基于地层沉积反演的深时海平面变化曲线恢复方法  

Deep-time sea-level change curve recovery:A recovery method based on stratigraphic inverse modeling

作　　者：沈禄银 潘仁芳[1] 段太忠[2] 刘彦锋[2] 李蒙 廉培庆[2] 黄渊 张德民[2] SHEN Luyin;PAN Renfang;DUAN Taizhong;LIU Yanfeng;LI Meng;LIAN Peiqing;HUANG Yuan;ZHANG Demin(College of Earth Sciences,Yangtze University,Wuhan 430100,China;Petroleum Exploration&Production Research Institute,SINOPEC,Beijing 100083,China)

机构地区：[1]长江大学地球科学学院,湖北武汉430100 [2]中国石化石油勘探开发研究院,北京100083

出　　处：《地学前缘》2023年第2期109-121,共13页Earth Science Frontiers

基　　金：中国科学院战略先导A项目子课题“深层碳酸盐岩油气储层地质建模(XDA14010204)”;国家科技重大专项(2016ZX05033-003)。

摘　　要：目前常用的海平面曲线恢复方法主要是基于地层沉积的旋回性分析和同位素测量,受地层不完整性的影响较大,海平面变化恢复不够合理。本文基于全球海平面变化旋回与天文旋回、沉积旋回在时间周期上具有较好的多级旋回对应特征,提出了采用傅里叶变换多级正弦分解函数化海平面变化曲线,然后通过地层沉积反演求取函数化的全球海平面变化参数的方法。利用地层沉积模拟方法,求取了元坝地区长兴期的全球海平面曲线,与同时期的Haq曲线、Fischer方法获得的海平面变化曲线相比,具有更多的海平面变化信息,恢复的海平面变化更合理。傅里叶级数函数化海平面变化曲线不仅推动了海平面变化的定量化和函数化发展,还有利于用地层沉积反演求取海平面变化曲线。这种求取海平面变化的新思路,与传统的海平面变化恢复方法相比定量化程度高,对输入资料要求低,具有较好的适用性和更广的应用前景。The commonly used sea-level curve recovery methods are mainly based on the cyclic analysis and isotopic measurement of stratigraphic sedimentation. These methods are greatly affected negatively by the incompleteness of stratigraphic data, resulting in unreasonable recovery results. In view of this, a global sea-level curve recovery method based on stratigraphic sedimentary inversion is proposed. Based on the fact that the global sea-level cycle has good corresponding relationships with astronomical and sedimentary cycles as multi-scale, multi-level cycles, this method uses trigonometric Fourier series expansion to transform the sea-level change curve, which can greatly smooth out the sea-level curve in stratigraphic sedimentary inversion. Only seven parameters are needed in the new method to characterize sea-level changes in the Haq sea-level curve, demonstrating its applicability. The global sea-level curve of the Changxing Period in the Yuanba area is obtained by stratigraphic sedimentary simulation, which yields more information on the sea-level change, and the recovered sea-level change is more reasonable compared to the Haq sea-level curve and the sea-level change curve of Fischer for the same period. Thus, Fourier series-functionalized sea-level change curve is useful not only in quantification and functionalization of sea-level change, but also in stratigraphic sedimentary inversion to obtain sea-level change curve. Compared with the traditional sea-level change recovery method, this new idea of measuring sea-level change has higher level of quantification, lower requirements for input data, and better applicability and wider application prospect. The application prospect is also discussed.

关 键 词：地层沉积反演 天文旋回 傅里叶变换 沉积正演模拟 全球海平面变化 

分 类 号：P539.2[天文地球—古生物学与地层学] P736.2[天文地球—地质学] X145[环境科学与工程—环境科学]