Mud-coated intraclasts: A criterion for recognizing sandy mass-transport deposits – Deep-lacustrine massive sandstone of the Upper Triassic Yanchang Formation, Ordos Basin, Central China

Li, Xiangbo; Yang, Zhibin; Wang, Jing; Liu, Huaqing; Chen, Qilin; Wu, Rong; Liao, Jianbo; Li, Zhiyong

doi:10.1016/j.jseaes.2016.06.007

Cited by 37 publications

(16 citation statements)

References 27 publications

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“…The planar fabric of the clasts further supports the hypothesis that the sediment was transported by plastic flows (Talling et al 2012a;Yang et al 2014). The presence of mudstone coats can be attributed to muddy slurry adhering to the clasts as they were rolled or spun by the shear stresses along their upper and lower surfaces (Li et al 2014(Li et al , 2016. These features also indicate that the deposits did not result from a turbidity current (with water between grains).…”

Section: Facies Bsupporting

confidence: 54%

Origin and depositional model of deep-water lacustrine sandstone deposits in the 7th and 6th members of the Yanchang Formation (Late Triassic), Binchang area, Ordos Basin, China

et al. 2017

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Sandstones attributed to different lacustrine sediment gravity flows are present in the 7th and 6th members of the Yanchang Formation in the Ordos Basin, China. These differences in their origins led to different sandstone distributions which control the scale and connectivity of oil and gas reservoirs. Numerous cores and outcrops were analysed to understand the origins of these sandstones. The main origin of these sandstones was analysed by statistical methods, and well logging data were used to study their vertical and horizontal distributions. Results show that the sandstones in the study area accumulated via sandy debris flows, turbidity currents and slumping, and sandy debris flows predominate. The sandstone associated with a single event is characteristically small in scale and exhibits poor lateral continuity. However, as a result of multiple events that stacked gravity flow-related sandstones atop one another, sandstones are extensive overall, as illustrated in the cross section and isopach maps. Finally, a depositional model was developed in which sandy debris flows predominated and various other types of small-scale gravity flows occurred frequently, resulting in extensive deposition of sand bodies across a large area.

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Section: Facies Bsupporting

confidence: 54%

Origin and depositional model of deep-water lacustrine sandstone deposits in the 7th and 6th members of the Yanchang Formation (Late Triassic), Binchang area, Ordos Basin, China

et al. 2017

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“…5b). Mud clasts (up to 50 cm in diameter) are developed, especially within the basal part of massive sandstones ("mudcoated intraclast" as in Li et al 2016), suggesting gravity flow deposition. Within the massive sandstones, amalgamation surfaces are widely developed based on the observation that shale layers with stable thickness pinch out abruptly (Fig.…”

Section: Thickening-upward Cycles In Deep-lacustrine Environmentmentioning

confidence: 99%

“…For the Ordos Basin, many sedimentologists are inclined to the interpretation of sandy debrites, mainly based on the widespread thick structureless massive sandstones with floating mud fabrics ("mud-coated intraclasts") and an absence of channels (e.g. Zou et al 2012;Li et al 2016), whereas researchers have not paid equal attention to deep-lacustrine channels within the Yanchang Formation. However, deep-lacustrine channels are developed in the Yanchang Formation, as in the Yangmahe and Yaoqu outcrops discussed herein, and elsewhere within the Ordos Basin (e.g.…”

Section: Comparison To Other Deep-lacustrine Depositional Modelsmentioning

confidence: 99%

“…Chen and Hiscott 1999). Furthermore, studies on TUCs in deeplacustrine gravity deposition are scarce, consequently, the complex interplay of sandy debris flows, hyperpycnal flows and turbidity flows in deep-lacustrine environment requires further work (Zou et al 2012;Li et al 2016;Shanmugam 2016;Yang et al 2017). Therefore, the objectives of this study are to (1) explore the occurrence of TUC in deep-marine and deep-lacustrine deposition; (2) compare the TUC formed in deep-marine and deeplacustrine deposition; (3) investigate the origin of TUC in deepwater environment; and, (4) discuss the depositional mechanism of deep-lacustrine gravity flows.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thickening-upward cycles in deep-marine and deep-lacustrine turbidite lobes: examples from the Clare Basin and the Ordos Basin

Zhang

Dong

2020

J. Palaeogeogr.

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Deep-marine and deep-lacustrine reservoirs have been targets for conventional and unconventional oil and gas exploration and development for decades. Thickening-upward cycles in the deep-marine Carboniferous Ross Sandstone Formation outcrops in western Ireland and the deep-lacustrine Triassic Yanchang Formation outcrops in southeast Ordos Basin have been investigated and correlated in this study. Typical thickening-upward cycles consisting of, from bottom to top: (1) laminated shales/shales with interbedded siltstone beds; (2) interbedded sandstones/siltstones and mudstones; (3) structureless massive sandstones, are well recognized in these outcrops and are interpreted as turbidite lobes. A continuously prograding lobe-element model is proposed to explain the repeated stacking of thickening-upward cycles. Thickening-upward cycles developed within deep-marine and deeplacustrine environments are highly comparable in many aspects, such as sedimentary structures, sheet-like geometries and amalgamation features. A frequent and strong degree of amalgamation is developed within the massive sandstone at the top of each thickening-upward cycle, suggesting a layer-by-layer depositional manner. Field observations and comparison with deep-marine counterparts support the occurrence of turbidity flows in the Yanchang Formation, Ordos Basin.

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“…From top to bottom, the Chang 10 to Chang 8 members represent the early development stages of the basin; the Chang 7 represents the expansion stage; the Chang 6 represents the filling stage of the large-scale delta; the Chang 4 and 5 represent the short small-scale lake expansion, and Chang 3 to 1 represent filling of the lake basin (He 2003;Yu et al 2001;Lin et al 2008). A large deltaic depositional system formed in the lake basin during the Chang 7 to Chang 6 3 stage, forming many moderately deep to deep lake deposits along the basin center at Wuqi-FuxianHuangling-Heshui-Huanxian-Dingbian (Li et al 2016;Zou et al 2012; Fig. 1).…”

Section: Geologic Settingmentioning

confidence: 99%

Microscopic characterization and formation mechanisms of deep-water sandy-debris-flow and turbidity-current sandstones in a lacustrine basin: a case study in the Yanchang Formation of the Ordos Basin, China

Liao

et al. 2018

Pet. Sci.

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Deep-water deposition is a current issue in sedimentological research. Sandy-debris-flow sandstones and turbidity-current sandstones are the main types of sandstone that are the focus of considerable disputes in this research. Previous studies mainly focused on description of the macroscopic sedimentary structure and theoretical derivation of the formation mechanisms. The microscopic petrological characteristics, reservoir properties, and formation mechanisms of deep-water sandy-debris-flow and turbidity-current sandstones have been studied in the Yanchang Formation of the Ordos Basin, China, by means of field outcrop surveys, thin-section identification, geochemical element analysis, and porosity and permeability measurements under overburden pressure. The content of detrital grains in the sandy-debris-flow sandstones is high, whereas the contents of mica sheets and matrix are low. The fine-grained matrix is distributed unevenly within the pores. A considerable number of residual intergranular pores are preserved in the middle of single sand bodies, resulting in relatively better reservoir properties. The total number of detrital grains in the turbidite sandstone is low, while it contains abundant mica sheets and matrix. The mica sheets and fine-grained matrix are distributed evenly within the pores, resulting in serious damage to pores and poor reservoir properties. The sandy-debris-flow sandstones in the center of the lake basin form a high-quality reservoir; thus, this area is suitable for oil and gas exploration.

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Mud-coated intraclasts: A criterion for recognizing sandy mass-transport deposits – Deep-lacustrine massive sandstone of the Upper Triassic Yanchang Formation, Ordos Basin, Central China

Cited by 37 publications

References 27 publications

Origin and depositional model of deep-water lacustrine sandstone deposits in the 7th and 6th members of the Yanchang Formation (Late Triassic), Binchang area, Ordos Basin, China

Origin and depositional model of deep-water lacustrine sandstone deposits in the 7th and 6th members of the Yanchang Formation (Late Triassic), Binchang area, Ordos Basin, China

Thickening-upward cycles in deep-marine and deep-lacustrine turbidite lobes: examples from the Clare Basin and the Ordos Basin

Microscopic characterization and formation mechanisms of deep-water sandy-debris-flow and turbidity-current sandstones in a lacustrine basin: a case study in the Yanchang Formation of the Ordos Basin, China

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