Discovery and significance of Quaternary aqueously deposited aeolian sandstones in the Sanhu area, Qaidam Basin, China

Mao, Wenjing; Guo, Shaohui

doi:10.1007/s12182-017-0214-x

Cited by 7 publications

(1 citation statement)

References 31 publications

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“…Approximately half of its surface area is decorated with yardangs shaped by a predominant northwesterly wind (Hu et al, ; Li et al, ), particularly in its western part (Figure a). The sediments removed by wind are generally Neogene‐Quaternary lacustrine sandstone and mudstone, which form numerous migratory dunes within the basin or are redeposited in the more humid eastern QB or the Chinese Loess Plateau farther east (Kapp et al, ; Mao & Guo, ; Rohrmann et al, ; Yu et al, ). Wind erosion began as early as ~2.4–2.8 Ma and continues fitfully to the present in the QB (Heermance et al, ; Kapp et al, ).…”

Section: Background Settingmentioning

confidence: 99%

Quantifying Wind Erosion During the Late Quaternary in the Qaidam Basin, Central Asia

Prush

Lin

et al. 2019

Geophysical Research Letters

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Wind erosion is an important surface process on terrestrial planets but is difficult to quantify particularly on long‐term timescales. Here we use high‐resolution Terrestrial Laser Scanning and cosmogenic Beryllium‐10 (10Be) exposure dating to investigate the yardangs, a wind‐eroded landform with aerodynamic forms, within the western Qaidam Basin, Central Asia. The results indicate that the yardangs started to form at ~105 ka, coincident with the early phase of the arid last glacial period. We further calibrated the wind erosion rate in the last glacial period to be ~0.26 mm/a, twice as fast as that of the present‐day interglacial period in our study site. Our results highlight the severe wind erosion during glacial periods and emphasize the fundamental control of global glacial‐interglacial climate oscillations on the secular variation in wind erosion in the Qaidam Basin during the late Quaternary period.

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Section: Background Settingmentioning

confidence: 99%

Quantifying Wind Erosion During the Late Quaternary in the Qaidam Basin, Central Asia

Prush

Lin

et al. 2019

Geophysical Research Letters

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Genetic analysis and identification of low‐resistivity gas reservoirs of southwestern Sulige gas field in China

Yang

Zhang

et al. 2022

Energy Science & Engineering

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Sulige gas field is the largest natural gas producing area in China. Due to the "water blocking" effect, the gas-water layer significantly influences the development of gas reservoirs. The existence of low-resistivity gas layers in the He 8 member of the Shihezi Formation in the southwestern Sulige gas field makes it challenging to distinguish the gas layers from the gas-water layers using conventional identification methods. To effectively identify the low-resistivity gas layers, their genetic mechanisms are analyzed by studying their lithology and pore structural characteristics based on the well logging and core experimental data. The low-resistivity gas layers are main affected by three causes: (1) electrical conductivity of argillaceous laminae in sandstone,(2) additional conductivity of clay minerals, and (3) high bound water saturation caused by the development of micropores and clay minerals in sandstone. Herein, to effectively distinguish the low-resistivity gas layer from the gas-water layer based on the genetic mechanism of the low-resistivity gas layer, first, a gas-bearing index was constructed to characterize the gas-bearing properties of the reservoir using the neutron logging and density logging curves after eliminating the influence of the dispersed shale. Second, a model to calculate the bound water saturation was constructed by selecting sensitive parameters with respect to the causes of bound water. Then, two plots, namely the gas-bearing index-natural gamma relative value cross-plot and the bound water content-porosity cross-plots, were constructed using the gas testing data, and the identification standard of the low-resistivity gas and gas-water layers was established. The interactive identification of the two cross-plots effectively distinguished the low-resistivity gas layer from the gaswater layer, thereby providing a basis for understanding the distribution of gas and water in the southwestern Sulige gas field, which may guide further exploration and the deployment of the development well pattern.

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Reservoir characteristics and control mechanism of resistivity low-contrast oil pays in Chang 8 tight sandstone of Longdong West area, Ordos Basin

Bai

Tan

Shi

et al. 2021

J Petrol Explor Prod Technol

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Log interpretation and evaluation of tight sandstone reservoir in Chang 8 Member of Longdong West area, Ordos Basin, China, are facing great challenges due to the co-development of normal oil pay and resistivity low-contrast oil pay. To better guide the exploration and development of oil resources in this area, the reservoir characteristics and control mechanism of resistivity low-contrast oil pay were studied. Firstly, the reservoirs were divided into resistivity low-contrast oil pay (RLP) and normal oil pay (NP) based on the relative value of the apparent resistivity increase rate. Then, the difference of reservoir characteristics between RLP and NP is analyzed by comparing a series of experimental data and real logging data in those two reservoir types. Finally, the control mechanism of RLP was studied from reservoir micro-factors and regional macro-factors, respectively. It is found that the chlorite and illite are the most abundant clay minerals in RLP and NP, respectively. Compared with NP reservoir, the average porosity of RLP is better, but the pore space is mainly composed of micropores, which lead to smaller average pore throat radius and poor pore structure. The high irreducible water saturation and high formation water salinity reduced the reservoir resistivity from micro-aspect. Besides, the difference of hydrocarbon expulsion capacity of source rock and the regional difference of formation water salinity controlled the distribution of RLP and NP. Comprehensive consideration of the reservoir micro-factors and regional macro-factors is important to carry out effective logging interpretation and evaluation.

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Discovery and significance of Quaternary aqueously deposited aeolian sandstones in the Sanhu area, Qaidam Basin, China

Cited by 7 publications

References 31 publications

Quantifying Wind Erosion During the Late Quaternary in the Qaidam Basin, Central Asia

Quantifying Wind Erosion During the Late Quaternary in the Qaidam Basin, Central Asia

Genetic analysis and identification of low‐resistivity gas reservoirs of southwestern Sulige gas field in China

Reservoir characteristics and control mechanism of resistivity low-contrast oil pays in Chang 8 tight sandstone of Longdong West area, Ordos Basin

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