浅层生物气盆地有机质富集机制:盖达姆盆地更新世页岩案例研究

IF 1.9 3区 地球科学 Q3 GEOGRAPHY, PHYSICAL
Xiaoxue Liu, Zhenxue Jiang, Xianglu Tang, Zeyu Shao, Mingshuai Xu
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引用次数: 0

摘要

有机质是页岩气的物质基础。柴达木盆地是我国浅层生物成因页岩气的重点勘探开发区域。本研究以柴达木盆地第四纪更新统页岩为研究对象,从水柱分层、古气候等方面研究了有机质富集机理。结果表明,K9-K7 段的生物生产力高于 K5-K4 段。在早更新世-中更新世(K9-K7 沉积期),由于气候温暖潮湿,水柱分层强烈,草本植物发达,导致生物生产力提高。较强的分层也导致了下层的还原环境,有利于保存上层的有机物。更新世晚期(K5-K4 沉积期)气候干燥炎热,分层作用减弱,植被演变为木本植物,降低了生物生产力。分层作用减弱导致还原环境遭到破坏,不利于沉积有机物的富集。此外,温度升高增加了产甲烷细菌的活动,消耗了大量有机物。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Mechanism of organic matter enrichment in a basin with shallow biogenic gas: a case study of Pleistocene shale in the Qaidam Basin

Organic matter is the material basis of shale gas. The Qaidam Basin is a key exploration and development area for shallow biogenic shale gas in China. In this study, we have focused on Quaternary Pleistocene shale in the Qaidam Basin, and the mechanism of organic matter enrichment was investigated in terms of water column stratification and paleoclimate. The results show that the K9–K7 section has greater biological productivity than the K5–K4 section. During the early–middle Pleistocene (K9–K7 deposition period), due to a warm and humid climate, the water column was strongly stratified and herbaceous plants developed, resulting in increased biological productivity. Stronger stratification also led to a reducing environment in the lower layer, which was conducive to the preservation of organic matter from the upper layer. During the late Pleistocene (K5–K4 deposition period), with a dry and hot climate, stratification became weaker and the vegetation evolved into woody plants, reducing biological productivity. Weaker stratification led to destruction of the reducing environment, which was not conducive to enrichment of the sedimentary organic matter. Moreover, the increased temperatures increased the activity of methanogenic bacteria, which consumed a lot of the organic matter.

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来源期刊
Journal of Quaternary Science
Journal of Quaternary Science 地学-地球科学综合
CiteScore
4.70
自引率
8.70%
发文量
82
审稿时长
6-12 weeks
期刊介绍: The Journal of Quaternary Science publishes original papers on any field of Quaternary research, and aims to promote a wider appreciation and deeper understanding of the earth''s history during the last 2.58 million years. Papers from a wide range of disciplines appear in JQS including, for example, Archaeology, Botany, Climatology, Geochemistry, Geochronology, Geology, Geomorphology, Geophysics, Glaciology, Limnology, Oceanography, Palaeoceanography, Palaeoclimatology, Palaeoecology, Palaeontology, Soil Science and Zoology. The journal particularly welcomes papers reporting the results of interdisciplinary or multidisciplinary research which are of wide international interest to Quaternary scientists. Short communications and correspondence relating to views and information contained in JQS may also be considered for publication.
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