed approaches, integrated with seismic, geochemical and well data. The objectives of this work were to describe the FalconTM Airborne Gravity Gradiometry System, explaining acquisition and processing steps, and crosscheck the results of its application in the southeastern portion of the Parecis Basin with two proposed models for the structural genesis and evolution proposed by the academy. Throughout the integration of the airborne gravity gradiometry and magnetic data along 2D seismic section it was possible to infer the geometry of the Pimenta Bueno Graben. While many works have mapped basement depth about 7,000 m, the current modeling shows basement deeper than 10,000 m.Keywords: airborne gravity gradiometry, 2D forward modeling, Parecis Basin, FalconTM, tectonic framework.RESUMO. Levantamentos aerogeofísicos são amplamente utilizados na prospecção geológica de reservatórios de hidrocarbonetos. A eficiência e a velocidade de aquisição desses métodos na cobertura de grandes áreas os credenciam como uma ferramenta fundamental para qualquer projeto de exploração onde há poucos dados técnicos disponíveis para apoiar as decisões exploratórias. Dentre os métodos geofísicos aéreos, os potenciais gravimétricos e magnetométricos são os mais utilizados em projetos da natureza de prospecção de óleo e gás. Tais métodos são utilizados para apoiar a geração de conhecimento geológico regional e também em abordagens de detalhe, integrados com seções sísmicas, dados geoquímicos e de poço. Este trabalho pretende apresentar o Sistema FalconTM de Gravimetria Gradiométrica, descrevendo suas etapas de aquisição e processamento, e interpretação dos resultados de sua aplicação na porção sudeste da Bacia do Parecis, em confronto com dois modelos propostos para a gênese e evolução estrutural da Bacia. Através da integração dos dados de gravimetria gradiométrica com dados magnéticos extraídos ao longo da secção sísmica 2D foi possível inferir a geometria detalhada do graben de Pimenta Bueno. Enquanto trabalhos anteriores mapearam a profundidade do embasamento em cerca de 7.000 metros, uma modelagem 2D direta e vinculada mostra que o mesmo pode alcançar, de forma localizada, profundidades maiores que 10.000 metros.Palavras-chave: gravimetria gradiométrica aérea, modelagem direta 2D, Bacia dos Parecis, FalconTM, arcabouc¸o tectônico.

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Imaging Techniques for Full Tensor Gravity Gradiometry Data

Cited by 9 publications

References 0 publications

Analysis of gravity disturbance for boundary structures in the Aegean Sea and Western Anatolia

Analysis of gravity disturbance for boundary structures in the Aegean Sea and Western Anatolia

3D Gravity Inversion on Unstructured Grids

Airborne Gravity Gradiometry Survey in the Southeastern Portion of Pimenta Bueno Graben in Parecis Basin: Integrated 2d Forward Modeling and Its Implications in Defining a New Structural Framework

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