鄂西宜昌地区下古生界五峰组-龙马溪组页岩气储层发育特征与勘探潜力

doi:10.11743/ogg20210110

Abstract

Abstract:

During the past few years, several shale gas discoveries were made in the Upper Ordovician Wufeng Formation and Lower Silurian Longmaxi Formation in Yichang of western Hubei Province, China.The shale gas potential of the formations was then explored by combining the previous studies with updated analyses of drilling data and outcrops, geophysical information and testing results.A summary of the development characteristics, reservoir distribution and resource potential of the formations shows that the targeted dark, organic-rich rocks at the lower part of the formations have high quartz content (more than 50% on average) and TOC(2.47% on average), and high maturity (R_o of more than 2% in general), low porosity (less than 5% in general), extra-low permeability (0.19×10^-3 μm² on average), and relatively high gas content (2.0 m³/t on average).Quality reservoirs are mostly distributed in the lower part (about 11 m thick) of the black rocks and can be corresponded to the WF2-WF3 Katian graptolite zone and LM2-LM3 Rhuddanian graptolite zone.The reservoirs are thinner than high-quality reservoirs in Jiaoshiba and Changning areas, Sichuan Province.However, judging by their preservation conditions and economy, we propose that the rocks in the slope of eastern Yichang with their shallower burial depth, relatively better preservation conditions as well as a geological reserve of over 1 200×10⁸ m³, are worthy of further exploration.

Key words: exploration potential, shale gas, reservoir characteristics, Wufeng Formation, Longmaxi Formation, Yichang area

CLC Number:

TE122.2

Quansheng Cai, Xiaohong Chen, Guotao Zhang, Baomin Zhang, Jing Han, Lin Chen, Peijun Li, Yangui Li. Characteristics and exploration potential of the Wufeng-Longmaxi shale gas reservoirs of Lower Paleozoic in Yichang area, western Hubei Province, China[J]. Oil & Gas Geology, 2021, 42(1): 107-123.

Figures/Tables 17

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地层			矿物含量/%
地层			石英	长石	碳酸盐矿物	粘土矿物
统	组	阶	最小~最大	最小~最大	最小~最大	最小~最大
统	组	阶	平均	平均	平均	平均
下志留统	龙马溪组	埃隆阶	18.26~68.83	3.14~18.13	0~16.19	7.54~75.13
		埃隆阶	40.41	7.62	3.23	45.84
		鲁丹阶	44.45~93.78	1.74~15.6	0~5.46	0~46.28
		鲁丹阶	72.26	8.43	1.43	18.31
上奥陶统	五峰组	赫南特阶	42.5~86.01	4.17~11.85	0~8.13	9.82~32.67
		赫南特阶	68.43	7.79	2.25	20.45
		凯迪阶	34.56~100	0~11.62	0~4.28	0~53.12
		凯迪阶	73.54	5.74	1.56	19.46

剖面位置	层位	样品个数	地层TOC/%
剖面位置	层位	样品个数	分布范围	平均值
鄂宜页2井	五峰组-龙马溪组	30	0.32~5.53	2.41
鄂宜页3井	五峰组-龙马溪组	16	0.36~5.13	2.15
荷花横石	龙马溪组	18	0.93~6.38	2.90

储层品质	TOC/%	脆性指数/%	含气性/(m³·t^-1)	沉积环境
Ⅰ类(优质储层)	>2.5	>50	>2	深水硅质陆棚
Ⅱ类(次优储层)	1.5~2.5	40~50	1~2	深水泥质陆棚
Ⅲ类(差储层)	0.5~1.5	30~40	0.5~1	深/浅水泥质陆棚
Ⅳ类(非储层)	< 0.5	< 30	< 0.5	浅水泥质陆棚

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Characteristics and exploration potential of the Wufeng-Longmaxi shale gas reservoirs of Lower Paleozoic in Yichang area, western Hubei Province, China

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