The effect of river-delta system on the formation of the source rocks in the Baiyun Sag, Pearl River Mouth Basin

Li, Wenhao; Zhang, Zhihuan; Li, Youchuan; Fu, Ning

doi:10.1016/j.marpetgeo.2016.05.033

Cited by 37 publications

(24 citation statements)

References 16 publications

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“…The oil and gas discovered in the northern South China Sea (SCS) are mainly from transitional facies source rocks, and partly from the marine source rocks. Natural gas in Yacheng 13-1 field of the Qiongdongnan (QDN) Basin is mainly originated from source rocks in the Yacheng Formation developed in transitional facies. − The petroleum from the Baiyun Sag in the Pearl River Mouth (PRM) Basin of the northern SCS is mainly generated by source rocks in the Enping Formation developed in transitional facies, and partly by the marine source rocks in the Zhuhai Formation. − Furthermore, the lacustrine source rocks developed in Eocene in the northern SCS are considered to be a set of oil-prone source rocks. ,− The Eocene lacustrine source rocks from the Wenchang Formation in the PRM Basin have been proven to contribute greatly to crude oils. − …”

Section: Introductionmentioning

confidence: 99%

Geochemical Characteristics and Developmental Models of the Eocene Source Rocks in the Qiongdongnan Basin, Northern South China Sea

Zhang

Zheng

et al. 2017

Energy Fuels

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Seismic data show that a set of Eocene lacustrine source rocks exists in the Qiongdongnan (QDN) Basin, northern South China Sea (SCS). The high content of C30 4-methylsteranes detected in the crude oil suggests the existence and the effectiveness of the lacustrine source rocks, and these compounds were not found in the Oligocene and Miocene source rocks. The above date indicates that the Eocene source rocks are effective and oil-prone. Lacustrine source rocks in faulted period have high organic matter abundance and better organic matter types in the SCS and other typical passive continental margin basins in the world. Lacustrine source rocks in the Eocene source rocks (E2w) from the Baiyun Sag of the Pearl River Mouth Basin have relatively high total organic content (TOC) values, which can be explained by moderate to high paleoproductivity and anoxic environment. Therefore, it can be speculated that the Eocene source rocks have good hydrocarbon potential in the QDN Basin. The developmental pattern of Eocene source rocks is revealed as follows: In mid-deep lake environment, high-quality source rocks could be formed, because of high productivity and better organic matter preservation conditions, and the central depression belt is the most favored zone beneficial to Eocene source rock formation, because of the relatively large-scale mid-deep lake facies. In shore-shallow lake and delta environment, high-quality source rocks could not be formed, because of the poor organic matter preservation conditions.

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Section: Introductionmentioning

confidence: 99%

Geochemical Characteristics and Developmental Models of the Eocene Source Rocks in the Qiongdongnan Basin, Northern South China Sea

Zhang

Zheng

et al. 2017

Energy Fuels

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“…It is characterized by sapropelic kerogen and was deposited in a reducing sedimentary environment (Zhu et al, 2012;Pang et al, 2014;Zhang et al, 2014a, b). The Enping Formation is characterized by mixed sapropelic-humic type kerogen and has abundant terrigenous organic matter (Zhu et al, 2012;Pang et al, 2014;Zhang et al, 2014a, b;Li et al, 2016). Therefore, we believe that the Wenchang Fig.…”

Section: Characteristics Of the Source Rocksmentioning

confidence: 94%

Petroleum Migration Characteristics in the Northeastern Part of the Baiyun Depression, Pearl River Mouth Basin, South China Sea

Zeng

Wang

Guo³

et al. 2021

Acta Geologica Sinica (Eng)

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This paper investigates the origin and migration characteristics of petroleum in the northeastern part of the Baiyun Depression, Pearl River Mouth Basin (PRMB). The discovered petroleum in the study area is mainly located in the Lower Zhujiang Member (N 1 z 2) and mainly originated from the Enping Formation source rocks in the eastern sag. Active faults (vertical migration) and N 1 z 2 sandstones (lateral migration) acted as the petroleum migration systems. The fault activities in the Dongsha event controlled the episodic petroleum migration. Fractures in the fault zones provided effective conduits, and overpressure was the driving force. The vertical migration could not cross the fault zones laterally. The petroleum injection areas in the carrier beds were the contact zones of petroleum-migration faults and carrier beds. The lateral migration was steady-state migration, and buoyancy was the driving force. The migration pathways in the carrier beds were controlled by the structural morphology. Secondary petroleum migration in the study area could be divided into two parts: vertical migration along the fractures in the fault zones and lateral migration through preferential petroleum migration pathways (PPMPs) in the carrier beds. The petroleum migration behaviors, including migrating direction, driving force, and migration pattern, in the faults and sandstone carrier beds were quite different. This study provides a typical example for comprehending secondary migration processes and has great importance for determining future exploration targets in the deep-water area of the PRMB.

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“…Various reasons have been proposed to account for the positive association between transgressions and the deposition of organic-rich facies (Klemme and Ulmishek, 1991;Arthur and Sageman, 1994;Arthur, 2005). including: 1) transgressive periods may enhance seasonal or longer-term water-column stratification and development of anoxia; 2) rising sea levels may promotes near-shore trapping of terrigenous clastic material, creating condensed intervals which are characterized by enrichment in organic carbon (Arthur, 2005); and 3) land-derived nutrients give rise to surface plankton booms, resulting in high biological productivity (Hao et al, 2011;Li et al, 2016).…”

Section: Controls On Source Rocks Depositionmentioning

confidence: 99%

Hydrocarbon Potential of the Late Permian and the Late Triassic Source Rocks from the Qamdo (Changdu) Basin, Eastern Tibet and Its Linkage with the Sea Level Change

Wang

2021

Front. Earth Sci.

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The Qamdo Basin in eastern Tibet has significant petroleum potential and previous studies indicate that the basin contains thick potential source rocks of the Late Permian and the Late Triassic ages. In this paper, the petroleum potential of samples from measured the Upper Permian and Upper Triassic outcrop sections was evaluated on the basis of sedimentological, organic petrographic and geochemical analyses. Initial evaluations of total organic carbon contents indicated that shale samples from the Upper Permian Tuoba Formation and the Upper Triassic Adula and Duogala Formations have major source rock potential, while carbonate rocks from the Upper Triassic Bolila Formation are comparatively lean in organic matter More detailed analyses of OM-rich shale samples from the Tuoba, Adula and Duogala Formations included Rock-eval, elemental analyses, gas chromatography and organic petrography. Maceral compositions and plots of atomic O/C versus H/C indicate that the organic matter present in the samples is primarily Type II with a mixed source. Analyses of acyclic isoprenoid biomarkers indicate the organic matter was deposited under reducing and sub-to anoxic conditions. Based on the high vitrinite reflectance (Ro>1.3%) and Rock-eval data, the samples are classified as highly to over-mature, suggesting that the Tuoba, Adula and Duogaila Formation shales may generate thermogenic gas. Source rock intervals in the three formations are interpreted to have been deposited in marginal-marine environment during transgressions and under a warm and moist climatic condition.

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The effect of river-delta system on the formation of the source rocks in the Baiyun Sag, Pearl River Mouth Basin

Cited by 37 publications

References 16 publications

Geochemical Characteristics and Developmental Models of the Eocene Source Rocks in the Qiongdongnan Basin, Northern South China Sea

Geochemical Characteristics and Developmental Models of the Eocene Source Rocks in the Qiongdongnan Basin, Northern South China Sea

Petroleum Migration Characteristics in the Northeastern Part of the Baiyun Depression, Pearl River Mouth Basin, South China Sea

Hydrocarbon Potential of the Late Permian and the Late Triassic Source Rocks from the Qamdo (Changdu) Basin, Eastern Tibet and Its Linkage with the Sea Level Change

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