地学前缘 ›› 2023, Vol. 30 ›› Issue (3): 14-27.DOI: 10.13745/j.esf.sf.2022.5.41
孟康1(), 邵德勇1, 张六六2, 李立武3, 张瑜1, 罗欢2, 宋辉1, 张同伟4,*(
)
收稿日期:
2022-04-02
修回日期:
2022-05-10
出版日期:
2023-05-25
发布日期:
2023-04-27
通信作者:
张同伟
作者简介:
孟 康(1994—),男,博士研究生,主要从事非常规页岩油气研究。E-mail: mengkang17@mails.ucas.ac.cn
基金资助:
MENG Kang1(), SHAO Deyong1, ZHANG Liuliu2, LI Liwu3, ZHANG Yu1, LUO Huan2, SONG Hui1, ZHANG Tongwei4,*(
)
Received:
2022-04-02
Revised:
2022-05-10
Online:
2023-05-25
Published:
2023-04-27
Contact:
*张同伟(1965—),男,教授,博士生导师,主要从事石油、天然气地质地球化学及成藏地球化学研究工作。 E-mail: 摘要:
本文选取鄂西宜昌地区流溪ZK003井水井沱组页岩岩心样品13块,开展破碎气测试分析,并结合TOC含量、矿物组成含量以及邻近地区高氮气井—秭地1井的解吸气特征,综合探讨鄂西宜昌地区寒武系页岩气中氮气成因和富集机理。结果表明,研究区水井沱组页岩样品破碎气含量为1.45~14.75 μL.STP/g,变化大,主要受控于页岩中碳酸盐矿物丰度;破碎气以氮气和甲烷为主,相对含量分别为7.92%~86.27%和10.10%~90.88%,且氮气含量明显受控于页岩中TOC含量和黏土矿物含量,并与页岩破碎气含量呈良好的负相关关系。破碎气主要保存在方解石、白云石、黏土矿物及有机质封闭孔隙中,高—过成熟阶段有机质中氮和铵基黏土矿物中氮的释放是水井沱组富有机质页岩中氮气的主要来源。此外,持续性构造抬升剥蚀等地质过程不仅可能造成页岩气散失,还会导致氮气的相对富集。结合我国南方不同地区古生界海相页岩气中氮气含量和氮同位素组成特征的对比分析发现,寒武系页岩气中氮气含量(2.69%~98.92%)远高于下志留统龙马溪组页岩气(0.01%~9.30%)。鄂西宜昌地区水井沱组页岩气中氮气δ15NN2相较于其他地区明显偏重(Δ15NN2=1.5‰~12.7‰),可能与铵基黏土矿物高温热裂解成因氮气有关。
中图分类号:
孟康, 邵德勇, 张六六, 李立武, 张瑜, 罗欢, 宋辉, 张同伟. 鄂西宜昌地区寒武系水井沱组页岩破碎气地球化学特征及其对页岩含气性的指示意义[J]. 地学前缘, 2023, 30(3): 14-27.
MENG Kang, SHAO Deyong, ZHANG Liuliu, LI Liwu, ZHANG Yu, LUO Huan, SONG Hui, ZHANG Tongwei. Geochemical characteristics of residual gas released from crushed shale from the Shuijingtuo Formation in Yichang, western Hubei—indication for gas-bearing capacity of shale[J]. Earth Science Frontiers, 2023, 30(3): 14-27.
图1 宜昌地区构造简图(a)和流溪ZK003井岩性柱状图(b) (构造简图据文献[10]修改) 1—第四系;2—古-新近系;3—白垩系;4—侏罗系;5—三叠系;6—泥盆系—二叠系;7—志留系;8—寒武系—奥陶系;9—南华系—震旦系;10—元古宇;11—主要断裂;12—推测断裂;13—构造边界;14—基底;15—页岩气井;16—采样点。
Fig.1 (a) Simplified geological map of the Yichang area (modified after [10]) showing the location of sampling sites, and (b) lithologic column of well Liuxi ZK003
图3 渝东南地区酉阳剖面牛蹄塘组页岩破碎气平行实验气体组分及含量对比
Fig.3 Comparison of relative abundances (b) and contents (b) of gas components in residual gas from four parallel degassing experiments on crushed shales from the Niutitang Formation, Youyang section, southeastern Chongqing
图5 宜昌地区流溪ZK003井水井沱组页岩破碎气校正后气体组分及含量
Fig.5 Contents (a) and relative abundances (b) of gas components in residual gas released from crushed shale samples after corrections for atmospheric and water contamination
图10 宜昌地区流溪ZK003井和秭地1井水井沱组页岩气中N2含量与破碎气量/解吸气量相关关系
Fig.10 Correlation between N2 content and residual/desorbed gas contents in the Shuijingtuo shale formation of wells Liuxi ZK003 (blue dot) and Zidi 1 (orange dot), Yichang area
图11 我国南方下古生界典型海相页岩气井分布(a)及氮气相对含量对比(b) (图a底图据文献[51]修改)
Fig.11 (a) Distribution of typical Lower Paleozoic marine shale gas wells in southern China (basemap modified from [51]), and (b) comparison of nitrogen contents in shale gas from different regions
图12 我国南方下古生界海相页岩气中氮气成因鉴别(底图参数来源于文献[58])
Fig.12 Identification of nitrogen origin for Lower Paleozoic marine shale gas in southern China (basemap parameters modified after [58])
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