2D Seismic Data Images A Fold And Thrust Belt In Noerthwestern Venezuela

Multiple often and always appear in marine seismic data due to very high acoustic impedance contrasts. These events have undergone more than one reflection. This causes the signal to arrive back at the receiver at an erroneous time, which, in turn, causes false results and can result in data misinterpretation. Several types of multiple suppression have been studied in literature. Methods that attenuate multiples can be classified into three broad categories: deconvolution methods; filtering methods and wavefield prediction subtraction methods. The study area is situated on Seram Sea in between 131°15’E – 132°45’E and 3°0’S – 4°0’S, Seram Trough which is located beneath Seram Sea at northern part of the Banda-Arc – Australian collision zone and currently the site of contraction between Bird’s Head and Seram. This research uses predictive deconvolution and FK-filter to attenuate short period multiple from their move out, then continued by SRME method to predict multiple that cannot be attenuated from previous method, then followed by Radon transform to attenuate multiple that still left and cannot be attenuated by SRME method. The result of each method then compared to each other to see how well multiple attenuated. Predictive deconvolution and F-K filter could not give satisfactory result especially complex area where multiple in dipping event is not periodic, SRME method successfully attenuate multiple especially in near offset multiple without need subsurface information, while SRME method fails to attenuate long offset multiple, combination of SRME method and Radon transform can give satisfactory result with careful selection of the Radon transform parameters because it can obscure some primary reflectors. Based on geological interpretation, Seram Trough is built by dominant structural style of deposited fold and thrust belt. The deposited fold and thrust belt has a complexly fault geometry from western zone until eastern of seismic line.

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Controls on the evolution of passive-margin salt basins: Structure and evolution of the Salina del Bravo region, northeastern Mexico

Geological Society of America Bulletin ◽

10.1130/b35283.1 ◽

2019 ◽

Vol 132 (5-6) ◽

pp. 997-1012 ◽

Cited By ~ 3

Author(s):

Michael R. Hudec ◽

Tim P. Dooley ◽

Frank J. Peel ◽

Juan I. Soto

Keyword(s):

Seismic Data ◽

Passive Margin ◽

Salt Tectonics ◽

Structural Systems ◽

Thrust Belt ◽

Entire Region ◽

Fold And Thrust Belt ◽

Gravity Driven ◽

Northeastern Mexico ◽

Uplift History

Abstract Passive-margin salt basins tend to be much more deformed than their nonsalt equivalents, but they are by no means all the same. We used seismic data to study the Salina del Bravo region, northeast Mexico, to investigate the ways in which margin configuration and postsalt uplift history can influence passive-margin salt tectonics. The Salina del Bravo area contains four main structural systems, all of which trend NNE across the entire region. These structures are the Bravo trough, Sigsbee salt canopy, Perdido fold-and-thrust belt, and BAHA high. Gravity-driven deformation did not begin until more than 130 m.y. after salt deposition, because of buttressing against the BAHA high. We suggest that deformation was ultimately triggered in the Cenozoic by Cordilleran uplift that tilted the margin seaward and created a major sediment source terrane. Sediments shed from the uplift expelled salt seaward to form the Sigsbee canopy. At the same time, tilted and loaded sediments were translated seaward on the Louann salt until they were buttressed against the BAHA high, forming the Perdido fold-and-thrust belt. A physical model was built to test this hypothesis. The model was able to reproduce most of the major structures in the region, suggesting that the hypothesis is reasonable. The Salina del Bravo region shows how a downdip buttress can inhibit gravity-driven salt deformation in passive-margin salt basins. Furthermore, the area also shows the importance of postsalt uplift, which can destabilize a margin through a combination of tilting and sedimentation.

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Analysis of structural trends of sub-sea-floor strata in the Isfjorden area of the West Spitsbergen Fold-and-Thrust Belt based on multichannel seismic data

Journal of the Geological Society ◽

10.1144/jgs2012-109 ◽

2013 ◽

Vol 170 (4) ◽

pp. 657-668 ◽

Cited By ~ 10

Author(s):

Maria Blinova ◽

Jan Inge Faleide ◽

Roy H. Gabrielsen ◽

Rolf Mjelde

Keyword(s):

Seismic Data ◽

Thrust Belt ◽

The West ◽

Sea Floor ◽

Fold And Thrust Belt ◽

West Spitsbergen ◽

Multichannel Seismic Data

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Strike-slip reactivation of a Paleogene to Miocene fold and thrust belt along the central part of the Mid-Hungarian Shear Zone

Geologica Carpathica ◽

10.2478/v10096-010-0030-3 ◽

2010 ◽

Vol 61 (6) ◽

pp. 483-493 ◽

Cited By ~ 8

Author(s):

Márton Palotai ◽

László Csontos

Keyword(s):

Shear Zone ◽

Seismic Data ◽

Tectonic Evolution ◽

Strike Slip ◽

3D Seismic ◽

Thrust Belt ◽

Clockwise Rotation ◽

Fold And Thrust Belt ◽

Detailed Interpretation ◽

3D Seismic Data

Strike-slip reactivation of a Paleogene to Miocene fold and thrust belt along the central part of the Mid-Hungarian Shear ZoneRecently shot 3D seismic data allowed for a detailed interpretation, aimed at the tectonic evolution of the central part of the Mid-Hungarian Shear Zone (MHZ). The MHZ acted as a NW vergent fold and thrust belt in the Late Oligocene. The intensity of shortening increased westwards, causing clockwise rotation of the western regions, relatively to the mildly deformed eastern areas. Blind thrusting and related folding in the MHZ continued in the Early Miocene. Thrusting and gentle folding in the MHZ partly continued in the earliest Pannonian, and was followed by sinistral movements in the whole MHZ, with maximal displacement along the Tóalmás zone. Late Pannonian inversion activated thrusts and generated transpressional movements along the Tóalmás zone.

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Abstract: Fold and Thrust Belt Along the Western Flank of the Eastern Cordillera of Colombia: Style, Kinematics and Timing Constraints Derived >From Seismic Data and Detailed Surface Mapping

AAPG Bulletin ◽

10.1306/1d9bd303-172d-11d7-8645000102c1865d ◽

1998 ◽

Vol 82 (1998) ◽

Cited By ~ 2

Author(s):

Restrepo-Pace, Fabio Colmenares, Ca

Keyword(s):

Seismic Data ◽

Timing Constraints ◽

Thrust Belt ◽

Surface Mapping ◽

Eastern Cordillera ◽

Western Flank ◽

Fold And Thrust Belt ◽

Detailed Surface

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Abstract: Fold and Thrust Belt Along the Western Flank of the Eastern Cordillera of Colombia : Style, Kinematics and Timing Constraints Derived from Seismic Data and Detailed Surface Mapping

AAPG Bulletin ◽

10.1306/e4fd3a95-1732-11d7-8645000102c1865d ◽

1999 ◽

Vol 83 ◽

Author(s):

RESTREPO-PACE, PEDRO A., FABIO COLM

Keyword(s):

Seismic Data ◽

Timing Constraints ◽

Thrust Belt ◽

Surface Mapping ◽

Eastern Cordillera ◽

Western Flank ◽

Fold And Thrust Belt ◽

Detailed Surface

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Seismic Data, Geometry, Evolution, and Shortening in the Active Sulaiman Fold-and-Thrust Belt of Pakistan, Southwest of the Himalayas

AAPG Bulletin ◽

10.1306/a25fe3ab-171b-11d7-8645000102c1865d ◽

1994 ◽

Vol 78 ◽

Cited By ~ 1

Author(s):

Ishtiaq A. K. Jadoon (2), Robert D.

Keyword(s):

Seismic Data ◽

Thrust Belt ◽

Fold And Thrust Belt

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Mid-crustal detachment beneath southern Timor-Leste: seismic evidence for Australian basement in the Timor collision complex (and implications for prospectivity)

10.29118/ipa21-g-98 ◽

2021 ◽

Author(s):

T. R. Charlton

Keyword(s):

Seismic Data ◽

Passive Margin ◽

Petroleum Exploration ◽

Seismic Survey ◽

Normal Faults ◽

Thrust Belt ◽

Collision Complex ◽

Fold And Thrust Belt ◽

Timor Leste ◽

Seismic Sections

Seismic data originally acquired over SW Timor-Leste in 1994 shows two consistent seismic reflectors mappable across the study area. The shallower ‘red’ reflector (0.4-1s twt) deepens southward, although with a block-faulted morphology. The normal faults cutting the red marker tend to merge downward into the deeper ‘blue’ marker horizon (0.5-2.8s twt), which also deepens southward. Drilling intersections in the Matai petroleum exploration wells demonstrate that the red marker horizon corresponds to the top of metamorphic basement (Lolotoi Complex), while the blue marker horizon has the geometry of a mid-crustal extensional detachment. We see no indications for thrusting on the seismic sections below the red marker horizon, consistent with studies of the Lolotoi Complex at outcrop. However, surficial geology over much of the seismic survey area comprises a thin-skinned fold and thrust belt, established in 8 wells to overlie the Lolotoi Complex. We interpret the fold and thrust belt as the primary expression of Neogene arc-continent collisional orogeny, while the Lolotoi Complex represents Australian continental basement underthrust beneath the collision complex. In the seismic data the basal décollement to the thrust belt dips southward beneath the synorogenic Suai Basin on the south coast of Timor, and presumably continues southward beneath the offshore fold and thrust belt, linking into the northward-dipping décollement that emerges at the Timor Trough deformation front. The same seismic dataset has been interpreted by Bucknill et al. (2019) in terms of emplacement of an Asian allochthon on top of an imbricated Australian passive margin succession. These authors further interpreted a subthrust anticlinal exploration prospect beneath the allochthon, which Timor Resources plan to drill in 2021. This well (Lafaek) will have enormous significance not only commercially, but potentially also in resolving the long-standing allochthon controversy in Timor: i.e., does the Lolotoi Complex represent ‘Australian’ or ‘Asian’ basement?

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