Oil & Gas Geology ›› 2022, Vol. 43 ›› Issue (6): 1292-1308.doi: 10.11743/ogg20220602

• Petroleum Geology • Previous Articles     Next Articles

Research procedure of astrostratigraphy and case study of Dongying Sag, Bohai Bay Basin

Jun Peng1(), Ledan Yu1(), Tianyu Xu1, Haodong Han2, Yiming Yang1   

  1. 1.School of Geoscience and Technology,Southwest Petroleum University,Chengdu,Sichuan 610500,China
    2.Chengdu Geological Survey Center,China Geological Survey,Chengdu,Sichuan 610081,China
  • Received:2022-05-31 Revised:2022-09-14 Online:2022-11-21 Published:2022-11-21
  • Contact: Ledan Yu E-mail:pengjun@swpu.edu.cn;yldxsyhxs@126.com

Abstract:

Astrostratigraphy is to study the sedimentary sequence formed by the periodic changes of the Earth's orbit based on the Milankovitch cycle theory. It has been developing rapidly since its inception and is widely applied. However, the application of indicators and methods of data processing have always been the focus and difficulty in cycle stratigraphy research. Based on the division of astronomical cycles in the third and fourth members of Shahejie Formation in the Dongying Sag (Es3 and Es4), as well as research results gained from both home and abroad, we know that the alternative parameters of sedimentary stratigraphic sequences in astrostratigraphy research at present include paleontological parameters, geophysical and geochemical parameters, etc. The astronomical cycle identification methods mainly include lithology-based visual identification and time series analysis. While the orbital period ratio method, astronomical modulation method and hypothesis testing method are for checking and tuning the results of cyclotrons. The issues in need of attention in the current astronomical cycle stratigraphic research mainly include: the comprehensive application of alternative indicators of sedimentary stratigraphic sequences, the optimization of multiple time-frequency analysis methods, the calibration of cycle division results, and the establishment of astronomical age scales. In this study, a relatively systematic set of astronomical cycle division schemes is sorted out including the selection of alternative indicators of depositional sequences, the optimization of time series analysis methods, and the verification of cycle results. It will be of value to studying the sub-Milankovitch cycle with fine subdivision of the stratum to the millennium and 10,000-year-old level, and of referential value for researchers interested in astronomical age scales, facilitating the development of astrostratigraphy.

Key words: Milankovitch cycle, Earth orbit parameter, alternative parameter of sedimentary stratigraphic sequence, time series analysis, astronomical tuning, astrostratigraphy Dongying Sag, Bohai Bay Basin

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