Hydrocarbon generation potential, geochemical characteristics, and accumulation contribution of coal-bearing source rocks in the Xihu Sag, East China Sea Shelf Basin

Quan, Yongbin; Chen, Zhongyun; Jiang, Yiming; Diao, Hui; Xie, Xinong; Lu, Yongchao; Du, Xuebin; Liu, Xiaofeng

doi:10.1016/j.marpetgeo.2021.105465

Cited by 15 publications

(4 citation statements)

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“…Some biomarker parameters may converge and lose their conventional indicative function under high‐maturity conditions (Liang et al, 2009; Yang et al, 2012). However, based on simulation experiments, Zhang et al (2021) found that the C‐27, C‐28, and C‐29 regular sterane ternary diagrams were still effective in indicating organic matter sources at high evolutionary stages and inherited the genetic characteristics of the original organic matter.…”

Section: Resultsmentioning

confidence: 99%

Reconstruction of palaeo‐oil reservoirs in the ultra‐deep and over‐mature Sinian Dengying Formation of the Central Sichuan Basin: Insights from basin and petroleum system modelling

Li,

Liu,

Song

et al. 2024

Geological Journal

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Ultra‐deep Sinian carbonate rocks are rich in natural gas, and the Deng‐4 Member of the Central Sichuan Basin has been shown to have an extremely high degree of thermal evolution. They are characterized by dry gas produced due to the thermal cracking of palaeo‐oil reservoirs (PORs). The distribution of PORs as materials for the formation of cracked gas reservoirs remains unclear. The complex multistage evolution process and limited drilling data make it challenging to precisely and systematically recover a range of PORs. Based on basin and petroleum system modelling (BPSM), the bottom‐up migration and accumulation method was used to investigate the distribution of PORs. Research shows that the PORs in the Sinian Deng‐4 Member were mainly formed in the Early–Middle Triassic under the mixed contribution of Cambrian and Sinian source rocks, and the coupling of palaeostructural and trap settings controlled its accumulation. Generally, the distribution of PORs can be divided into two categories: one is located at the core of the uplift zone and is controlled by structural‐stratigraphic composite traps, whereas the other is controlled by a series of lithologic traps formed in the slope area. Sensitivity analysis showed that the distribution patterns of the PORs were mostly related to the facies conditions (physical characteristics) of the reservoirs. The widely distributed PORs provide necessary and sufficient material conditions for the formation of cracked Sinian gas reservoirs in the Central Sichuan Basin, and the North Slope area has great potential for natural gas exploration in the future.

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Section: Resultsmentioning

confidence: 99%

Reconstruction of palaeo‐oil reservoirs in the ultra‐deep and over‐mature Sinian Dengying Formation of the Central Sichuan Basin: Insights from basin and petroleum system modelling

Li,

Liu,

Song

et al. 2024

Geological Journal

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“…This is of great signi cance, especially in regions with limited exploration activities, because it provides additional geochemical evidence for further comparisons and analyses. Moreover, previous studies have not de nitively established which constituent of the Pinghu Formation serves as the predominant hydrocarbon source rock [1][2][3][15][16][17]20 . However, there is a prevailing consensus that coal plays this role.…”

Section: Discussionmentioning

confidence: 99%

“…The Pinghu Formation is widely recognized as a gas-rich interval 1,12 , which is renowned for its rich hydrocarbon resources, with estimated oil and gas production of approximately 2.3×10 9 t and 2.377×10 12 m 3 , respectively 13 . Its coalbearing rocks are the primary source rock of the Xihu Depression [13][14][15][16] , which are widely distributed and have a high thickness 1,3,17 .…”

Section: Introductionmentioning

confidence: 99%

Geochemical Evaluation of Pinghu Formation Source Rocks for Hydrocarbon Potential in East China Sea of Xihu Depression

Cui,

Taiwo,

Aaron

2023

Preprint

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The Xihu Depression in the East China Sea Basin (ECSB) is a potential petroleum accumulation area, but its Pinghu Formation is poorly understood and requires more geochemical evidence. This study aims to evaluate the organic matter abundance and hydrocarbon potential of source rocks of typical lithologies of mudstone, carbonaceous mudstone and coal. The results show that mudstone source rocks have a broad total organic carbon (TOC) range, with nearly 35% exceeding 1.0% and averaging 1.03%, indicating relatively high organic content. Carbonaceous mudstone and coal and samples exhibit high TOC, ranging from 5.0% to 72.9% and 31.7% to 72.9%, and with average 12.6% and 51.3%, suggesting significant hydrocarbon generation potential. This formation exhibits high organic richness, especially in coal and carbonaceous mudstone, comparable to top source rocks in other Chinese land basins. This supports that mudstone source rocks have a low organic matter abundance and moderate hydrocarbon potential due to their thickness, whereas carbonaceous mudstone and coal showcase higher organic richness with significant hydrocarbon potential. This study provides new geochemical data and insights on the Pinghu Formation and its exploration potential, particularly by enhancing the previously overlooked but noteworthy evidence related to mudstone.

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“…Extensive research has confirmed the petroleum generation potential of coal-bearing strata. − Coal-bearing source rocks refer to coal and associated carbonaceous/dark mudstone that can generate hydrocarbon. Commercial quantities of oil and gas have been discovered in the Jurassic coal-bearing mudstone sequences of NW China sedimentary basins, including the Tarim Basin, Qaidam Basin, Junggar Basin, Ordos Basin, and Turpan Basin. − Coal-bearing mudstones not only are important source rocks for unconventional reservoirs but also record valuable information on the paleoenvironment and paleoclimate, − receiving great attention in recent years. − …”

Section: Introductionmentioning

confidence: 99%

Geochemical Characteristics of the Middle Jurassic Coal-Bearing Mudstones in the Dameigou Area (Qaidam Basin, NW China): Implications for Paleoclimate, Paleoenvironment, and Organic Matter Accumulation

Zhou,

Sun,

Yang

et al. 2023

ACS Omega

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The Qaidam Basin is a prominent oil and gas exploration and production base of NW China’s Jurassic coal-bearing strata. Coal-bearing mudstones are important source rocks for unconventional reservoirs and can record valuable paleoenvironment and paleoclimate information. Here, geochemical analysis including total organic carbon (TOC), total sulfur, organic carbon isotopic composition, rock pyrolysis, X-ray diffraction, and major and trace elements were carried out on mudstone samples from the Middle Jurassic coal-bearing strata of the Dameigou section in the Qaidam Basin to reveal the paleoclimatic and paleoenvironmental conditions during the deposition of the strata and their controls on organic matter accumulation. Results show that the Middle Jurassic Dameigou and Shimengou formations include three significant stages based on their average TOC values of (3.32%, Stage I; 0.87%, Stage II; and 4.42%, Stage III) from the bottom to the top. The organic matter in mudstones in Stages I and II are mainly derived from terrestrial higher plants, while the organic matter has mixed sources of higher plant debris and lower aquatic organisms in Stage III. Paleoclimate parameters indicate that the mudstones in Stage I were deposited under humid and warm conditions, while the climate in Stage II changed to semiarid and warm conditions before turning dry and hot in Stage III. The varying paleoenvironmental characteristics under different paleoclimatic conditions have also been reconstructed. Our results suggest that the accumulation of organic matter in Stages I and II was primarily controlled by redox conditions, while paleoproductivity is the major controlling factor for organic matter accumulation in Stage III.

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Hydrocarbon generation potential, geochemical characteristics, and accumulation contribution of coal-bearing source rocks in the Xihu Sag, East China Sea Shelf Basin

Cited by 15 publications

References 50 publications

Reconstruction of palaeo‐oil reservoirs in the ultra‐deep and over‐mature Sinian Dengying Formation of the Central Sichuan Basin: Insights from basin and petroleum system modelling

Reconstruction of palaeo‐oil reservoirs in the ultra‐deep and over‐mature Sinian Dengying Formation of the Central Sichuan Basin: Insights from basin and petroleum system modelling

Geochemical Evaluation of Pinghu Formation Source Rocks for Hydrocarbon Potential in East China Sea of Xihu Depression

Geochemical Characteristics of the Middle Jurassic Coal-Bearing Mudstones in the Dameigou Area (Qaidam Basin, NW China): Implications for Paleoclimate, Paleoenvironment, and Organic Matter Accumulation

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