川南威远地区西缘下志留统龙马溪组黑色页岩沉积古环境及其对有机质富集的控制

李生美; 沈均均; 叶成林; 白森; 熊小林; 谢锐杰; 程辉; 陈浩; 孟江辉

doi:10.11781/sysydz2025061329

川南威远地区西缘下志留统龙马溪组黑色页岩沉积古环境及其对有机质富集的控制

doi: 10.11781/sysydz2025061329

李生美^1,2,
沈均均^1, ,,
叶成林³,
白森⁴,
熊小林⁴,
谢锐杰²,
程辉⁵,
陈浩⁶,
孟江辉¹

1. 长江大学非常规油气省部共建协同创新中心, 武汉 430100;
2. 长江大学地球物理与石油资源学院, 武汉 430100;
3. 中石油油田技术服务有限公司, 北京 100007;
4. 中石油长城钻探工程有限公司四川页岩气项目部, 四川威远 642450;
5. 中石油长城钻探工程有限公司地质研究院, 辽宁盘锦 124010;
6. 中石油川庆钻探工程有限公司地质勘探开发研究院, 成都 610051

基金项目:

国家自然科学基金面上项目(42372168)和湖北省自然科学基金地质创新发展联合基金(2025AFD441)联合资助。

详细信息

作者简介:
李生美(1999—)，女，硕士生，从事非常规沉积及储集层研究。E-mail:1147247018@qq.com。

通讯作者:
沈均均(1983—)，男，博士，副教授，从事沉积储层及非常规油气资源调查与评价研究。E-mail:shenhema@163.com。

中图分类号: TE121.3
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出版历程
- 收稿日期: 2025-06-06
- 修回日期: 2025-10-17
- 网络出版日期: 2025-11-26

Sedimentary paleoenvironment and its control on organic matter enrichment of black shale in Lower Silurian Longmaxi Formation on western margin of Weiyuan area, southern Sichuan Basin

1. Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University, Wuhan, Hubei 430100, China;
2. College of Geophysics and Petroleum Resources, Yangtze University, Wuhan, Hubei 430100, China;
3. Oilfield Technology Service Co., Ltd., CNPC, Beijing 100007, China;
4. Sichuan Shale Gas Project Department, Greatwall Drilling Company, CNPC, Weiyuan, Sichuan 642450, China;
5. Geology Research Institute, Greatwall Drilling Company, CNPC, Panjin, Liaoning 124010, China;
6. Geological Exploration and Development Research Institute, Chuanqing Drilling Engineering Co., Ltd., CNPC, Chengdu, Sichuan 610051, China

摘要

摘要:
目前针对川南地区沉积古环境和有机质富集主控因素的研究多集中于泸州洼陷区，而对靠近乐山—龙女寺古隆起威远地区的相关研究较为缺乏，导致对区内有机质富集主控因素的认识尚不清晰。基于此，通过对威远地区西缘下志留统龙马溪组沉积学及有机地球化学特征进行对比分析，探讨有机质富集主控因素及其形成模式。结果表明：LM1—LM5沉积期(鲁丹期)，盆地处于挠曲—沉降期，构造活动稳定，海平面最高，陆源矿物碎屑输入低，水体以厌氧环境为主，保存条件、陆源矿物碎屑输入和古生产力水平共同导致该沉积期有机质含量最高；LM6沉积期(埃隆早期)，盆地进入挠曲—迁移期，构造活动增强，渝北被动大陆边缘地区障壁开口开始打开，洋流活动增强，底水以厌氧—贫氧环境为主，保存条件变差和古生产力水平升高是导致TOC含量与LM1—LM5沉积期差异不大的主要因素；LM7沉积期(埃隆中期)，障壁开口持续打开，海平面进一步下降，底水还原性更差，洋流活动继续增强，保存条件变差和陆源矿物碎屑输入升高是造成有机质含量降低的主要因素；LM8沉积期(埃隆晚期)，洋流活动达到最强，古生产力水平升至最高，但底水变为贫氧—富氧环境，保存条件变差是导致有机质含量降至最低的主要因素。结论认为，研究区有机质含量持续降低与古地貌和海平面波动所主导的沉积古环境演化过程密切相关。
- 上升洋流 /
- 前陆挠曲演化 /
- 有机质富集 /
- 乐山—龙女寺古隆起 /
- 威远地区 /
- 四川盆地
Abstract:
Current research on sedimentary paleoenvironments and the main factors controlling organic matter enrichment in the southern Sichuan Basin primarily focuses on the Luzhou subsag area, while studies on the Weiyuan area near the Leshan-Longnüsi paleo-uplift are relatively scarce. This has led to an unclear understanding of the main controlling factors of organic matter enrichment in the area. Accordingly, through a comparative analysis of the sedimentological and organic geochemical characteristics of the Lower Silurian Longmaxi Formation on the western margin of the Weiyuan area, the main controlling factors and formation models of organic matter enrichment were explored. The results indicated that during the LM1-LM5 sedimentary periods (Rhuddanian), the basin experienced flexural subsidence. Tectonic activity was stable, sea level was at its highest, terrigenous clastic input was low, and the water body was predominantly anoxic. Preservation conditions, terrigenous clastic input, and paleoproductivity collectively resulted in the highest organic matter content in this sedimentary period. In the LM6 sedimentary period (early Aeronian), the basin entered a flexural-migration phase. Tectonic activity intensified, the barrier in the passive continental margin area of northern Chongqing began to open, ocean current activity strengthened, and the bottom-water environment was mainly anoxic to dysoxic. The deterioration of preservation conditions and the increased paleoproductivity were the main factors leading to only minor difference in total organic carbon (TOC) content compared with the LM1-LM5 sedimentary periods. During the LM7 sedimentary period (middle Aeronian), the barrier continued to open, sea level dropped further, bottom-water reducibility became worsened, and ocean current activity continued to intensity. The deterioration of preservation conditions and increased terrigenous clastic input were the main factors causing the decrease in organic matter content. During the LM8 sedimentary period (late Aeronian), ocean current activity reached its peak and paleoproductivity rose to its highest level. However, the bottom-water environment became dysoxic to oxic. The deterioration of preservation conditions was the main factor causing the organic matter content to drop to its lowest level. It is concluded that the continuous decrease in organic matter content within the study area is closely related to the sedimentary paleoenvironment evolution process, which was primarily controlled by paleogeomorphology and sea-level fluctuations.
- rising ocean current /
- foreland flexure evolution /
- organic matter enrichment /
- Leshan-Longnüsi paleo-uplift /
- Weiyuan area, Sichuan Basin /

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