Petroleum generation, migration, and entrapment in the Zhu 1 depression, Pearl River Mouth basin, South China Sea

Robison, Coleman R.; Elrod, L. W.; Bissada, K. K.

doi:10.1016/s0166-5162(98)00023-8

Cited by 39 publications

(27 citation statements)

References 14 publications

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“…The modeling results indicate that hydrocarbon generation potential of the Wenchang Fm in the Huixi half-graben is much higher than that in the Huibei halfgraben, with oil generation potential of 70 mg/g⋅TOC and gas generation potential of around 150 mg/g⋅TOC. Hydrocarbon expulsion of the Wenchang Fm began at 33.9 Ma and was Wenchang dark mudstone and shoreline-shallow lacustrine Enping dark mudstone and accumulated via lateral migration from the deeply buried source rocks in the HZS [2,3,43,44,47]. The modeling results indicate that oil expulsion in the HZS is mainly from the Eocene Wenchang source rocks and occurred during postrift stage.…”

Section: Timing Of Hydrocarbon Generation and Expulsionmentioning

confidence: 92%

“…The ratio of pristane (Pr) and phytane (Ph) value is 6.35 in the Wenchang source rocks from well 243 with low content of 4-methyl sterane (Figure 10), which means that the source rocks were formed in a shallow water environment. The ratio of Pr/Ph value is 2.70 in the Wenchang source rocks from well 132 with high content of 4-methyl sterane, which indicates that the source rock is originated from lacustrine with algal input ( [43,44], Fu and Zhu, 2007). The ratio of Pr/Ph values is more than 6 in the Enping source rocks.…”

Section: Kerogen Typementioning

confidence: 96%

“…The ratio of Pr/Ph values is more than 6 in the Enping source rocks. The 4-methyl sterane content is low and the content of C 29 sterane is relatively higher than the levels of C 27 sterane and C 28 sterane (Figure 10), which indicates that the Enping Fm developed in the environment containing both algal and land plant material ( [43,44], Fu and Zhu 2007).…”

Section: Kerogen Typementioning

confidence: 99%

“…(Figure 2). During the Paleogene continental rift stage, the Zhu-Qiong I (49.0 Ma) and Zhu-Qiong II Movement (38.0 Ma) not only formed the structural configuration of the HZS [43,44,57] but also developed regional unconformities ( Figure 13(f)). In the early Oligocene, the Nanhai Movement (33. to steady thermal subsidence ( Figure 13(e)).…”

Section: Formation Tops and Lithologiesmentioning

confidence: 99%

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Reconstruction of the Cenozoic History of Hydrocarbon Fluids from Rifting Stage to Passive Continental Margin Stage in the Huizhou Sag, the Pearl River Mouth Basin

Jiang²,

Jiang

et al. 2017

Geofluids

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The Eocene lacustrine sediments are the primary source rocks in the Huizhou Sag of the Pear River Mouth Basin. This study employs basin modeling for four representative wells and two profiles in the Huizhou Sag to reconstruct the process of generation, expulsion, migration, and accumulation of hydrocarbon fluids. The Eocene source rocks started to generate hydrocarbon at 33.9 Ma and are currently in a mid-mature and postmature stage. Hydrocarbons are mainly expelled from the Eocene Wenchang Fm, and the contribution of the Eocene Enping formation is minor. Under the driving forces of buoyancy and excess pressure, major hydrocarbons sourced from the Eocene source rocks firstly migrated laterally to the adjacent Eocene reservoirs during the postrift stage, then vertically via faults to Oligo-Miocene carrier beds, and finally laterally to the structural highs over a long distance during the Pliocene-Quaternary Neotectonic stage, which is controlled by both structural morphology and heterogeneity of carrier beds. Fault is the most important conduit for hydrocarbon fluid migration during the Neotectonic stage. Reactivation of previous faults and new-formed faults caused by the Dongsha Movement (9.8-4.4 Ma) served as vertical migration pathways after 10.0 Ma, which significantly influenced the timing of hydrocarbon accumulation in the postrift traps.

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Section: Timing Of Hydrocarbon Generation and Expulsionmentioning

confidence: 92%

Section: Kerogen Typementioning

confidence: 96%

Section: Kerogen Typementioning

confidence: 99%

Section: Formation Tops and Lithologiesmentioning

confidence: 99%

See 2 more Smart Citations

Reconstruction of the Cenozoic History of Hydrocarbon Fluids from Rifting Stage to Passive Continental Margin Stage in the Huizhou Sag, the Pearl River Mouth Basin

Jiang²,

Jiang

et al. 2017

Geofluids

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“…4a and 5). The C 30 4-methylsterane is a distinctive constituent of the Eocene Wenchang Formation lacustrine sediments in the Pearl River Mouth Basin (Robison et al, 1998;Zhu et al, 1999;Huang et al, 2003) and its biological precursors may be related to certain dinoflagellates thriving in freshwater lakes (Brassell et al, 1988;Goodwin et al, 1988). According to an investigation made by Fu et al (1985) on the Paleocene-Eocene oil shale from the onshore Maoming Basin, dinoflagellates with high hydrocarbon source potentials occur dominantly in deep freshwater lacustrine facies.…”

Section: Group I Oilmentioning

confidence: 99%

Oil families and their source rocks in the Weixinan Sub-basin, Beibuwan Basin, South China Sea

Huang

Xiao

Cai

et al. 2011

Organic Geochemistry

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Petrography and geochemistry of Oligocene to Lower Miocene sandstones in the Baiyun Sag, Pearl River Mouth Basin, South China Sea: Provenance, source area weathering, and tectonic setting

Chen

et al. 2018

Geological Journal

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There is a controversy regarding the source area and weathering intensity of Oligocene to Lower Miocene sediments in the Baiyun Sag of the Pearl River Mouth Basin.Detrital modes, geochemistry, heavy mineral data, and detrital zircon U-Pb ages were analysed to understand the provenance, source area weathering, and tectonic setting of Oligocene to Lower Miocene sandstones in the Baiyun Sag. Petrographic data reveal that the sandstones were derived from a recycled orogen. With increasing transport distance, sediment maturity increased correspondingly. The Oligocene to Lower Miocene sandstones in the Baiyun Sag have low compositional maturity and have experienced low to moderate weathering. The sediments of the Zhuhai Formation have experienced relatively strong weathering intensity compared with those of the Enping and lower Zhujiang formations. Due to low degree of illitization and differences in the geochemical compositions of the sediments, the continental island arc data from different boreholes in the Baiyun Sag are more irregularly distributed in the A-CN-K plot. The modal composition (e.g., quartz, feldspar, and lithic fragments) and geochemical indices (Al 2 O 3 /TiO 2 ratio; Al 2 O 3 -TiO 2 diagram; discriminant F1-F2 diagram; Eu/Eu*, La/Sc, La/Co, Th/Sc, and Th/Co ratios; Hf-La/Th and La/Sc-Co/Th diagrams; and rare earth element patterns) indicate that the sediments in the Baiyun Sag are mainly derived from felsic source rocks. Although the uplift around the Baiyun Sag includes multistage magmatism and basic rocks, it has little influence on the sediment in the depression, and no sediments were transported by the Han River to the Baiyun Sag. Geochemical data and detrital zircon U-Pb ages suggest that the Pearl River was formed in the Early Oligocene and became the main source for the sediments in this area. The river carried felsic material from the South China Coast forming a large delta on the northern slope of the Baiyun Sag. The ratios of Eu/Eu*, La/Sc, La/ Co, Th/Sc and Th/Co, and heavy mineral data indicate that the sediments transported by the Pearl River to the Baiyun Sag were changed from the arc-dominated coastal zone to the interior of the South China Block during the Late Oligocene to Early Miocene and even reached the south-eastern margin of the Tibetan Plateau (West Yunnan Plateau). The La-Th-Sc and Th-Sc-Zr/10 diagrams suggest that the provenance of these sandstones is evolved continental island arc or an active continental margin setting.

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Petroleum generation, migration, and entrapment in the Zhu 1 depression, Pearl River Mouth basin, South China Sea

Cited by 39 publications

References 14 publications

Reconstruction of the Cenozoic History of Hydrocarbon Fluids from Rifting Stage to Passive Continental Margin Stage in the Huizhou Sag, the Pearl River Mouth Basin

Reconstruction of the Cenozoic History of Hydrocarbon Fluids from Rifting Stage to Passive Continental Margin Stage in the Huizhou Sag, the Pearl River Mouth Basin

Oil families and their source rocks in the Weixinan Sub-basin, Beibuwan Basin, South China Sea

Petrography and geochemistry of Oligocene to Lower Miocene sandstones in the Baiyun Sag, Pearl River Mouth Basin, South China Sea: Provenance, source area weathering, and tectonic setting

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