Lithofacies paleogeography during the depositional period of the Nanhua System Datangpo Formation and its indications for hydrocarbon accumulation in the Middle and Upper Yangtze Region, South China

SONG Teng; LIN Tuo; LI Fei; LI Haohan; WU Hai; DUAN Ke

doi:10.12029/gc20210602004

GEOLOGY IN CHINA > 2025 > Corrected proof > DOI: 10.12029/gc20210602004

Song Teng, Lin Tuo, Li Fei, Li Haohan, Wu Hai, Duan Ke. 2025. Lithofacies paleogeography during the depositional period of the Nanhua System Datangpo Formation and its indications for hydrocarbon accumulation in the Middle and Upper Yangtze Region, South China[J]. Geology in China, 52(2): 615−632. DOI: 10.12029/gc20210602004

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Lithofacies paleogeography during the depositional period of the Nanhua System Datangpo Formation and its indications for hydrocarbon accumulation in the Middle and Upper Yangtze Region, South China

SONG Teng^{1, 2,},
LIN Tuo²,
LI Fei²,
LI Haohan²,
WU Hai¹,
DUAN Ke³

1.
Research Institute of Petroleum Exploration & Development, Beijing 100083, China
2.
China Geological Survey & Oil and Gas Survey, Beijing 100083, China
3.
Hubei Geological Survey, Wuhan 430034, Hubei, China

Funds: Supported by the projects of China Geological Survey (No.DD20230752, No.DD20240048).

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Author Bio:
SONG Teng, male, born in 1988, senior engineer, engaged in shale gas geological survey and regional evaluation; E-mail: songteng@mail.cgs.gov.cn
Received Date: June 01, 2021
Revised Date: March 29, 2022
Available Online: April 07, 2025

Graphical Abstract

Abstract

Abstract

This paper is the result of oil and gas exploration engineering.
Objective
The marine black manganese−bearing carbonaceous shale of the Datangpo Formation, widely distributed in the mid−Neoproterozoic Nanhua strata of the Middle−Upper Yangtze Region, South China, has been extensively studied as a manganese deposit but remains poorly investigated regarding its petroleum geological characteristics. This study systematically analyzes the lithofacies paleogeography of the Datangpo Formation and evaluates its implications for hydrocaron accumulation, providing critical insights for guiding petroleum exploration in the southern China.
Methods
Through field surveys and comprehensive data synthesis of the Datangpo Formation, we systematically evaluated hydrocarbon conditions, source rock geochemistry, and reservoir−caprock assemblage, especially lithofacies and paleogeography. This integrated approach combined individual well log interpretation, multi−well correlation analysis, and lithofacies paleogeographic with advanced analytical techniques including organic geochemical testing, petrophysical characterization, and reservoir evaluation.
Results
The Datangpo Formation developed during an interglacial period, with its depositional architecture constrained by extensional riftdynamics. Sedimentary facies within the formationare classified into two principal types, seven subcategories and multiple microfacies. The sequence comprises a complete transgressive−highstand−regressive cycle. Hydrocarbon−prospective facies are limited shelf subfacies and lagoon subfacies, predominantly occurring in the first member. These intervals exhibitfavorableorganic geochemical index, and constitute potential source rock horizons.
Conclusions
The first member of the Datangpo Formation exhibits significant hydrocarbon−generation potential and viable shale gas prospects. Strategic areas including Songtao, Huayuan, Xiushan, Xiangtan and Hefeng, located at the confluence of Hunan, Chongqing and Guizhou Province, demonstrate favorable geological conditions for shale gas exploitation. This unit serves as a competent source rock capable of forming multiple prospective hydrocarbon reservoir assemblages. Notably, The Xiushan−Songtao−Huayuan sector along the tri−province boundary of Chongqing, Guizhou, and Hunan exhibits optimal source−reservoir coupling configuration, indicating promising targets for conventional petroleum exploration.
- shale gas,
- Neoproterozoic,
- Datangpo Formation,
- lithofacies paleogeography,
- source rock,
- accumulation assemblage,
- oil and gas exploration engineering,
- South China
Highlights
This article elucidated the lithofacies palaeogeography and reservoir forming mechanism of new strata for oil and gas survey through two principal methodologies: (1) The outcrop profiles and borehole data of the Datangpo Formation of the Nanhua System are systematically sorted out, and the sedimentary facies belts with oil and gas resource potential are clarified; (2) The conditions of the hydrocarbon source rocks and shale gas potential of the Datangpo Formation are analyzed, and the direction of oil and gas investigations is pointed out.

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References (61)

References

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Lithofacies paleogeography during the depositional period of the Nanhua System Datangpo Formation and its indications for hydrocarbon accumulation in the Middle and Upper Yangtze Region, South China

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Lithofacies paleogeography during the depositional period of the Nanhua System Datangpo Formation and its indications for hydrocarbon accumulation in the Middle and Upper Yangtze Region, South China

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