The characteristic and evolution of coal-forming swamp in Hanshuiquan district, Santanghu Coalfield, Xinjiang, NW China, during the Middle Jurassic: evidence from coal petrography, coal facies and sporopollen

Feng, Shan; He, Jianxing; Tian, Jijun; Lu, Xiaofeng; Yang, Bo

doi:10.1007/s40789-018-0230-5

Cited by 10 publications

(5 citation statements)

References 42 publications

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“…The subsidence and uplift of strata caused by tectonic movement will affect the gas generation and storage conditions of coal seams. The Xishanyao Formation in the research area has experienced two distinct subsidence-uplift processes [57]. The first stage of subsidence took place in the Late Jurassic, leading to a coal burial depth of 500-600 m and formation temperature close to 55 • C, and then uplifted to the surface in the Late Jurassic.…”

Section: Burial Historymentioning

confidence: 99%

Coalbed Methane Enrichment Regularity and Model in the Xishanyao Formation in the Santanghu Basin, NW China

Li,

Zhou,

Jiao

et al. 2023

Minerals

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The Santanghu Basin is a typical low-rank coal-bearing basin in northwest China, with abundant coalbed methane (CBM) resources. However, the understanding of the main controlling factors and reservoir formation models of CBM in low-rank coal is still insufficient, which has restricted the exploration and development of CBM in this region. In this paper, the CBM enrichment controlling factors and enrichment models are analyzed based on the aspects of sedimentary environment, reservoir characteristics, sealing conditions, and hydrogeological conditions after systematically analyzing the geological characteristics of coal measures. The research results indicate that the coal seams of the Xishanyao Formation in the Santanghu Basin are stably developed, with the main macerals being vitrinite and a lower degree of coalification belonging to low-rank coal; the highest content of CBM can reach 7.17 m3/t, and the methane is mainly composed of biogenic gas supplemented by thermogenic gas; the roof lithology of the coal seam is mainly mudstone and siltstone, with good sealing conditions. Finally, two enrichment modes of coalbed methane in slope zones are proposed, namely, the CBM enrichment in the slope zone and the CBM enrichment by fault-hydraulic plugging. The results of this study can serve as a guide for the exploration and development of the deep-buried coalbed methane in the low-rank coal areas.

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Section: Burial Historymentioning

confidence: 99%

Coalbed Methane Enrichment Regularity and Model in the Xishanyao Formation in the Santanghu Basin, NW China

Li,

Zhou,

Jiao

et al. 2023

Minerals

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“…These changes in floral compositions indicate that a dramatic temperature rise and increase in aridity occurred during the late Early Jurassic in North China. Ptilophyllum is usually considered as an important indicator of hot and relative arid environments [56].…”

Section: Palynological Datamentioning

confidence: 99%

“…was dominated by Gymnospermae with very few fern spores. Most of the identified taxa have known distributions that were limited to the Jurassic, with only a small number having reported first appearances during the Late Triassic [56,57]. Cycadopites sp.…”

Section: Palynological Datamentioning

confidence: 99%

Paleoclimatic and Redox Condition Changes during Early-Middle Jurassic in the Yili Basin, Northwest China

et al. 2021

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The Jurassic was mainly a “greenhouse” period characterized by global warming and by significant peat accumulations in some continental basins. However, studies of Jurassic climate and environments have mainly focused on marine records and only a few on terrestrial sediments. Yili Basin, a mid-latitude terrestrial basin in present Northwest China, included accumulation of the important recoverable coal seams. In this study, geological data, clay mineral analysis, and palynological assemblages were employed on fine-grained samples from the Su’asugou section in southern Yili Basin. The factors (paleoclimate, depositional conditions, and paleo-vegetation) impacting peat accumulation were investigated. The results suggest that the siliciclastics may have been derived from exposed Carboniferous rocks in a continental arc environment. A warm and humid paleoclimate in the Yili basin dominated during the early-Early Jurassic deposition of the Badaowan Formation and the Middle Jurassic deposition of the Xishanyao Formation. This climate contributed to high sedimentary rates and to a high productivity of peat-forming paleo-vegetation that was preserved under dysoxic conditions. In contrast, during the late-Early Jurassic between these two formations, the Sangonghe Formation was an interval of relatively aridity that included red beds preserved under more hypoxic sedimentary conditions, and with an interruption in peat formation and preservation.

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“…China has a large amount of shale resources and about 35 separate organic rich shale units from Mesoproterozoic through Cenozoic strata with more to be found (Zou et al, 2019). The Middle Jurassic Xishanyao Formation is one of these rock units which is widely distributed in western China and is spread over several basins such as the Junggar Basin, Turpan-Hami Basin, Yili Basin and Santanghu Basin, with abundant resources of coal and coalbed methane as well as hydrocarbons (Feng et al, 2019;Li et al, 2018Li et al, , 2019Qin et al, 2020). During the paleo-lake flooding, the Xishanyao Formation, located in the Junggar Basin, was developed by typical gray-black mudstone depositions interbedded with coal (Li et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…In the Junggar Basin, main studies have been focused on the Lucaogou Formation which is a typical shale oil reservoir in Northwestern China (Liu et al, 2017a) while studies on the Xishanyao Formation are very limited. Feng et al (2019) carried out the geochemical analysis of the Xishanyao Shale Formation and found that vitrinite is the most abundant maceral in the Xishanyao Formation. However, studies that focus on the pore structures of the Xishanyao Formation are rarely conducted.…”

Section: Introductionmentioning

confidence: 99%

Pore structure and adsorption hysteresis of the middle Jurassic Xishanyao shale formation in the Southern Junggar Basin, northwest China

Liu

Gao

Liu

et al. 2021

Energy Exploration & Exploitation

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In order to understand the pore structures of the Middle Jurassic Xishanyao Formation in the Junggar Basin, 11 shale samples from a single well were picked and were subjected to several analyses including mineralogy, (programmed) Rock-Eval pyrolysis for geochemical and N2 adsorption for pore structure analysis. The results showed that the mean value of total organic carbon (TOC) content of these samples is around 1.54% while Tmax varies between 429 to 443°C, indicating they are in the oil window. Mineral assemblages of the samples is mainly quartz and clay (illite, chlorite and kaolinite). Moreover, negative correlations between the K-feldspar/plagioclase and micro-mesopore volume was found, depicting that few of such pore sizes exist in these two abundant minerals. In contrast, micro, meso and macro pores all were detected in clay minerals. Particularly, the pores with radii of around 5.35 nm were abundant in clay minerals and there was not a robust relationship between the organic matter, surface area and pore volume. Finally, fractal analysis was performed to better delineate heterogenous characteristics of pore structures which showed that D2 (representing the larger pores) is greater than D1 (smaller pores). In addition, the differences between the fractal dimensions of the adsorption and desorption (D2d–D2a) branches to better interpret the hysteresis, was defined. The positive correlation between the (D2d–D2a) and the meso-macro pore volume, pointed out that the meso-macro condensation is the main reason for hysteresis that was observed in N2 adsorption experiments in the Xishanyao Shale samples.

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The characteristic and evolution of coal-forming swamp in Hanshuiquan district, Santanghu Coalfield, Xinjiang, NW China, during the Middle Jurassic: evidence from coal petrography, coal facies and sporopollen

Cited by 10 publications

References 42 publications

Coalbed Methane Enrichment Regularity and Model in the Xishanyao Formation in the Santanghu Basin, NW China

Coalbed Methane Enrichment Regularity and Model in the Xishanyao Formation in the Santanghu Basin, NW China

Paleoclimatic and Redox Condition Changes during Early-Middle Jurassic in the Yili Basin, Northwest China

Pore structure and adsorption hysteresis of the middle Jurassic Xishanyao shale formation in the Southern Junggar Basin, northwest China

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