Genetic Stratigraphic Sequences in Basin Analysis II: Application to Northwest Gulf of Mexico Cenozoic Basin

Galloway, William E.

doi:10.1306/703c9afa-1707-11d7-8645000102c1865d

Cited by 52 publications

(11 citation statements)

References 23 publications

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“…Only a few deep (about 6000 m) wells penetrate the entire Lower Wilcox section in the southern part of the study area. Spontaneous potential (SP) log curves were used for subsurface correlation, achieved using the genetic sequence approach of Galloway (1989). Lithologies such as sandstone and shale were interpreted from SP log patterns through log normalization and cutoff values.…”

Section: Methodsmentioning

confidence: 99%

Depositional Processes at the Lower Wilcox Shelf–Slope Transition Zone

Olariu,

Zeng

2013

GCAGS Journal

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Recognition of sand bypass at the shelf margin is key to deep-water exploration. This study examines the shelf margin architecture of the Lower Wilcox Group in Texas by combining wireline log with 3D seismic data. During the early Paleocene a relatively extensive (50 km wide), shallow-shelf platform extended across Central Texas making it difficult for the deltas to reach the shelf edge. The seaward pinchout of Lower Wilcox sandstone-rich shoreface deposits is about 20 km updip from the contemporaneous shelf edge indicating that sand remained on the inner and middle shelf and that the shelf margin grew through mud accretion. Highstand sea-level conditions favored the generation of hyperpycnal flows that incised into shelf deposits, with sand bypassed onto upper and middle slopes. In areas of shale withdrawal, extensional features such as growth faults produced long, linear to arcuate strike-elongate depocenters within hanging-walls of faults and dictated sediment delivery pathways. Our work suggests that significant volumes of deep-water sands were deposited from hyperpycnal flows initiated by direct river effluents that accumulated on the upper slope. High-density hyperpycnal flows created sand-filled slope-channel complexes 10–20 m thick and 200 m to more than 1 km wide that served as conduits for bypass to the basin floor. Unconfined, low-density hyperpycnal flows deposited lobes on the upper slope. Lobes spread 10–20 km laterally and 2–4 km downdip, with a maximum total sand thickness of 100 m. A high net-to-gross ratio (0.6) suggests the sand-rich component of the flow was deposited on the upper slope, while finer-grained sediment continued downslope. The shelf-margin architecture exhibited by this sequence serves as an example of hyperpycnal flows being the main initiator of turbidity currents for sand accumulation on the slope.

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Section: Methodsmentioning

confidence: 99%

Depositional Processes at the Lower Wilcox Shelf–Slope Transition Zone

Olariu,

Zeng

2013

GCAGS Journal

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“…In the Eastern Barents Sea, the Upper Jurassic-Lower Cretaceous succession consists of 2 second-order sequences and 7 third-order sequences (Galloway, 1989;Nystuen, 1998). The second-order sequences are divided into: (1) the Upper Jurassic-Barremian, and (2) the Barremian-Cenomanian.…”

Section: Seismic-stratigraphic Sequencesmentioning

confidence: 99%

Sequence stratigraphy and palaeogeography of the Upper Jurassic and Lower Cretaceous in the Eastern Barents Sea

Mordasova,

Stoupakova,

Suslova

et al. 2024

Basin Research

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The Upper Jurassic–Lower Cretaceous sedimentary rocks in the Eastern Barents Sea Basin are up to 2 km thick and represent one of the least studied Arctic intervals. Here, for the first time, we present a detailed analysis of 43,000 km of 2D seismic profiles, as well as well‐log and core data from 24 offshore wells with the aim to create a comprehensive sequence stratigraphic framework that can be integrated with the rest of the basin. Results show that (1) seven third‐order sequences and five types of clinoforms can be identified based on integrated seismic and well data. The age of each sequence was established based on published biostratigraphic investigations along with new dinocyst interpretations included in this study; (2) the deep marine basin was gradually filled with sediments coming from north, east and south as a response to HALIP, Canada Basin opening and Cimmerian uplift of Novaya Zemlya, and was preserved only in the south‐western part of the Barents Sea Basin at the end of Early Cretaceous and (3) both Eastern Barents Sea and West Siberia Basin share similarities in sedimentary environments and tectonic setting, though the spatial distribution of clastic reservoirs in Upper Jurassic and Lower Cretaceous mega‐sequence heavily depends on the source areas that require more provenance focused research. The results presented here can be used in further regional exploration in the area and to better understand the geodynamic evolution of the Greater Barents Sea Basin.

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“…At the largest spatial and temporal scales, vertical movements are initiated during the initial rifting phase by stretching and thinning of the lithosphere (e.g., Mackenzie, 1978;Galloway, 1989). Thermal cooling and contraction of upwelled asthenosphere then causes the margin to subside during the post-rift phase.…”

Section: Components Of Vertical Motion In Passive Margin Deltaic Depo...mentioning

confidence: 99%

The flexural isostatic response of climatically driven sea-level changes on continental-scale deltas

Morón¹,

Blum²,

Salles³

et al. 2023

Preprint

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Abstract. The interplay between climate-forced sea-level change, sediment erosion and deposition, and flexural adjustments in deep time on passive margin deltas remains poorly understood. We performed a series of conceptual simulations to investigate flexural isostatic responses to high-frequency fluctuations in water and sediment load associated with climatically driven sea-level changes. We model a large drainage basin that discharges to a continental margin to generate a deltaic depocenter, then prescribe synthetic and climatic-driven sea-level curves of different frequencies to assess flexural response. Results show that flexural isostatic adjustments are bidirectional over 100–1000 kyr timescales and are in sync with the magnitude, frequency, and direction of sea-level fluctuations, and that isostatic adjustments play an important role in driving along-strike and cross-shelf river-mouth migration and sediment accumulation. Our findings demonstrate that climate-forced sea-level changes produce a feedback mechanism that results in self-sustaining creation of accommodation into which sediment is deposited and plays a major role in delta morphology and stratigraphic architecture.

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Genetic Stratigraphic Sequences in Basin Analysis II: Application to Northwest Gulf of Mexico Cenozoic Basin

Cited by 52 publications

References 23 publications

Depositional Processes at the Lower Wilcox Shelf–Slope Transition Zone

Depositional Processes at the Lower Wilcox Shelf–Slope Transition Zone

Sequence stratigraphy and palaeogeography of the Upper Jurassic and Lower Cretaceous in the Eastern Barents Sea

The flexural isostatic response of climatically driven sea-level changes on continental-scale deltas

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