石油地质与工程2025，Vol.39Issue(6)：44-50,7.DOI:10.26976/j.cnki.sydz.202506008
长昌凹陷陵水组旋回地层学分析及年代标尺的建立
Cyclostratigraphic analysis and chronostratigraphic scale construction of the Lingshui Formation in the Changchang Sag
周奕安 1王岩 1李典恒 1李宇1
作者信息
- 1. 华北理工大学应急管理与安全工程学院,河北 唐山 063000
- 折叠
摘要
Abstract
This study conducts a cyclostratigraphic analysis of the Lingshui Formation in the Changchang Sag,Qiongdongnan Basin,by integrating astronomical cycle interpretation and time series analysis.Utilizing apatite fission track(AFT)dating,it investigates the correlation between stratal uplift/downwarp dynamics and sedimentation rates,establishing a high-precision chronostratigraphic scale for the Oligocene Lingshui Formation.Results indicate that the Lingshui Formation preserves distinct astronomical cycle signals.Through sedimentation rate correlation coefficient(COCO)analysis,the cycle thickness corresponding to the 405-kyr long eccentricity period is determined to be 35.0 m.Astronomical tuning reveals 12.5 cycles of this 405-kyr periodicity,spanning approximately 5.1 million years.Anchored by the Oligocene top bounda-ry age of 23.03 Ma,the estimated base age of the Lingshui Formation is 28.13 Ma.AFT and sedimentation rate curve comparisons demonstrate that during 23.03-28.13 Ma,sedimentation rates gradually decreased in conjunction with slow stratal uplift.The established chronostratigraphic scale provides critical guidance for oil and gas exploration in the Changchang Sag by enabling precise temporal correlation and reservoir characterization.关键词
琼东南盆地/长昌凹陷/旋回地层学/天文年代标尺/磷灰石裂变径迹/沉积速率Key words
Qiongdongnan Basin/Changchang Sag/cyclostratigraphy/astrochronological scale/apatite fis-sion track/sedimentation rate分类
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周奕安,王岩,李典恒,李宇..长昌凹陷陵水组旋回地层学分析及年代标尺的建立[J].石油地质与工程,2025,39(6):44-50,7.
