川东二叠系龙潭组页岩岩相特征与沉积环境

doi:10.12108/yxyqc.20220214

岩性油气藏 ›› 2022, Vol. 34 ›› Issue (2): 152–162.doi: 10.12108/yxyqc.20220214

• 地质勘探 • 上一篇

川东二叠系龙潭组页岩岩相特征与沉积环境

肖威¹, 张兵¹, 姚永君², 王艳¹, 杨洪宇¹, 杨凯¹

1. 成都理工大学地球勘探与信息技术教育部重点实验室, 成都 610059;
2. 中国石油西南油气田分公司重庆气矿, 重庆 400000

收稿日期:2021-10-08 修回日期:2021-12-20 出版日期:2022-04-01 发布日期:2022-03-14
通讯作者: 张兵(1981-),男,博士,副教授,主要从事储层沉积学的教学和研究工作。Email:zb4819890@qq.com。 E-mail:zb4819890@qq.com
作者简介:肖威(1997-),男,成都理工大学在读硕士研究生,研究方向为页岩气储层沉积学。地址:(610059)四川省成都市成华区二仙桥街道成都理工大学。Email:3221981677@qq.com
基金资助:
国家自然科学基金“东特提斯三江构造带深部结构形态与属性特征研究”（编号：91755215）资助

Lithofacies and sedimentary environment of shale of Permian Longtan Formation in eastern Sichuan Basin

XIAO Wei¹, ZHANG Bing¹, YAO Yongjun², WANG Yan¹, YANG Hongyu¹, YANG Kai¹

1. Key Laboratory of Earth Exploration and Information Technology, Ministry of Education, Chengdu University ofTechnology, Chengdu 610059, China;
2. Chongqing Gas Mine, PetroChina Southwest Oil & Gas FieldCompany, Chongqing 400000, China

Received:2021-10-08 Revised:2021-12-20 Online:2022-04-01 Published:2022-03-14

摘要/Abstract

摘要： 川东地区二叠系龙潭组属于过渡相—海相地层，页岩气勘探前景广阔。根据研究区页岩的矿物学、岩石学特征划分了岩相类型，利用地球化学数据重建了古沉积环境，并探讨了其有机质富集的控制因素，在此基础上建立岩相、有机质富集与沉积环境的耦合关系。研究结果表明：①川东龙潭组页岩主要发育硅质页岩、黏土质硅质混合页岩、黏土质钙质混合页岩和钙质硅质混合页岩等4种岩相，垂向上岩相分布可划分为早期相对富黏土阶段和晚期硅质含量相对较高阶段。②沉积环境分析表明，龙潭组沉积早期海平面低，主要处于氧化—次氧化环境，其U/Th平均为0.42，EF_Mo平均为6.66，V（/V+Ni）平均为0.77，古生产力较低，陆源输入大，硅质来源为陆源搬运；晚期海平面持续上升，主要处于还原环境，其U/Th平均为5.96，EF_Mo平均为148.01，V（/V+Ni）平均为0.79，古生产力高，陆源输入低，有大量生物成因硅富集。③龙潭组沉积时期有机质的富集具有明显的差异性，沉积早期受陆源输入强度和古生产力共同控制，大量陆源高等植物碎屑等被带入，造成其有机碳含量较高；沉积晚期仅受古生产力控制，陆源碎屑供给相对前期减弱，有机质多来源于海洋藻类植物。

关键词: 页岩岩相, 陆源碎屑, 古生产力, 有机质富集, 龙潭组, 二叠系, 川东

Abstract: Permian Longtan Formation in eastern Sichuan Basin belongs to transitional-marine strata, with a broad shale gas exploration prospect. According to the mineralogical and petrological characteristics of shale in the study area, the lithofacies was divided, the paleosedimentary environment was reconstructed by using geochemical data, and the controlling factors of organic matter enrichment were discussed. On this basis, the coupling relationship among lithofacies, organic matter enrichment and sedimentary environment was established. The results show that:(1) The shale of Longtan Formation in eastern Sichuan Basin mainly develops four lithofacies:siliceous shale, clay siliceous mixed shale, clay calcareous mixed shale and calcareous siliceous mixed shale. The vertical distribution of lithofacies can be divided into early relatively clay rich stage and late relatively high siliceous content stage.(2) During the early stage of Longtan Formation, the sea level was low, it was mainly in oxidation-suboxidation environment. The average U/Th is 0.42, the average EF_Mo is 6.66, and the average V(/V+Ni) is 0.77. The paleoproductivity is low and the terrigenous input is large, and the siliceous source was terrigenous transport. During the late stage, the sea level continued to rise, it was mainly in reduction environment. The average U/Th is 5.96, the average EF_Mo is 148.01, and the average V(/V+Ni) is 0.79, with high paleoproductivity and little terrigenous input, and a large amount of biogenic silicon was enriched.(3) The organic matter enrichment in the sedimentary stage of Longtan Formation have obvious differences, it was jointly affected by terrigenous input and paleoproductivity in the early stage, and a large number of terrigenous higher plant debris were brought in, resulting in a high content of organic carbon. It was controlled by paleoproductivity in the late stage, and the supply of terrigenous debris was weaker than that in the early stage, with organic matter mostly from marine algae.

Key words: shale lithofacies, terrigenous clast, paleoproductivity, organic matter enrichment, Longtan Formation, Permian, eastern Sichuan Basin

中图分类号:

TE122.1

肖威, 张兵, 姚永君, 王艳, 杨洪宇, 杨凯. 川东二叠系龙潭组页岩岩相特征与沉积环境[J]. 岩性油气藏, 2022, 34(2): 152–162.

XIAO Wei, ZHANG Bing, YAO Yongjun, WANG Yan, YANG Hongyu, YANG Kai. Lithofacies and sedimentary environment of shale of Permian Longtan Formation in eastern Sichuan Basin[J]. Lithologic Reservoirs, 2022, 34(2): 152–162.

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川东二叠系龙潭组页岩岩相特征与沉积环境

Lithofacies and sedimentary environment of shale of Permian Longtan Formation in eastern Sichuan Basin

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