Coal seam development characteristics and distribution predictions in marginal sea basins: Oligocene Yacheng Formation coal measures, Qiongdongnan Basin, northern region of the South China Sea

Wang, D. D.; Dong, Guoqi; Zhang, G. C.; Li, Z. X.; Mao, Q.; Song, Guangzeng

doi:10.1080/08120099.2019.1661286

Cited by 8 publications

(4 citation statements)

References 13 publications

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“…However, the shortage of boreholes and poor seismic profiles made it difficult to research the coal-measure source rocks. It was known that the development of basin-marginal deltas was advantageous to form the coal-measure source rocks, and the larger basin-marginal deltas were, the more beneficial for forming the coal-measuring source rocks (Li et al., 2018; Zhang et al., 2019), which were mainly composed of two parts in South China Sea: coal seams and terrestrial marine mudstone (Figure 14) (Wang et al., 2019). The temporal–spatial evolution of the basin-marginal deltas determined the characteristics of the above two types of coal-measure source rocks.…”

Section: Discussionmentioning

confidence: 99%

“…The temporal–spatial evolution of the basin-marginal deltas determined the characteristics of the above two types of coal-measure source rocks. For the terrestrial marine mudstone, the TOC could be adopted as the parameter to evaluate the relationship between the basin-marginal delta and terrestrial marine mudstone (Wang et al., 2019) (Table 1). The more greatly the TOC developed in the delta, the more beneficial the delta would be for the terrestrial marine mudstone (Li et al., 2018).…”

Section: Discussionmentioning

confidence: 99%

“…For the coal seams, the thickness could be adopted as the parameter to evaluate the relationship between the coal seam and the deltas (Wang et al., 2019). In Table 2, W2 exhibits the thickest coal seam, which reflects the fact that the fan delta was more favorable to coal formation than the braided river delta in the QDN Basin.…”

Section: Discussionmentioning

confidence: 99%

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Characterization and formation mechanism of the basin-marginal deltas in the Paleogene Qiongdongnan Basin, Northwestern South China Sea

Song

Zhang

et al. 2020

Energy Exploration & Exploitation

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In this study, based on seismic profiles, complemented with boreholes and well logs, two types of deltas are recognized in the Paleogene Qiongdongnan Basin, namely fan deltas and braided river deltas, and their temporal–spatial evolution characteristics and associated controlling factors are studied. The results show the following: (1) The base-level cycle and episodic rifting lead that the characteristics of the basin-marginal deltas vary among different system tracts, third-order sequences, and second-order sequences or rifting stages, i.e. the temporal evolution of the basin-marginal deltas. Among the different system tracts in each third-order sequences, the deltas in the lowstand system tracts are vertically thick with small horizontal extension, while those in the transgressive system tracts present retrogradation with limited vertical thickness and horizontal extension, and those in the highstand system tracts turn to present large extension and develop toplap points. Among the different third-order sequences in each rifting stage, the extension of the deltas presents a pattern “small-medium-large” from bottom to top. Among different rifting stages, the deltas also exhibit different characteristics in terms of extension and thickness, and even the type may change. (2) The paleogeomorphology controls the characteristics of the deltas in lateral space, which is mainly reflected by the fact that the gradient of the paleogeomorphology influences the scale and type of the deltas. This study will enhance our understanding of the relative influence of the controlling factors exerted on fan or braided river deltas, and aid in the exploration of the coal-measure source rocks in the Qiongdongnan Basin, which is a typical basin lacking boreholes, located in the South China Sea.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Characterization and formation mechanism of the basin-marginal deltas in the Paleogene Qiongdongnan Basin, Northwestern South China Sea

Song

Zhang

et al. 2020

Energy Exploration & Exploitation

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“…The complex geological conditions present great challenges for deep-water petroleum exploration. The Oligocene marine terrigenous source rocks, widely distributed throughout the Qiongdongnan Basin, received substantial terrestrial organic material transported by fluvial-delta systems and are regarded as the primary oil and gas sources in the deep-water areas. , These source rocks are characterized by huge thickness but relatively low organic matter abundance, mainly comprising Type III to II 2 organic matter, which is predominantly associated with gas generation and supplemented by oil generation . In the past decade, a series of deep-water gas fields, such as LS17, LS18, LS22, LS25, and BD21, have been discovered in the Central Depression of the Qiongdongnan Basin…”

Section: Geological Settingmentioning

confidence: 99%

Influence of HEM Drilling Fluid on Organic Geochemical Characteristics of Deep-Water Source Rocks in the Qiongdongnan Basin

Zhang,

Hou,

Cheng

et al. 2024

ACS Omega

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The influence of oil-based drilling fluid on the geochemical characteristics of source rocks has been widely reported in the northern South China Sea. However, contamination from water-based HEM drilling fluid has long been neglected in previous deep-water petroleum exploration. To further understand the impacts of HEM drilling fluid on deep-water source rocks, the organic matter abundance and type, kerogen maceral composition, and saturated biomarkers of the deep-water source rocks in the Qiongdongnan Basin were investigated. The influence of HEM drilling fluid on the organic geochemistry data of cuttings is significant but minor for sidecores. It is evident that the organic drilling additives in HEM drilling fluid can increase the organic matter abundance and optimize the organic matter types of shale cuttings. Specifically, the total organic carbon, S 1 , S 2 , and hydrogen index are increased by 28.5 ± 6.1, 90.8 ± 2.0, 34.2 ± 2.0, and 51.9 ± 4.0%, respectively. Furthermore, the organic drilling additives will greatly enhance the levels of C 29 regular steranes, especially for C 29 -ααα-20R sterane, with the influence still persisting even when conducting GC-MS-MS analysis. The highly abundant 17α (H) -22, 29, 30-trisnorhopane, 17β (H)-22, 29, 30-trisnorhopane, C 29−31 17α (H), 21β (H) hopanes, and C 29−31 17β (H), 21α (H) hopanes may directly originate from the organic drilling additives. It is dangerous to directly use organic geochemical data from deep-water source rock cuttings contaminated by HEM drilling fluid as it may lead to conclusions that are entirely inconsistent with the basin's geological background.

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Aliphatic biomarker signatures of early Oligocene—early Miocene source rocks in the central Qiongdongnan Basin: Source analyses of organic matter

Hou

Cheng

et al. 2022

Acta Oceanol. Sin.

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Coal seam development characteristics and distribution predictions in marginal sea basins: Oligocene Yacheng Formation coal measures, Qiongdongnan Basin, northern region of the South China Sea

Abstract: Copies of Supplementary Papers may be obtained from the Geological Society of Australia's website (www.gsa.org.au), the Australian Journal of Earth Sciences website (www.ajes.com.au) or from the National Library of Australia's Pandora archive (https://pandora.nla.gov.au/tep/150555).

Cited by 8 publications

References 13 publications

Characterization and formation mechanism of the basin-marginal deltas in the Paleogene Qiongdongnan Basin, Northwestern South China Sea

Characterization and formation mechanism of the basin-marginal deltas in the Paleogene Qiongdongnan Basin, Northwestern South China Sea

Influence of HEM Drilling Fluid on Organic Geochemical Characteristics of Deep-Water Source Rocks in the Qiongdongnan Basin

Aliphatic biomarker signatures of early Oligocene—early Miocene source rocks in the central Qiongdongnan Basin: Source analyses of organic matter

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