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1. 长江大学地球科学学院
2. 长江大学油气资源与勘探技术教育部重点实验室
3. 中海油研究总院有限责任公司
Online First:28 September 2025,
Published:28 September 2025
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张尚锋, 徐敏, 唐武, et al. 琼东南盆地北礁凹陷陵水组旋回地层学及古气候分析[J]. Bulletin of Geological Science and Technology, 2025, 44(5): 95-105.
张尚锋, 徐敏, 唐武, et al. 琼东南盆地北礁凹陷陵水组旋回地层学及古气候分析[J]. Bulletin of Geological Science and Technology, 2025, 44(5): 95-105. DOI: 10.19509/j.cnki.dzkq.tb20240264.
通过天文旋回研究,建立北礁凹陷渐新统陵水组的高精度且连续时间地层格架,并丰富该地区的古气候研究。采用时间序列分析方法,对北礁凹陷A井开展了旋回地层学分析研究;结合古生物多指标解释,开展了古气候演变分析。结果表明:在北礁凹陷陵水组沉积地层识别出了405 ka长偏心率周期、100 ka短偏心率周期、42.7 ka和43.2 ka斜率周期及20.5 ka岁差周期。通过天文调谐建立了持续时间约5.59 Ma的“浮动”天文年代标尺,以渐新世顶界面的地质年龄23.03 Ma作为时间锚点,最终建立陵水组(28.62~23.03 Ma)高精度的绝对天文年代框架。其中陵一段、陵二段和陵三段的底界面年龄分别为23.97
25.43
28.62 Ma,平均沉积速率分别为18.4
8.6
12.8 cm/ka。利用有孔虫、有机碳质量分数、有机屑组分和碳氧同位素等古气候指标重建了陵水组沉积时期的古气候,其整体表现为暖-凉-暖的变化趋势。古气候分析和天文旋回分析对比显示,这一时期的气候演化受到偏心率、岁差等天文轨道力的控制。对北礁凹陷陵水组沉积地层进行天文旋回研究,探讨天文轨道参数对古气候的控制作用,建立了渐新统陵水组高精度且连续的时间地层格架。该方法为油气勘探中优质储集体层段预测提供了精细的年代框架,促进了北礁凹陷油气勘探的发展。
ObjectiveA high-resolution
continuous chronostratigraphic framework was established using the astronomical cycles
and the paleoclimatic characteristic was analyzed for the Oligocene Lingshui Formation of the Beijiao Sag. MethodsThe cyclostratigraphy characteristics and the paleoclimatic evolution were determined by time series and multiple paleontological proxies analyses
respectively
in the Well A of the Beijiao Sag. ResultsCycles of 405 ka long eccentricity
100 ka short eccentricity
42.7 ka and 43.2 ka obliquity
and 20.5 ka precession were identified in the Lingshui Formation of the Beijiao Sag. Considering the time anchor of 23.03 at the top of Oligocene
the astronomical tuning revealed a "floating" astronomical chronology scale of 5.59 Ma. Within the high-precision absolute astronomical timeframe of the Lingshui Formation (28.62−23.03 Ma)
the bottom boundary ages of Ling Ⅰ
Ling Ⅱ
and Ling Ⅲ members can be determined as 23.97 Ma
25.43 Ma
and 28.62 Ma
respectively. These ages correspond to the average sedimentation rates of 18.4 cm/ka
8.6 cm/ka
and 12.8 cm/ka
respectively. The palaeoclimatic indicators
including the foraminifera
organic carbon
organic detrital fractions
and carbon and oxygen isotopes
suggest an overall warm-cool-warm trend during the deposition of Lingshui Formation. The comparison of palaeoclimate evolution with astronomical rotation suggested that the climate evolution during this period was mainly controlled by astronomical orbital forces such as eccentricity and age difference. Astronomical cyclostratigraphic study on the Lingshui Formation of the Beijiao Sag explores the control of astronomical orbital parameters on paleoclimate and establishes a high-resolution and continuous chronostratigraphic framework. ConclusionThis method provides a refined chronological framework for predicting high-quality reservoir intervals in oil and gas exploration
promoting the development of oil and gas exploration in the Beijiao Sag.
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