Sedimentary Characteristics and Controlling Factors of Hyperpycnal Flow in Triassic Depressed Lake Basin, Northern Tarim Basin

Abstract

Abstract: Previous studies on hyperpycnal flow mainly focused on modern marine environment and paid little attention to sedimentary characteristics and controlling factors of hyperpyenal flow in ancient continental depressed lake basins. In this paper, taking Tabei area as an example, the hyperpycnal flow deposits of the Triassic TII oil member are analyzed by using core, drilling, logging and 3D seismic data. The results show that during the deposition of lacustrine transgressive system tract (TST)-highstand systems tract (HST), the TII oil member in the study area developed two typical hyperpycnal flow sedimentary sequences, and each sequence is a compound of a basal coarsening-upward unit and a top fining-upward unit, with climbing ripples and ripple cross lamination. In one sequence, an erosive surface is developed between the two units, while in the other sequence, the two sedimentary units present a trend of gradual change, reflecting different flooding energy. The hyperpycnal flow in the study area mainly comes from two directions such as southwest and northeast, among which the hyperpycnal flow from southwest is the dominant with wide distribution, long extending distance and vertical superimposition of hyperpycnal flow deposits of multiple periods. The hyperpycnal flow in the study area has the characteristics of flood gravity flow, and its formation is closely related to flooding and controlled by multiple factors such as climate, tectonic activities, lake level, and provenance.

Key words: Tarim basin, Tabei area, Triassic, hyperpyenal flow, hyperpycnite, flooding, controlling factor, depositional model

ZHONG Mihong, TANG Wu. Sedimentary Characteristics and Controlling Factors of Hyperpycnal Flow in Triassic Depressed Lake Basin, Northern Tarim Basin[J]. Xinjiang Petroleum Geology, 2023, 44(zk(English)): 14-21.

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