Use of Full Tensor Gravity Invariants in Detection of Intrusion-hosted Sulphide Mineralization: Implications for Emplacement Mechanisms

Mataragio, James; Kieley, John

doi:10.1190/sbgf2009-159

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…Klokočník et al (2014) used gravity disturbances and invariants with suggestions of geomorphological and geodynamic interpretations for further studies. 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.…”

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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“…This is attributable to the fact that gravity gradiometry was superseded by gravimetry in oil and gas exploration by the 1930s (LaFehr, 1980) and was revived only after the end of the Cold War in the 1990s, when the United States Navy declassified the military technology developed in the 1970s based on accelerometers (DiFrancesco et al, 2009). Since then, gravity gradiometry has had successful application in exploration problems (e.g., Bell et al, 1997;Huston et al, 1999;Mataragio and Kieley, 2009;Hatch and Annecchione, 2010;Ennen and Hall, 2011;Martinez et al, 2013;). The technology is naturally studied for its use in a time-lapse setting (e.g., Talwani et al, 1999;DiFrancesco and Talwani, 2002;Vasilevsky et al, 2003Vasilevsky et al, , 2005Kirkendall and Li, 2007;Amano and Yamamoto, 2013;Reitz, 2014).…”

Section: Time-lapse Gravity and Gravity Gradiometrymentioning

confidence: 96%

Feasibility of time-lapse gravity and gravity gradiometry monitoring for steam-assisted gravity drainage reservoirs

Reitz

Krahenbuhl

2015

GEOPHYSICS

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There is presently an increased need to monitor production efficiency as heavy oil reservoirs become more economically viable. We present a feasibility study of monitoring steam-assisted gravity drainage (SAGD) reservoirs using time-lapse gravimetry and gravity gradiometry. Even though time-lapse seismic has historically shown great success for SAGD monitoring, the gravimetry and gravity gradiometry methods offer a low-cost interseismic alternative that can complement the seismic method, increase the survey frequency, and decrease the cost of monitoring. In addition, both gravity-based methods are directly sensitive to the density changes that occur as a result of the replacement of heavy oil by steam. Advances in technologies have made both methods viable candidates for consideration in time-lapse reservoir monitoring, and we have numerically evaluated their potential application in monitoring SAGD production. The results indicate that SAGD production should produce a strong anomaly for both methods at typical SAGD reservoir depths. However, the level of detail for steam-chamber geometries and separations that can be recovered from the gravimetry and gravity gradiometry data is site dependent. Gravity gradiometry shows improved monitoring ability, such as better recovery of nonuniform steam movement due to reservoir heterogeneity, at shallower production reservoirs. Gravimetry has the ability to detect SAGD steam-chamber growth to greater depths than does gravity gradiometry, although with decreasing resolution of the expanding steam chambers.

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“…Therefore, demand for the interpretation methods of gradient tensor data has increased in geologic research. Meanwhile, many new processing and interpretation methods were proposed by using the methods of invariants or 432 C 2017 European Association of Geoscientists & Engineers eigenvalues of gradient tensor (Mataragio and Kieley 2009;Beiki and Pedersen 2010;Oruc 2010;Zhou 2016). The tensor Euler deconvolution method was developed by Zhang et al (2000), further enhancing the performance of data interpretation.…”

Section: Introductionmentioning

confidence: 99%

Depth from extreme points method for gravity gradient tensor data

Zhou

Liu

2017

Geophysical Prospecting

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The ‘depth from extreme points’ method is an important tool to estimate the depth of sources of gravity and magnetic data. In order to interpret gravity gradient tensor data conveniently, formulas for the tensor data form regarding depth from the extreme points method were calculated in this paper. Then, all of the gradient tensor components were directly used to interpret the causative source. Beyond the gzz component, also the gxx and gyy components can be used to obtain depth information. In addition, the total horizontal derivative of the depth from extreme points of the gradient tensor can be used to describe the edge information of geologic sources. In this paper, we investigated the consistency of the homogeneity degree calculated by using the different components, which leads to the calculated depth being confirmed. Therefore, a more integrated interpretation can be obtained by using the gradient tensor components. Different synthetic models were used with and without noise to test the new approach, showing stability, accuracy and speed. The proposed method proved to be a useful tool for gradient tensor data interpretation. Finally, the proposed method was applied to full tensor gradient data acquired over the Vinton Salt Dome, Louisiana, USA, and the results are in agreement with those obtained in previous research studies.

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Use of Full Tensor Gravity Invariants in Detection of Intrusion-hosted Sulphide Mineralization: Implications for Emplacement Mechanisms

Cited by 4 publications

References 3 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

Feasibility of time-lapse gravity and gravity gradiometry monitoring for steam-assisted gravity drainage reservoirs

Depth from extreme points method for gravity gradient tensor data

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