Geology, sequence stratigraphy, and oil and gas assessment of the Lewis Shale Total Petroleum System, San Juan Basin, New Mexico and Colorado: Chapter 5 in &lt;i&gt;Total petroleum systems and geologic assessment of undiscovered oil and gas resources in the San Juan Basin Province, exclusive of Paleozoic rocks, New Mexico and Colorado&lt;/i&gt;

Dubiel, Russell F.

doi:10.3133/ds69f5

Cited by 8 publications

(1 citation statement)

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“…Lithostratigraphic chart of the Gallup and Crevasse Canyon formations of the San Juan Basin, NM (modified after Nummedal & Molenaar, ; Dubiel, ; Fassett, ).…”

Section: Geological Settingmentioning

confidence: 99%

Depositional facies and the sequence stratigraphic control of a mixed‐process influenced clastic wedge in the Cretaceous Western Interior Seaway: The Gallup System, New Mexico, USA

Lin

Bhattacharya

2019

Sedimentology

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Depositional facies have been hypothesized to be linked to sequence stratigraphic positions. Also, shoreline systems are built by mixed processes, including rivers, storms, fair-weather waves and tides. Resolving the complexity of shoreline deposition requires detailed quantitative facies analysis with particular attention to heterolithic successions. In this study, 71 sections in a 130 km long outcrop belt of the Cretaceous Gallup Formation in the north-west of the San Juan Basin were measured. Five major facies associations were identified using sedimentological and iconological interpretations, including offshore shelf, non-deltaic shoreline sandstones, deltas, coastal bayline and fluvial. Each facies association also comprises subordinate facies. Depositional facies interpretations are placed in a high-resolution sequence stratigraphic framework that allows for reconstructions of the palaeogeography of individual parasequence sets that demonstrate temporal and spatial evolution of facies associations and depositional processes. The results show that the Gallup is a mixed-process-controlled depositional system with fair-weather and storm-wave dominance, river influence and tideeffect, contrasting with previous interpretations of a solely fair-weather wave-dominated environment. Depositional processes and the resultant facies change with sequence stratigraphic positions in response to relative sea-level changesparticular facies are only deposited in certain systems tracts. Distinction and transition between non-deltaic shorefaces and wavedominated deltas have also been documented in this study. Non-deltaic shorefaces are characterized by homogeneous sandstones with a wide-range bioturbation index and the absence of mudstones. Wave-dominated deltas are subject to river influence and contain prodelta facies. This study shows the importance of detailed facies analysis with high-resolution sequence stratigraphic control using outcrops for documenting sedimentary processes of shallow marine shoreline systems.

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“…Lithostratigraphic chart of the Gallup and Crevasse Canyon formations of the San Juan Basin, NM (modified after Nummedal & Molenaar, ; Dubiel, ; Fassett, ).…”

Section: Geological Settingmentioning

confidence: 99%