Characteristics and research progress of Middle-Upper Permian marine shale reservoirs in middle Yangtze region

KONG WEILIANG; LIU WEN; CHEN LEI; YU ZHENXIANG; QU TIANQUAN; ZHANG QIN; WU SHUAICAI; XIONG MIN; CAI GUANGYIN; GAO WANLI; QIU ZHEN

doi:10.13809/j.cnki.cn32-1825/te.2024572

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Characteristics and research progress of Middle-Upper Permian marine shale reservoirs in middle Yangtze region
Vol. 16, Issue 2, Pages: 315-328(2026)
Received：06 January 2025，

Published：26 March 2026
DOI： 10.13809/j.cnki.cn32-1825/te.2024572
稿件说明：

移动端阅览

孔维亮, 刘雯, 陈雷, 等. 中扬子地区中上二叠统海相页岩储层特征及研究进展[J]. 油气藏评价与开发, 2026, 16(2): 315-328. DOI： 10.13809/j.cnki.cn32-1825/te.2024572.

KONG Weiliang, LIU Wen, CHEN Lei, et al. Characteristics and research progress of Middle-Upper Permian marine shale reservoirs in middle Yangtze region[J]. Petroleum Reservoir Evaluation and Development, 2026, 16(2): 315-328. DOI： 10.13809/j.cnki.cn32-1825/te.2024572.

摘要

中扬子地区中上二叠统海相页岩层系是中国页岩气勘探开发的重要接替领域，资源潜力巨大，但其储层发育具有复杂性。基于部分学者的研究成果，对中扬子地区中上二叠统孤峰组、吴家坪组和大隆组三套页岩层系的储层特征和研究进展进行了系统总结。研究结果显示：①三套页岩层系均具有高TOC（总有机碳）含量、热演化程度适中和纳米孔隙发育的特征，表现出较好的储层品质。孤峰组页岩TOC含量最高，干酪根类型以Ⅰ型为主；吴家坪组与大隆组TOC含量次之，干酪根均以Ⅱ型为主。岩相类型方面，孤峰组与大隆组以硅质页岩为主导，吴家坪组则因沉积环境多变而岩相复杂、非均质性显著。孔隙结构方面，孤峰组页岩孔隙跨度大，从纳米级至微米级均有发育；吴家坪组与大隆组页岩则以微孔和介孔为主。②三套页岩储层具有复杂性，表现为岩相类型多样、孔隙类型多样、强烈的多尺度非均质性特征。③针对中扬子地区中上二叠统海相页岩储层研究总体较弱，建议开展露头-岩心-实验多尺度结合的储层定量表征，推动学科交叉，引入人工智能与大数据分析技术等手段进行研究，构建适用于本区地质特点的页岩储层综合评价体系，开展“甜点”段与“甜点”区的分级优选与评价，从而为中扬子地区中上二叠统海相页岩气的规模性勘探和有效开发提供坚实的理论支撑与决策指导。

Abstract

The Middle-Upper Permian marine shale formations in the middle Yangtze region are an important replacement field for shale gas exploration and development in China

with great resource potential. However

their reservoir development is complex. Based on previous studies

this study systematically summarizes the reservoir characteristics and research progress of three sets of shale formations from the Middle-Upper Permian: Gufeng

Wujiaping

and Dalong Formations in the middle Yangtze region. The results show that: (1) All three sets of shale formations are characterized by high total organic carbon (TOC) contents

moderate thermal maturity

and well-developed nanopores

exhibiting favorable reservoir quality. Among them

the Gufeng Formation shale exhibits the highest TOC content

with kerogen dominated by Type I. The Wujiaping and Dalong Formations show relatively lower TOC contents

and their kerogen is mainly Type II. In terms of lithofacies

the Gufeng and Dalong Formations are dominated by siliceous shale

whereas the Wujiaping Formation exhibits complex lithofacies and significant heterogeneity due to variable depositional environments. In terms of pore structure

the Gufeng Formation shale displays a wide pore-size range

with development from the nanoscale to the microscale

whereas the Wujiaping and Dalong Formation shales are dominated by micropores and mesopores. (2) The three sets of shale reservoirs are complex

characterized by diverse lithofacies

multiple pore types

and strong multi-scale heterogeneity. (3) Overall research on the Middle-Upper Permian marine shale reservoirs in the middle Yangtze region remains relatively limited. Therefore

it is recommended to carry out quantitative reservoir characterization through integrated multi-scale analysis of outcrops

cores

and experiments

promote interdisciplinary collaboration

introduce techniques such as artificial intelligence and big data analysis

establish a comprehensive shale reservoir evaluation system tailored to the geological characteristics of this region

and conduct graded optimization and evaluation of “sweet spot” intervals and areas

thereby providing solid theoretical support and decision-making guidance for large-scale exploration and effective development of Middle-Upper Permian marine shale gas in the middle Yangtze region.

关键词

Keywords

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Application of large field splicing scanning electron microscopy on quantitatively evaluation of shale pore structure: A case study of Longmaxi Formation reservoir in deep western Chongqing Block to southern Sichuan