Structural Styles, Their Plate-Tectonic Habitats, and Hydrocarbon Traps in Petroleum Provinces

Harding, T. P.; Lowell, James D.

doi:10.1306/2f9184b4-16ce-11d7-8645000102c1865d

Cited by 80 publications

(11 citation statements)

References 63 publications

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“…11A-C & 12A-C). These linear features correspond well with a network of narrow, anastomosing positive aeromagnetic anomalies arranged in relay pattern (Harding & Lowell, 1979;, some of which correlate with swarms of early Carboniferous (Lippard & Prestvik, 1997) dolerite dykes (Figs. 5A, B, 11F & 12E; Nasuti et al, 2015a) intruded along and sealing (Roberts et al, 1991) WNW-ESE-to E-Wstriking faults onshore Magerøya.…”

Section: Linking Segments and Splays Of The Trollfjorden-komagelva Fault Zone And Associated Faultsmentioning

confidence: 57%

“…An additional argument to link WNW-ESE-striking faults onshore-nearshore Magerøya to the TKFZ is the linkage of multiple, narrow, WNW-ESE-trending, positive aeromagnetic anomalies on Magerøya (Figs. 5A, B & 11F), which represent Carboniferous dolerite dykes arranged in relay pattern (i.e., inconsistently overlapping or underlapping and subparallel; Harding & Lowell, 1979; and intruded along WNW-ESE-striking brittle faults (Roberts et al, 1991;Nasuti et al, 2015a), to analogous anomalies on the Varanger Peninsula (key locality of the TKFZ). These anomalies truncate NNE-SSW-to NE-SW-trending submarine escarpments (Fig.…”

Section: Wnw-ese Striking Faultsmentioning

confidence: 99%

“…This is supported by the relay pattern displayed by the dyke-related aeromagnetic anomalies (Figs. 5 & 11F), the geometry of which is typical of extensional tectonics (Harding & Lowell, 1979). By comparison, swarms of WNW-ESEstriking early Carboniferous dykes in Finnmark are similar in size (possibly km-scale width for individual swarms, and a several tens of km-wide area affected by the dykes) and shape (rectilinear dyke swarms arranged in relay pattern) to dyke swarms in active rifts, e.g., the Northern Rift Zone in Iceland (Buck et al, 2006;Hjartardóttir et al, 2016).…”

Section: Linking Segments and Splays Of The Trollfjorden-komagelva Fault Zone And Associated Faultsmentioning

confidence: 99%

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Late Devonian–Carboniferous faulting and controlling structures and fabrics in NW Finnmark

Koehl¹,

Bergh²,

Osmundsen³

et al. 2019

NJG

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In the SW Barents Sea, Devonian-Carboniferous collapse led to the formation of major basins and faults, e.g., the Hammerfest Basin bounded by the Troms-Finnmark Fault Complex, and rhomboid-to sigma-shaped (half-)grabens on the Finnmark Platform. High-resolution aeromagnetic and bathymetry data from the shallow shelf show that analogue fault systems are present in coastal and onshore areas of NW Finnmark. We provide new documentation for the Langfjorden-Vargsundet fault, a post-Caledonian, NW-dipping, zigzag-shaped, margin-parallel fault complex consisting of alternating linear to sub-linear, NNE-SSW-and ENE-WSW-striking, down-NW normal fault segments. This fault formed as an extensional splay-fault of inverted, Caledonian, brittle-ductile thrusts, e.g, the Talvik and Kvenklubben faults, which the fault eventually truncated and offset. In northern Finnmark, the Langfjorden-Vargsundet fault is offset laterally by up to 28 km by a system of WNW-ESE-trending faults notably including potential segments and splays of the Trollfjorden-Komagelva Fault Zone, a reactivated Neoproterozoic, margin-orthogonal transfer fault, separating NW Finnmark from the eastern Finnmark Platform. This fault system likely dies out westwards, and portions of the system's process zone may crop out on the island of Magerøya. Similarly, the WNW-ESE-to ENE-WSW-striking Akkarfjord fault offsets the Langfjorden-Vargsundet fault by c. 2 km left-laterally. This fault may have formed as a conjugate to the Trollfjorden-Komagelva Fault Zone in Neoproterozoic (Timanian?) times. Steeply NW-plunging, upright and gently NE-plunging, inclined folds in Archaean-Palaeoproterozoic basement rocks and margin-parallel Caledonian thrusts may have controlled the formation and geometry of post-Caledonian faults. A Late Devonian-Carboniferous age for the Langfjorden-Vargsundet fault is supported by geochronological dating of onshore dykes and fault gouge, and by syn-tectonic sedimentary wedges along the offshore extension of the Langfjorden-Vargsundet fault. Mini-basins bounded by the Langfjorden-Vargsundet fault on the Finnmark Platform and on the shallow shelf, e.g., the Ryggefjorden trough, may represent analogues to deep, offshore, Devonian-Carboniferous basins, like the Nordkapp Basin, prior to the deposition of late Palaeozoic evaporites.

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Section: Linking Segments and Splays Of The Trollfjorden-komagelva Fault Zone And Associated Faultsmentioning

confidence: 57%

Section: Wnw-ese Striking Faultsmentioning

confidence: 99%

Section: Linking Segments and Splays Of The Trollfjorden-komagelva Fault Zone And Associated Faultsmentioning

confidence: 99%

See 1 more Smart Citation

Late Devonian–Carboniferous faulting and controlling structures and fabrics in NW Finnmark

Koehl¹,

Bergh²,

Osmundsen³

et al. 2019

NJG

View full text Add to dashboard Cite

show abstract

“…Applying structural deformation models (e.g., Crowell, 1982;Harding & Lowell, 1979;Wilcox et al, 1973) indicate that the compression at the Buga Salient may indicate future surficial ruptures transverse to the Central Cordillera, probably associated with the ENE right-lateral strike-slip Ibagué Fault (Montes et al, 2005a). This observation would be consistent with that of Corredor (2003), who argued that this fault is a regional transfer zone.…”

Section: Discussionmentioning

confidence: 99%

Chapter 1

SGC¹

2019

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The Cauca River valley is a Cenozoic intermountain basin with a tectonic history characterized by the alternation between compressional and extensional phases. Here, two new radiometric ages of La Paila Formation (10.5 ± 0.4 Ma and 4.4 ± 0.07 Ma Ar/Ar in amphibole) are used as a reference to deduce the tectonic events that occurred in the Miocene -Quaternary interval. The Miocene -Pliocene La Paila Formation is a continental unit deposited during an initial extensional phase under the influence of arc volcanism and a compressional final stage. The overlying units, i.e., the Pleistocene Zarzal Formation and Quaternary deposits, record the compressive tectonic activity that started after the formation of the Panamá Isthmus. The current deformation is registered in the Buga Salient by a series of west-vergent thrust faults that are narrowing the present Cauca River valley. This salient is proposed as the western termination of the Ibagué Fault. The most recent manifestations of this deformation are the folds on Quaternary alluvial fans, which involve Holocene paleosols, and the liquefaction of the deposits of the Zarzal Formation, which affects the overlying Quaternary deposits. On the Western Cordillera, a predominantly transcurrent tectonic style characterizes the recent deformation. It is proposed that the structure of the most recent deformation has occurred due to the indentation of a shallow continental wedge that has been introduced below the Cretaceous basement of the valley.

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“…at z = 2.865 km, high-amplitude features are visible close to the diapir flanks, in which a noticeable faulted structure is present. Such image features are potentially associated with hydrocarbon prospects (Harding and Lowell, 1979;Tiapkina et al, 2008).…”

Section: Field-data Examplementioning

confidence: 99%

True-amplitude migration through regularized extended linearized waveform inversion

2021

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The ability to create subsurface images whose amplitudes are proportional to the elastic wavefield variations recorded within seismic data as a function of reflection angle is fundamental for performing accurate amplitude-versus-offset (AVO) analysis and inversion. A process that generates such images is commonly referred to as true-amplitude migration. We demonstrate how the extended subsurface-offset image space is able to preserve the elastic behavior of the primary reflections when these events are acoustically migrated with a reverse-time-migration (RTM) approach performed in a least-squares fashion. Using a single-interface model, we show how the angle-domain image amplitude variations from an extended-offset acoustically migrated image closely follow the theoretical elastic Zoeppritz response even at the critical angle. Furthermore, we present a subsalt synthetic test in which single-component ocean-bottom-node (OBN) data are employed within a regularized linearized waveform inversion procedure. In this test, we highlight the ability of the acoustic extended-angle image domain to preserve the correct elastic amplitude variations of the reflected events from three subsalt sand lenses. The proposed method allows the accurate inversion of elastic-wave data for subsurface parameter variations that are critical for reservoir characterization in oil and gas exploration and production. We demonstrate its performance on an ocean-bottom-node (OBN) field dataset recorded in the Gulf of Mexico in which the AVO response of a potential gas-bearing prospect is correctly retrieved.

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Structural Styles, Their Plate-Tectonic Habitats, and Hydrocarbon Traps in Petroleum Provinces

Cited by 80 publications

References 63 publications

Late Devonian–Carboniferous faulting and controlling structures and fabrics in NW Finnmark

Late Devonian–Carboniferous faulting and controlling structures and fabrics in NW Finnmark

Chapter 1

True-amplitude migration through regularized extended linearized waveform inversion

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