Quantitative Restoration of Eroded Carbonate Strata Thickness by Milankovitch Cycle: A Case Study of Ordovician Strata in Lunnan Paleo⁃Uplift, Tarim Basin

被引：1
|
作者：
Ma D. [1 ]
Wang Y. [1 ]
Chen X. [1 ]
Wang S. [1 ]
Yang M. [1 ]
Du D. [1 ]
机构：
[1] PetroChina Research Institute of Petroleum Exploration and Development, Beijing
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2023年 / 48卷 / 08期
关键词：
carbonate strata; Milankovitch cycle analysis; paleo‐structure restoration; restoration of eroded strata thickness; structural geology; Tarim Basin;
D O I：
10.3799/dqkx.2023.057
中图分类号：
学科分类号：
摘要：
It is of great significance to quantitatively restore eroded strata for tectonic study in a basin. In this paper, through spectral analysis of the ln (Th/K) curve, an indicator of climate variation resulting from Milankovitch cycles, the eroded strata of Ordovician Yijianfang and Yingshan formations are quantitatively restored on Lunnan paleo ‐uplift of Tarim Basin. The following three results are concluded:（1）Milankovitch cycles are characterized by undeveloped longer eccentricity period (413 ka, 125 ka), well developed short eccentricity period of 95 ka, slope period and precession period in Yijianfang and Yingshan formations. (2) There are 86 short eccentricity periods developed in Yijianfang and Yingshan formations. Erosion thicknesses in 8 wells are restored quantitively by comparing the amount of Milankovitch cycles in short eccentricity period in denudation zones and inside strata. (3)Distributed in the north of well zone H6 ‐ TS2 ‐ TS1 ‐ LG36, the denudation zones include northwestern and northern centers, with an erosion thickness of over 300 m and 250 m respectively. It is approved that Milankovitch cycle analysis is a proxy for quantitative restoration of eroded carbonate strata and provide insight for paleo‐structures restoration in marine carbonate basins. © 2023 China University of Geosciences. All rights reserved.
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页码：2933 / 2946
页数：13
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