Provenance analysis of the Middle Triassic Ordos Basin: Constraints from zircon U-Pb geochronology

Meng, Xianwei; Duo-yun, Wang

doi:10.1016/j.chemer.2019.07.003

Cited by 10 publications

(8 citation statements)

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“…Therefore, the geochemical index reveals a transitional environment of weak reduction-strong oxidation in the Chang 8 period. 34,35,72,73 Based on a large number of data that was obtained from drilling samples, isochronous division of layers, and sedimentary microfacies analysis, the plane distribution of beach bar sand bodies in different periods of the Chang 8 2 submember was determined. In the early stages of the Chang 8 2 deposition, the water body was limited, and the shoreline was mainly distributed in the Huachi area.…”

Section: Planar Distribution Characteristics Of Beach Bar Sand Bodiesmentioning

confidence: 99%

Sedimentary characteristics, formation conditions, and distribution mechanisms of beach bar sand bodies of Chang 8₂ submember, southwest Ordos Basin

Liao,

Xiao,

Long

et al. 2024

Energy Science & Engineering

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Beach bar sand bodies are a relatively new type of reservoir in oil exploration where they can be found in the proximity of the source rock. In this study, the genetic type of sand bodies in the Upper Triassic Yanchang Formation in the southwest Ordos Basin is systematically studied through the observation of outcrops, core description, microscopic inspection of thin sections, along with petrophysical properties, mineralogy, and geochemical analysis of trace elements. The results showed that a new sedimentary type of beach bar sand bodies are developed in the Chang 82 submember of the Yanchang Formation, that are generally characterized with a flat bottom and convex top, where the contact interface between the bottom of the single sand body and mudstone is flat, and the bottom lacks erosion and filling structure. Moreover, a variety of wave‐induced sedimentary structures are developed, showing a reverse sedimentary sequence from fine to coarse grains. The structural and compositional maturity of the beach bar sand bodies are higher than that of the river channel sand body. Moreover, reservoir pore type is mainly comprised of intergranular pores, and the porosity and permeability of the samples retrieved from the sand body are much higher than that of the river channel sand body. Finally, the main controlling factors of the formation and preservation of beach bar sands are found to be the lake basin bottom topography, the base level cycle, and the stable paleo‐lake shoreline. During the Chang 82 submember depositional period, a large area where the beach bar sand bodies were deposited parallel to the lake shoreline in the southwest of the basin was created. Such depositional environments had suitable conditions to host large‐scale oil‐bearing reservoirs, as major exploration and development targets in the Ordos Basin in the future.

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Section: Planar Distribution Characteristics Of Beach Bar Sand Bodiesmentioning

confidence: 99%

Sedimentary characteristics, formation conditions, and distribution mechanisms of beach bar sand bodies of Chang 8₂ submember, southwest Ordos Basin

Liao,

Xiao,

Long

et al. 2024

Energy Science & Engineering

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“…The Huaqing area is located southwest of the Yishan slope (Figure 1). The total exploration area is approximately 3000 km 2 , and many nose‐shaped bulges have developed (Chu et al, 2019; Fu, Li, Xu, Guo, Li, Zhang, Song, & Sun, 2021a; Fu, Li, Xu, Guo, Li, Zhang, & Sun, 2021b; Jiu et al, 2020; Li et al, 2022; Liu, Li, et al, 2020a; Zhang et al, 2019). The evolutionary stage of the Mesozoic continental lake basin from the Chang 10 to the Chang 1 sedimentary period experienced lake basin expansion, shrinkage and disappearance.…”

Section: Geological Settingmentioning

confidence: 99%

“…From the Chang 6 stage, the lake basin stopped further expansion and entered the shrinking stage. Therefore, during this period, the deltas and sand bodies were well developed, forming favourable oil and gas reservoirs (Chu et al, 2020; Dan et al, 2019; Zhang, Meng, & Wang, 2020b).…”

Section: Geological Settingmentioning

confidence: 99%

“…At the beginning of the Chang 6 period, the lake basin stopped further expansion and entered a shrinking stage. Chang 3 to Chang 1 represent the period of the gradual disappearance of the lake basin until the complete disappearance of the Chang 1 period (Chu et al, 2020; Duan & Wu, 2019; Zhang, Liu, et al, 2020a; Zhang, Meng, & Wang, 2020b).…”

Section: Geological Settingmentioning

confidence: 99%

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Development characteristics of deepwater gravity flows and tight sandstone reservoir characteristics in Chang 6 in the Huaqing area, Ordos Basin, China

et al. 2022

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The tight sandstone reservoirs have become the focus of today's oil and gas exploration. To clarify the microscopic characteristics of the tight sandstone reservoirs of the Chang 63 deep water gravity flow origin in the Huaqing area, the Chang 63 gravity flow origin reservoirs in the study area are divided into three categories. They are the formation reservoir of sandy clastic flow (FROSF), formation reservoir of muddy debris flow deposits and turbidites (FROMT) and formation reservoir of slides and slumps (FROSS). In this study, core and logging data, thin sections, field emission scanning electron microscopy (FE‐SEM), and mercury intrusion capillary pressure (MICP) were combined to investigate the rock composition and pore‐throat characteristics of tight sandstone reservoirs with different types of gravity flow origins. The reservoir micro‐heterogeneity is also investigated in this paper. The results show that the reservoirs with different gravity flow origins are similar in lithology and are mainly composed of feldspar lithic sandstone and lithic feldspar sandstone. The pore types are mainly intergranular pores and feldspar‐dissolved pores. There are significant differences in the porosity, permeability, microscopic pore‐throat characteristics and microscopic heterogeneity of the reservoirs. From FROSF to FROMT and FROSS, the porosity, permeability, mercury inlet saturation, discharge pressure, median pressure and mercury removal efficiency gradually decrease. The tightness of the reservoir gradually increases. The storage capacity is gradually reduced. The disparity between the throat radius and pore radius gradually increases. The pore‐throat structure becomes more complex, and the microscopic heterogeneity of the reservoir gradually increases.

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“…Some palaeogeographical models suggest that the QB and North Qilian Belt (NQLB) were uplifted along the southern boundary of the SOB and were the main detrital sources (Qiu et al, 2015;Xie, 2016;Yang et al, 2014). Other palaeogeographic models suggest that sedimentary rocks from the NCB were the main detrital sources (Xie & Heller, 2013;Zhang et al, 2022;Zhang, Meng, & Wang, 2020), while few others suggest that the northern margin of the NCB and the Alxa Block were also detrital sources for the SOB during the Middle-Late Triassic (Figure 1a; Zhang, Liu, et al, 2016;Ding et al, 2021). However, this hypothesis for the northern sediment transport system conflicts with known geological facts related to the sedimentary filling of the basin, as the lake centre blocked the supply of detrital material from northern source areas.…”

Section: Introductionmentioning

confidence: 99%

Triassic temporal and spatial migration of the provenance along the South Ordos Basin: Insights into the tectonic evolution of Eastern Palaeo‐Tethys Ocean

Xu,

He,

et al. 2023

Basin Research

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Clarifying the role of mountain‐building processes in the filling history of large hinterland basins is an essential aspect of basin–mountain system research. We consider the case of the Triassic South Ordos Basin (SOB) to clarify these points. Located in the south‐western North China Block (NCB), the SOB which preserves the most complete Triassic deposition on the north of the Qinling Orogenic Belt (QB) is crucial for understanding the detailed tectonic processes of the QB. Sedimentological, petrological and zircon U–Pb geochronological signatures from the three parts (eastern, central and western) in the SOB indicate that the sediment source migrated both temporally and spatially. Stratigraphic correlation identified two fluvial progradational episodes from south to north in the fluvial–deltaic–lacustrine sedimentary system, one in the eastern SOB and the other in the central SOB. The Late Triassic detrital zircons in the central SOB with distinguishing Neoproterozoic ages were derived from the southern margin of the NCB and the QB. The western SOB exhibited the sediment source shifted from pre‐Triassic North Qilian Belt sedimentary cover to basement from the Middle‐to‐Late Triassic based on a zircon age transition from ca. 2000 to ca. 430 Ma. Late Triassic sediment sources also included the southern margin of the NCB and the QB. Differing provenances from east to west were also confirmed using thin section and heavy mineral analyses. Regional comparisons of zircon age distributions in the eastern SOB with published data indicate that detritus from the QB was first transported to the eastern SOB and then to the central and western SOB. Spatiotemporal changes in the sediment source and sedimentary filling transitions in the three parts of the SOB suggest that the QB underwent asynchronous uplift that began in the east during the Early Triassic and propagated westward, reaching its maximum extent in the early Late Triassic.

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Provenance analysis of the Middle Triassic Ordos Basin: Constraints from zircon U-Pb geochronology

Cited by 10 publications

References 50 publications

Sedimentary characteristics, formation conditions, and distribution mechanisms of beach bar sand bodies of Chang 8₂ submember, southwest Ordos Basin

Sedimentary characteristics, formation conditions, and distribution mechanisms of beach bar sand bodies of Chang 8₂ submember, southwest Ordos Basin

Development characteristics of deepwater gravity flows and tight sandstone reservoir characteristics in Chang 6 in the Huaqing area, Ordos Basin, China

Triassic temporal and spatial migration of the provenance along the South Ordos Basin: Insights into the tectonic evolution of Eastern Palaeo‐Tethys Ocean

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Provenance analysis of the Middle Triassic Ordos Basin: Constraints from zircon U-Pb geochronology

Cited by 10 publications

References 50 publications

Sedimentary characteristics, formation conditions, and distribution mechanisms of beach bar sand bodies of Chang 82 submember, southwest Ordos Basin

Sedimentary characteristics, formation conditions, and distribution mechanisms of beach bar sand bodies of Chang 82 submember, southwest Ordos Basin

Development characteristics of deepwater gravity flows and tight sandstone reservoir characteristics in Chang 6 in the Huaqing area, Ordos Basin, China

Triassic temporal and spatial migration of the provenance along the South Ordos Basin: Insights into the tectonic evolution of Eastern Palaeo‐Tethys Ocean

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Sedimentary characteristics, formation conditions, and distribution mechanisms of beach bar sand bodies of Chang 8₂ submember, southwest Ordos Basin

Sedimentary characteristics, formation conditions, and distribution mechanisms of beach bar sand bodies of Chang 8₂ submember, southwest Ordos Basin