Astronomical influence of the development of Paleogene thin coal seam groups in offshore Lacustrine basins: A case study of the Zhu I Depression’s Enping Formation located in the northern South China Sea

IF 1.4 3区 地球科学 Q3 OCEANOGRAPHY Acta Oceanologica Sinica Pub Date : 2024-07-10 DOI:10.1007/s13131-024-2332-x
Yan Liu, Shengbing Huang, Dongdong Wang, Nan Li, Yuting Yin, Ying Chen, Zengxue Li
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Abstract

The development of the Paleogene coal seams in China’s offshore basin areas generally had the characteristics of coal measures with large thicknesses, large numbers of coal seams, thin single coal seams, poor stability, scattered vertical distribution, and a wide distribution range. This study selected the Enping Formation of the Zhu I Depression in the northern section of the South China Sea as an example to determine the macro-control factors of the development of the Paleogene coal seam groups. An analysis was carried out on the influencing effects and patterns of the astronomical cycles related to the development of the thin coal seam groups in the region. A floating astronomical time scale of the Enping Formation was established, and the sedimentary time limit of the Enping Formation was determined to be approximately 6.15 Ma±. In addition, the cyclostratigraphy analysis results of the natural gamma-ray data of Well XJ in the Enping Formation of the Xijiang Sag revealed that the development of the thin coal seams had probably been affected by short eccentricity and precession factors. The formation process of coal seams was determined to have been affected by high seasonal contrast, precipitation, and insolation. During the periods with high values of short eccentricity, the seasonal contrasts tended to be high. During those periods, fluctuations in the precession controls resulted in periodic volume changes in precipitation and insolation of the region, resulting in the development of thin coal seams. It was also found that the periods with low precession were the most conducive to coal seam development. On that basis, combined with such factors as sedimentary environmental conditions conducive to the development of thin coal seam groups, this study established a theoretical model of the comprehensive influences of short eccentricity and precession on the development and distribution of Paleogene thin coal seam groups in offshore lacustrine basins. The patterns of the Paleogene astronomical periods and paleoclimate evolution, along with the control factors which impacted the development of thin coal seam groups in offshore lacustrine basins, were revealed.

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近海湖沼盆地古近纪薄煤层群发育的天文影响:南海北部朱一凹陷恩平地层的案例研究
我国近海盆地地区古近纪煤层发育普遍具有煤层厚度大、煤层数量多、单煤层薄、稳定性差、垂直分布散、分布范围广等特点。本研究选取南海北段朱一凹陷恩平地层为例,确定了古近纪煤层群发育的宏观调控因素。分析了与该地区薄煤层组发育相关的天文周期的影响作用和规律。建立了恩平地层的浮动天文时间尺度,确定了恩平地层的沉积时限约为6.15Ma±。此外,通过对西江相恩平地层XJ井天然伽马射线数据的旋回地层学分析结果表明,薄煤层的发育可能受到短偏心和前向因素的影响。据测定,煤层的形成过程受到高季节反差、降水和日照的影响。在短偏心率值较高的时期,季节反差往往较大。在这些时期,前向控制的波动导致了该地区降水量和日照量的周期性变化,从而形成了薄煤层。研究还发现,低前向时期最有利于煤层的发育。在此基础上,结合有利于薄煤层群发育的沉积环境条件等因素,本研究建立了短偏心和前向对近海湖沼盆地古近纪薄煤层群发育和分布的综合影响理论模型。揭示了古近纪天文周期和古气候演化的规律,以及影响近海湖沼盆地薄煤层群发育的控制因素。
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来源期刊
Acta Oceanologica Sinica
Acta Oceanologica Sinica 地学-海洋学
CiteScore
2.50
自引率
7.10%
发文量
3884
审稿时长
9 months
期刊介绍: Founded in 1982, Acta Oceanologica Sinica is the official bi-monthly journal of the Chinese Society of Oceanography. It seeks to provide a forum for research papers in the field of oceanography from all over the world. In working to advance scholarly communication it has made the fast publication of high-quality research papers within this field its primary goal. The journal encourages submissions from all branches of oceanography, including marine physics, marine chemistry, marine geology, marine biology, marine hydrology, marine meteorology, ocean engineering, marine remote sensing and marine environment sciences. It publishes original research papers, review articles as well as research notes covering the whole spectrum of oceanography. Special issues emanating from related conferences and meetings are also considered. All papers are subject to peer review and are published online at SpringerLink.
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