Sedimentology and geochemistry of Eocene source rocks in the east China sea: Controls on hydrocarbon generation and source rock preservation

Qu, Tong; Huang, Zhilong; Li, Tianjun; Yang, Yizhuo; Wang, Boran; Wang, Rui

doi:10.1016/j.jseaes.2023.105770

Cited by 1 publication

(3 citation statements)

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“…The main hydrocarbon source rock is previously suggested the Middle-Upper Eocene Pinghu Formation 11,24 , which is a transitional marine-continental source rock with good thermal maturity (Fig. 2).…”

Section: Geological Settingmentioning

confidence: 92%

“…The source rock thickness of the Pinghu Formation in the Xihu Depression is large, with a wide distribution area and deep burial depth. Their organic matter abundance and type of hydrocarbon source rock are high with great potential to be one of the major source rocks 1,11,17 . Based on a comprehensive analysis of organic geochemical characteristics, petroleum system correlation, basin formation history, sedimentary evolution and depositional environments, this study suggests that the Pinghu Formation has high hydrocarbon generation potential in this deep area (> 3500 m) within Xihu Depression.…”

Section: Geological Settingmentioning

confidence: 99%

“…The source rocks of the Xihu Depression, located in the northern part of the ECSB, are considered to have developed in the Pinghu, Huagang and Longjing formations 3,10,11 . 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 .…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Geological Settingmentioning

confidence: 92%

Section: Geological Settingmentioning

confidence: 99%