高校地质学报2024，Vol.30Issue(2)：231-240,10.DOI:10.16108/j.issn1006-7493.2022097
四川盆地及其周缘五峰组—龙马溪组页岩物源及构造环境分析
Provenance and Tectonic Setting Analysis of the Wufeng-Longmaxi Formation Shale in the Sichuan Basin and Its Surrounding Area
彭浩 1陈雷 2胡云鹏 1卢畅 3恒德 1文冉 1谭秀成 2秦何星2
作者信息
- 1. 四川长宁天然气开发有限责任公司,成都 610051
- 2. 天然气地质四川省重点实验室,成都 610500||中国石油集团 碳酸盐岩储层重点实验室西南石油大学研究分室,成都 610500
- 3. 天然气地质四川省重点实验室,成都 610500||中海石油(中国)有限公司深圳分公司,深圳 518000
- 折叠
摘要
Abstract
The Wufeng-Longmaxi Formation shales show great variations in sedimentological,mineralogical and geochemical characteristics across the Sichuan Basin and its surrounding areas.Provence and sources are the basis in determining composition,mineralogy,and brittleness of shale.In this paper,we analyze the geochemical characteristics,source rock properties and tectonic setting of the Wufeng-Longmaxi shale in the Sichuan Basin and its surrounding areas based on major elements,trace elements,and rare earth elements data.The results show that the main components of the Wufeng-Longmaxi shale are SiO2,CaO and Al2O3 in the Sichuan Basin and its surrounding areas.From the southwest to south-southeast-northeast Sichuan,the SiO2 content in the Wufeng-Longmaxi Formation shale increases gradually,while the CaO content decreases gradually.The La/Yb-REE diagram shows that the source rocks of the Wufeng-Longmaxi Formation shale have certain variations in different areas of Sichuan Basin and its surrounding areas.The source rocks of the Wufeng-Longmaxi Formation shales are similar in southwest Sichuan and South Sichuan,mainly consisting of alkaline basalt,sedimentary rocks and granites.The shale source rocks of southeast Sichuan are mainly composed of granite and alkaline basalt,while the shale source rocks of northeast Sichuan are mainly composed of sedimentary rocks and granites.The ICV index analyses reveal that the source of the Wufeng-Longmaxi shales in southwest and south Sichuan is a result of rapid deposition of the first cycle of the near source,while the Wufeng-Longmaxi shales in southeast and northeast Sichuan have undergone recycling or strong chemical weathering.The analyses of Sc/Cr-La/Y diagram and other related parameters indicate that the Wufeng-Longmaxi Formation shale in the Sichuan Basin and its surrounding areas was deposited in a passive continental margin.关键词
页岩/五峰组—龙马溪组/物源分析/构造背景/四川盆地Key words
Shale/Wufeng-Longmaxi Formation/provenance analysis/tectonic setting/Sichuan Basin分类
天文与地球科学引用本文复制引用
彭浩,陈雷,胡云鹏,卢畅,恒德,文冉,谭秀成,秦何星..四川盆地及其周缘五峰组—龙马溪组页岩物源及构造环境分析[J].高校地质学报,2024,30(2):231-240,10.
