Wheeler-transformed 2D seismic data yield fan chronostratigraphy of offshore Tanzania

McDonough, Katie-Joe; Bouanga, Eric; Pierard, Claire; Horn, Brian W.; Emmet, Pete; Gross, Jon; Danforth, Al; Sterne, Ned; Granath, Jim

doi:10.1190/tle32020162.1

Cited by 7 publications

(4 citation statements)

References 10 publications

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“…The chronology of the Davie Ridge, summarized in Figure , was estimated using biostratigraphic information from eight explorations wells, sediment samples and correlations with published data (Coffin & Rabinowitz, ; Franke et al, ; Klimke & Franke, ; McDonough et al, ; Mougenot et al, ; O’Sullivan, ; Sansom, ; Scrutton, ; Sii & Underhill, ). Taking into account the vertical resolution of the seismic data, sediments in proximity of Horizon H1 (Figure ) are dated by the Last Occurrence of Sphenolithus delphix (top Chattian, ~23.1 Ma; Raffi et al, ) and correlates with the base of Ng1 sequence of Sansom (), with the top Oligocene reflector (O) of Franke et al (), and with horizon A 1 of Mougenot et al ().…”

Section: Resultsmentioning

confidence: 99%

Impact of the East African Rift System on the routing of the deep‐water drainage network offshore Tanzania, western Indian Ocean

et al. 2019

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The East African Rift System (EARS) exerted a major influence on river drainage basins and regional climate of east Africa during the Cenozoic. Recent studies have highlighted an offshore branch of the EARS in the western Indian Ocean, where the Kerimbas Graben and the Davie Ridge represent its sea floor expression. To date, a clear picture of the impact and timing of this EARS offshore branch on the continental margin of the western Indian Ocean, and associated sediment dispersal pathways, is still missing. This study presents new evidence for four giant canyons along the northern portion of the Davie Ridge offshore Tanzania. Seismic and multibeam bathymetric data highlight that the southernmost three canyons are now inactive, supra-elevated relative to the adjacent sea floor of the Kerimbas Graben and disconnected from the modern slope systems offshore the Rovuma and Rufiji River deltas. Regional correlation of dated seismic horizons, integrated with well data and sediment samples, proves that the tectonic activity driving the uplift of the Davie Ridge in this area has started during the middle-upper Miocene and is still ongoing, as suggested by the presence of fault escarpments at the sea floor and by the location and magnitude of recent earthquakes. Our findings contribute to placing the Kerimbas Graben and the Davie Ridge offshore Tanzania in the regional geodynamic context of the western Indian Ocean and show how the tectonics of the offshore branch of the EARS modified the physiography of the margin, rerouting the deep-water drainage network since the middle Miocene. Future studies are needed to understand the influence of changing sea floor topography on the western Indian Ocean circulation and to evaluate the potential of the EARS offshore tectonics in generating tsunamigenic events.

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Section: Resultsmentioning

confidence: 99%

Impact of the East African Rift System on the routing of the deep‐water drainage network offshore Tanzania, western Indian Ocean

et al. 2019

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“…The integration of the sequence stratigraphy methodology with fault interpretation made it possible to distinguish structural units characterized by a different tectonic style corresponding to megasequences. The term "megasequence" is understood as tectonostratigraphic complex of sediments deposited during the crucial phases of the sedimentary basin development [60,62,63]. Tectonostratigraphic units can correspond to regional events such as contractional and extensional phases of basin development [59,64,65].…”

Section: Tectonostratigraphymentioning

confidence: 99%

Seismostratigraphic Interpretation of Upper Cretaceous Reservoir from the Carpathian Foreland, Southern Poland

et al. 2021

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The Upper Cretaceous complex in the central part of the Carpathian Foreland (southern Poland) is relatively poorly recognized and described. Its formations can be classified as unconventional reservoir due to poor reservoir properties as well as a low recovery factor. The main aim of the article is to expand knowledge with conclusions resulting from the analysis of the latest seismic data with the application of seismic sequence stratigraphy. Moreover, the seismic attributes analysis was utilized. The depositional architecture recognition based on both chronostratigraphic horizons and Wheeler diagram interpretations was of paramount importance. A further result was the possibility of using the chronostratigraphic image for tectonostratigraphic interpretation. Two distinguished tectonostratigraphic units corresponding to megasequences were recognized. A tectonic setting of the analyzed interval is associated with global processes noticed by other authors in other parts of the central European Late Cretaceous basin, but also locally accompanied by evidence of small-scale tectonics. This study fills the gap on the issue of paleogeography in the Late Cretaceous sedimentary basin of the Carpathian Foreland. It presents the first results of detailed reconstruction of the basin paleogeography and an attempt to determine the impact of both eustatic and tectonic factors on sedimentation processes.

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“…Different possibilities of the offshore source of sediments have been suggested and one possibility has been explained by McDonough et al [28] as originated from Rufiji and Ruvuma deltas and transported by down slope turbidite current as in Block 2 about 80 km from the margin. Another possibility is that the offshore sediments could have derived from the coast parallel surface currents [29].…”

Section: Geological Setting Of the Offshore Tanzaniamentioning

confidence: 99%

Tectono-Sedimentary Evolution of the Offshore Hydrocarbon Exploration Block 5, East Africa: Implication for Hydrocarbon Generation and Migration

Seni¹,

Mulibo²,

Bertotti³

2018

OJG

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Sedimentary deposits in Block 5, offshore Tanzania basin have been imaged using two-dimensional (2D) seismic data. The seismic data and well data reveal four tectonic units representing different tectonic events in relation to structural styles, sedimentation and hydrocarbon potential evolved in Block 5. Results show that during Early to Late Jurassic, Block 5 was affected by the break-up of Gondwana and the drifting of Madagascar as evidenced by patterns of sediments and structural features. The chaotic and discontinuous reflectors are characteristics features on the sediments pattern indicating a possible transitional setting following the breakup of Gondwana. From the Late Cretaceous, Block 5 sits in more stable subsiding sag as the consequence of the high thermal subsidence. The period displayed continuous parallel reflectors with few markable faults. This was followed by the late post rift sedimentation that occurred after Middle Eocene Unconformity characterized by high wavy and sub parallel reflectors. The evolution of Block 5 through major tectonic events reveals a more complete petroleum system towards the south. Thus, Block 5 responded in both space and time to a complex interplay between tectonics and sedimentation. This indicates that structural styles and associated features are potential control for hydrocarbon generation and migration.

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Wheeler-transformed 2D seismic data yield fan chronostratigraphy of offshore Tanzania

Cited by 7 publications

References 10 publications

Impact of the East African Rift System on the routing of the deep‐water drainage network offshore Tanzania, western Indian Ocean

Impact of the East African Rift System on the routing of the deep‐water drainage network offshore Tanzania, western Indian Ocean

Seismostratigraphic Interpretation of Upper Cretaceous Reservoir from the Carpathian Foreland, Southern Poland

Tectono-Sedimentary Evolution of the Offshore Hydrocarbon Exploration Block 5, East Africa: Implication for Hydrocarbon Generation and Migration

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