下扬子地区萍乐坳陷二叠系乐平组煤系页岩储层特征及勘探潜力

doi:10.12108/yxyqc.20260109

Lithologic Reservoirs ›› 2026, Vol. 38 ›› Issue (1): 100-114.doi: 10.12108/yxyqc.20260109

• PETROLEUM EXPLORATION • Previous Articles

Coal measure shale reservoir characteristics and exploration potential of Permian Leping Formation in Pingle Depression of Lower Yangtze region

XIAO Fuqiang¹^,²^,³(), XIAO Weidong², JIANG Zhidong², GAO Lei³, ZHAO Zhengwei³, PAN Xiaofei³, CHEN Fugui², ZOU Yongjun¹^,²()

¹ Jiangxi Key Laboratory of Critical Mineral Resources Exploration and Development， Nanchang 330001， China
² Jiangxi Coalfield Geological Survey Institute， Nanchang 330001， China
³ Coalfield Geological Center of Xinjiang Uygur Autonomous Region Geological Bureau， Urumqi 830000， China

Received:2025-07-03 Revised:2025-08-28 Online:2026-01-01 Published:2026-01-23
Contact: ZOU Yongjun E-mail:xiaofq1218@163.com;158276952@qq.com

Abstract

Abstract:

Upper Permian Leping Formation of Pingle Depression is an important coal measure strata in south China， with favorable conditions for the formation of coal measure shale gas reservoirs. Mineral composition， organic geochemical characteristics， pore types， pore structure， and influencing factors of pore development of Leping Formation coal measure shale reservoir in the west section of Pingle Depression were studied through testing methods， such as thin section identification， X-ray diffraction， organic geochemical analysis， scanning electron microscopy， high-pressure mercury intrusion， low-temperature N₂ and CO₂ adsorption， and exploration prospects of shale gas were explored. The results show that：（1） The coal measure shale of Permian Leping Formation in Pingle Depression of Lower Yangtze region is mainly composed of detrital grain， mud and charcoal， with high content of brittle minerals and good fracability. TOC content of coal measures shale is relatively high， kerogen types are Ⅱ₁ and Ⅲ， and thermal evolution reaches high maturity to over maturity stage. （2） The porosity of shale is mostly 3.75%-4.67%， and the permeability is 0.006 2-0.009 1 mD， with low-porosity and low-permeability characteristics. The pore types are mainly intergranular pores， intragranular pores and microcracks， with fewer organic pores. （3） Average pore volume of shale is 0.020 2 cm³/g， average specific surface area is 15.02 m²/g. Mesopores contribute the most to the total pore volume， while micropores contribute the most to the total specific surface area. The pore size is characterized by “multi-peak” distribution. （4） Quartz and carbonate minerals can promote the development of mesopore and inhibit the development of micropores. The increase of quartz content reduces pore heterogeneity， and the increase of carbonate minerals improves pore heterogeneity. Clay minerals and organic matter can promote micropores development and inhibit mesopore development. Clay minerals increase pore heterogeneity， while organic matter strengthens pore homogeneity. （5） The coal measure shale in the study area exhibit good fracability， hydrocarbon generation potential， reservoir capacity， and with good preservation conditions. Yang-qiao， Fengcheng， Fujiaxu， and Taiyangxu are selected as favorable areas for coal measures shale gas exploration， with Fengcheng area being the primary target for further exploration.

Key words: coal measure shale gas, low-porosity and low-permeability, brittle mineral, heterogeneity, Leping Formation, Permian, Pingle Depression, Lower Yangtze region

CLC Number:

TE121.31

XIAO Fuqiang, XIAO Weidong, JIANG Zhidong, GAO Lei, ZHAO Zhengwei, PAN Xiaofei, CHEN Fugui, ZOU Yongjun. Coal measure shale reservoir characteristics and exploration potential of Permian Leping Formation in Pingle Depression of Lower Yangtze region[J].Lithologic Reservoirs, 2026, 38(1): 100-114.

Figures/Tables 15

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TRENDMD:

井名	深度/ m	w（腐泥组）/%	w（壳质组）/%	w（镜质组）/%	w（惰质组）/%	有机质类型
DK01	528	8	90	2	0	Ⅱ₁
	544	3	96	1	0	Ⅱ₁
	567	5	92	2	1	Ⅱ₁
	589	3	97	0	0	Ⅱ₁
	613	12	86	2	0	Ⅱ₁
QJ01	467	4	24	50	22	Ⅲ
	473	10	64	20	6	Ⅱ₂
	573	9	66	18	7	Ⅱ₂
	621	8	56	31	5	Ⅱ₂

样品编号	平均孔径/nm	总孔容/ （cm³·g^-1）	总比表面积/ （m²·g^-1）	孔容/（cm³·g^-1）			比表面积/（m²·g^-1）
样品编号	平均孔径/nm	总孔容/ （cm³·g^-1）	总比表面积/ （m²·g^-1）	微孔	介孔	宏孔	微孔	介孔	宏孔
DKYP12	23.31	0.019 1	13.03	0.002 2	0.012 3	0.004 6	7.05	5.37	0.61
DKYP24	32.79	0.021 6	15.65	0.002 9	0.012 8	0.005 9	9.43	5.69	0.53
QJYP16	29.88	0.022 1	12.69	0.002 0	0.013 3	0.006 8	6.64	5.48	0.57
QJYP25	26.76	0.018 0	18.52	0.004 3	0.009 9	0.003 9	13.81	4.22	0.49

地区	地层	沉积类型	TOC/%	R_o/%	干酪根类型	w（脆性矿物）/%	孔隙度/%	v（含气）/（m³·t^-1）	页岩厚度/m
四川盆地涪陵区块^[49]	龙马溪组	海相	1.50~6.00	2.65	Ⅰ	50.0~80.0	4.87	1.30~6.30	80~100
鄂尔多斯盆地^[6]	太原组	海陆过渡相	0.50~17.00	1.60~2.70	Ⅱ₂，Ⅲ	28.0~80.0	1.25~5.80	1.40~5.70	10~70
黔北煤田^[21]	龙潭组	海陆过渡相	0.56~9.58	1.99~3.26	Ⅲ	6.0~87.0	1.20~12.10	0.20~2.70	48
松辽盆地^[50]	营城组	陆相	0.95~4.33	0.98~2.30	Ⅱ—Ⅲ	3.5~94.8	2.04~7.66	0.85~2.06	40~100
萍乐坳陷西段	乐平组	海陆过渡相	0.33~8.61	1.26~3.79	Ⅱ₁，Ⅲ	44.5~67.6	2.70~7.90	0.10~2.10	100

Coal measure shale reservoir characteristics and exploration potential of Permian Leping Formation in Pingle Depression of Lower Yangtze region

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