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Sedimentology and sequence stratigraphy of a retrogradational fan-delta system within Lower Triassic in the Mabei area, Junggar Basin (northwestern China)

B. Peng, Z. Jin, J. Wang, H. Jia, X. Zhu, T. Chang and K. Yuan
Sedimentology and sequence stratigraphy of a retrogradational fan-delta system within Lower Triassic in the Mabei area, Junggar Basin (northwestern China)
Russian Geology and Geophysics (June 2018) 59 (6): 606-619

Abstract

The sedimentology and sequence stratigraphy of a retrogradational fan-delta system within Lower Triassic in the Mabei area of Junggar Basin in northwestern China were investigated using seismic, well log, and core data, complemented by the modern deposition and a flume tank experiment. The Lower Triassic in the Mabei area is dominated by fan deltas, which are composed of fan-delta plain (including subaerial debris flow, braided channel, conglomerate overbank, and floodplain), fan-delta front (including conglomerate shoal and sandy shoal), and prodelta. The braided channels form during the low flood period. The conglomerate overbanks form during the flood period and occupy most part of the fan-delta plain. The conglomerate shoals and sandy shoals form by a sheet flow prograding into lakes and occur as a sheet. The braided channels, conglomerate shoals, and sandy shoals are easy to form high-porosity reservoirs. One long-term base level cycles (LSC1), three middle-term base level cycles (MSC1, MSC2, and MSC3), and fifteen short-term base level cycles are identified. MSC1 is dominated by the fan-delta plain; MSC2 is dominated by the fan-delta front; and MSC3 is dominated by the fan-delta front and prodelta. The stratigraphy shows a proximal-middle-distal trend demonstrating an overall retrogradation stacking pattern. The sequence architecture is controlled by an interplay between lake level changes and sediment supply. The quick rise in the lake level and the creation of accommodation outpacing the rate of sediment supply result in a retrogradational fan-delta syste.


ISSN: 1068-7971
Serial Title: Russian Geology and Geophysics
Serial Volume: 59
Serial Issue: 6
Title: Sedimentology and sequence stratigraphy of a retrogradational fan-delta system within Lower Triassic in the Mabei area, Junggar Basin (northwestern China)
Affiliation: Laboratory of Petroleum Resource and Prospecting, Beijing, China
Pages: 606-619
Published: 201806
Text Language: English
Publisher: Allerton Press, New York, NY, United States
References: 46
Accession Number: 2022-003778
Categories: Economic geology, geology of energy sourcesStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., geol. sketch maps
N44°00'00" - N48°00'00", E82°00'00" - E93°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2022
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