Sequence stratigraphy and Quaternary depositional systems in the Sanhu area of the Qaidam Basin, northwest China

Liu, Z.; Fu, Sheng; Jia, Haibo; Tian, Jinqiang; Chen, Y. H.; Dong, Chunyan

doi:10.1080/08120099.2018.1532928

Cited by 4 publications

(3 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Sedong structure was uplifted only after K1, while no anticline has been formed on the southern slope thus far. Moreover, the rate of uplift was uneven, with a tendency to gradual intensification, especially at the end of the Pleistocene (after K5), when the anticline was rapidly uplifted (Xue and Yang, 2002; Guo et al, 2012; Wu et al, 2013; Liu et al, 2019).…”

Section: Geological Settingmentioning

confidence: 99%

See 1 more Smart Citation

Mechanism of organic matter enrichment in a basin with shallow biogenic gas: a case study of Pleistocene shale in the Qaidam Basin

Liu,

Jiang,

Tang

et al. 2024

J Quaternary Science

View full text Add to dashboard Cite

Organic matter is the material basis of shale gas. The Qaidam Basin is a key exploration and development area for shallow biogenic shale gas in China. In this study, we have focused on Quaternary Pleistocene shale in the Qaidam Basin, and the mechanism of organic matter enrichment was investigated in terms of water column stratification and paleoclimate. The results show that the K9–K7 section has greater biological productivity than the K5–K4 section. During the early–middle Pleistocene (K9–K7 deposition period), due to a warm and humid climate, the water column was strongly stratified and herbaceous plants developed, resulting in increased biological productivity. Stronger stratification also led to a reducing environment in the lower layer, which was conducive to the preservation of organic matter from the upper layer. During the late Pleistocene (K5–K4 deposition period), with a dry and hot climate, stratification became weaker and the vegetation evolved into woody plants, reducing biological productivity. Weaker stratification led to destruction of the reducing environment, which was not conducive to enrichment of the sedimentary organic matter. Moreover, the increased temperatures increased the activity of methanogenic bacteria, which consumed a lot of the organic matter.

show abstract

Section: Geological Settingmentioning

confidence: 99%

“…The stratigraphy of the Qaidam Basin is well developed, covering the Proterozoic, Paleozoic, Mesozoic and Cenozoic from bottom to top (Sun et al, 2004; Wang et al, 2012; Liu et al, 2019; Yin et al, 2021). The Cenozoic Quaternary is the focus of this study.…”

Section: Geological Settingmentioning

confidence: 99%

Mechanism of organic matter enrichment in a basin with shallow biogenic gas: a case study of Pleistocene shale in the Qaidam Basin

Liu,

Jiang,

Tang

et al. 2024

J Quaternary Science

View full text Add to dashboard Cite

show abstract

“…1c). Synergistic anticlinal traps developed on the North Slope and are characterized by large deep and small shallow tectonic amplitudes and thin topward thicknesses (Pang et al, 2004;Liu et al, 2019;Shan et al, 2020).…”

Section: Tectonic Characteristicsmentioning

confidence: 99%

Evaluation of organic matter abundance of source rocks of biogenic gas: a case from the Quaternary Qigequan Formation Shale, Sanhu Depression, Qaidam Basin

Liu,

Jiang,

Tang

et al. 2024

Episodes

View full text Add to dashboard Cite

A correct understanding of organic matter abundance is key to understanding the conditions necessary for generating biogenic gas, seeking favorable exploration intervals and fields and evaluating resources correctly. The Qigequan Formation shale of the Quaternary in the Sanhu Depression of the Qaidam Basin is taken as the research object. The abundance of dissolved organic matter was determined through total carbon, pyrolysis and other experiments. The evaluation criteria were established and applied. The resource quality is calculated. The results are as follows. (1) Dissolved organic matter is the basis for biogenic gas generation and should be emphasized in the evaluation. (2) The shale has a relatively high dissolved organic carbon (DOC) content, with an average of 2.48 times that of insoluble organic carbon. (3) The DOC of the good source rock is more than 0.60%, that of the medium is 0.25~0.60%, and that of the poor is less than 0.25%. (4) The distribution of good source rocks is influenced by the position and depth of the water column and the paleoclimate. Favorable intervals are mainly in the upper sections of K10, K9 and K8 and the middle section of K7. The favorable areas are mainly the Tainan, Sebei and Sedong areas.

show abstract

Direct S-wave seismic data interpretation for channel sand reservoir at Sanhu area, West China

Zhang,

Deng,

Wang

et al. 2023

Third International Meeting for Applied Geoscience &Amp; Energy Expanded Abstracts

View full text Add to dashboard Cite

Sequence stratigraphy and Quaternary depositional systems in the Sanhu area of the Qaidam Basin, northwest China

Cited by 4 publications

References 32 publications

Mechanism of organic matter enrichment in a basin with shallow biogenic gas: a case study of Pleistocene shale in the Qaidam Basin

Mechanism of organic matter enrichment in a basin with shallow biogenic gas: a case study of Pleistocene shale in the Qaidam Basin

Evaluation of organic matter abundance of source rocks of biogenic gas: a case from the Quaternary Qigequan Formation Shale, Sanhu Depression, Qaidam Basin

Direct S-wave seismic data interpretation for channel sand reservoir at Sanhu area, West China

Contact Info

Product

Resources

About