贵州习水骑龙村奥陶系五峰组—志留系龙马溪组剖面

doi:10.13809/j.cnki.cn32-1825/te.2022.01.002

Abstract

Abstract:

As a systematic study of the Wufeng-Longmaxi Formation was carried out by paleontological comparison, thin section identification, scanning electron microscopy and Nitrogen Adsorption Method in Qilong Village outcrop, Xishui, Guizhou Province, the following main insights are obtained: ① The Wufeng-Longmaxi Formation in Qilong Village outcrop is complete, and is conformable with overlying Silurian Shiniulan Formation and the underlying Ordovician Jiancaogou Formation, with 12 graptolite biozones developed and without unconformity; ② Based on a variety of sedimentary fabric features, six major shale lithofacies in the Wufeng-Longmaxi Formation are determined; ③ The quartz content of the Wufeng Longmaxi Formation decreases, while clay minerals increase gradually from the bottom to the top in Qilong Village outcrop, which shows the content of brittle minerals decreases, and a decrease of fracability of the shale from the bottom to the top; ④ The organic matter types of Wufeng-Longmaxi Formation in Qilong Village outcrop are mainly of type Ⅰ and type Ⅱ₁, and the high TOC shale is mainly distributed in the Wufeng and lower Longmaxi Formation; ⑤ There is relatively low paleoproductivity of the Wufeng-Longmaxi Formation in Qilong Village outcrop. The high quality black shale was deposited in anoxic-dysoxic conditions, and high content of organic matter benefits from the high burial efficiency of organic matter; ⑥ The organic pores of the Wufeng-Longmaxi Formation in Qilong Village outcrop are mainly distributed in Wufeng and lower Longmaxi Formation, while organic pores were not developed in the upper member of Longmaxi Formation or Guanyinqiao member. The abundance of the small pores vertically decreases with stratigraphy upwards and The abundance of the large pore increases with stratigraphy upwards; ⑦ The natural gas adsorption capacity of the Wufeng-Longmaxi Formation in Qilong Village outcrop is a minimum of 1.62 m³/t, a maximum of 2.8 m³/t, and an average value of 2.13 m³/t. This shows that the larger the TOC value is, the stronger the corresponding adsorption capacity will be, and indicates organic matter content plays a decisive role in gas-bearing capacity of organic-rich shales.

Key words: organic matter abundance, pore structure, gas content, Wufeng-Longmaxi Formation, Qilong Village

CLC Number:

TE122

LIU Shugen, RAN Bo, YE Yuehao, WANG Shiyu, YANG Di, LUO Chao, HAN Yuyue, SONG Jinmin, ZHANG Xuan. Outcrop of Ordovician Wufeng Formation-Silurian Longmaxi Formation in Qilong Village, Xishui, Guizhou[J].Reservoir Evaluation and Development, 2022, 12(1): 10-28.

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判别指标		水体溶氧量（mL/L）	标型矿物	黄铁矿矿化度(DOP）	还原态/ 氧化态	微量元素含量	V/(V+Ni)	V/Cr	Ni/Co	U/Th	Au （mg/L）	铀异常
氧亏损环境	缺氧	0.2	原生金属硫化物	0.4~0.7（无H₂S）;大于0.7（含H₂S）	Fe²⁺/Fe³⁺>1	过渡金属、有机硫含量高	>0.85	>4.25	>7.0	>1.25	>12.0	>1
氧亏损环境	贫氧	0.2~2.0	原生金属硫化物	0.4~0.7（无H₂S）;大于0.7（含H₂S）	Fe²⁺/Fe³⁺>1	过渡金属、有机硫含量高	0.85~0.60	2.0~4.25	5.0~7.0	0.75~1.25	5.0~12.0	>1
富氧环境		>2.0	褐铁矿、 Mo氧化物	<0.4	Fe²⁺/Fe³⁺<1	过渡金属含量低	<0.60	<2.0	<5.0	<0.75	<5.0	<1

Outcrop of Ordovician Wufeng Formation-Silurian Longmaxi Formation in Qilong Village, Xishui, Guizhou

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