New insights into deep-lacustrine architectural elements: Examples from the upper Triassic Yanchang Formation, Ordos basin

Bozetti，Guilherme1; Li，Xiangbo2; Yang，Zhanlong2; Liu，Huaqing2; Huang，Junping2; Li，Zhiyong2; Xu，Jingping1

2023

10.1016/j.jseaes.2022.105431

JOURNAL OF ASIAN EARTH SCIENCES   Impact Factor & Quartile

1367-9120

1878-5786

Deep-lacustrine systems are considerably less studied than their marine counterparts, mostly due to the low number of large and continuous outcrops worldwide. This study details outcrops and cores from Chang 7, Ordos Basin, China, which are composed dominantly of fine-grained deposits interbedded with amalgamated sandstones. Thick sandstone deposits, previously described as massive sandstones and interpreted as sandy debrites, are here re-interpreted as amalgamated sandstones, deposited by high-density turbidity currents associated with deep-lacustrine slope channels. Two outcrops composed of these deposits, which form intervals ranging from 6 to 20 m thick, laterally ranging from 600 to 1200 m, preserving evidence of sediment bypass such as erosional features and abundant trough cross-bedding, have been interpreted as lacustrine slope channels. Deposits composed dominantly of interbedded thin-bedded normal-graded sandstone and mudstone, with common occurrences of ripple cross-lamination (>70 % of the beds), interbedded with sporadic amalgamated medium-bedded sandstones have been interpreted as levee deposits. These deposits outcrop laterally to slope channel deposits, supporting the interpretation they are genetically and architecturally related. Similar deposits are also described in core, overlying channelised sand-prone deposits. Interbedded thin- to medium-bedded normal-graded sandstones and mudstones, which are not associated with a confining surface (non-channelised), nor an adjacent slope channel, have been interpreted as terminal splays. The re-interpretation of the sandstone-prone deposits of the Yanchang Formation as slope channel-levees to terminal splays provides a different approach to lateral and temporal distribution of architectural elements in intracratonic lacustrine basins, and therefore hydrocarbon exploration and production.

Deep-lacustrine environment Ordos Basin Sediment bypass Slope channel-levee Turbidity currents Yanchang Formation

SCI

English

First ; Corresponding

National Science Foundation of China (NSFC)["41772099","41720104001"]

Geology

Geosciences, Multidisciplinary

WOS:000882127000001

PERGAMON-ELSEVIER SCIENCE LTD

GEOSCIENCES

2-s2.0-85141232510

Scopus

1.Department of Ocean Sciences and Engineering,Southern University of Science and Technology,Shenzhen,No. 1088 Xueyuan Road, Nanshan District, Guangdong,518055,China
2.PetroChina Research Institute of Petroleum Exploration & Development – Northwest,Lanzhou,730020,China

Bozetti，Guilherme,Li，Xiangbo,Yang，Zhanlong,et al. New insights into deep-lacustrine architectural elements: Examples from the upper Triassic Yanchang Formation, Ordos basin[J]. JOURNAL OF ASIAN EARTH SCIENCES,2023,241.

Bozetti，Guilherme.,Li，Xiangbo.,Yang，Zhanlong.,Liu，Huaqing.,Huang，Junping.,...&Xu，Jingping.(2023).New insights into deep-lacustrine architectural elements: Examples from the upper Triassic Yanchang Formation, Ordos basin.JOURNAL OF ASIAN EARTH SCIENCES,241.

Bozetti，Guilherme,et al."New insights into deep-lacustrine architectural elements: Examples from the upper Triassic Yanchang Formation, Ordos basin".JOURNAL OF ASIAN EARTH SCIENCES 241(2023).