天文地层学与旋回地层学的关系、研究进展及其意义

The research progress, significance and relationship of astrostratigraphy with cyclostratigraphy

旋回地层学很大程度上解释了许多地质学领域的问题,尤其是为百万年级别及以下级别的地层划分提供了新的途径;但由于旋回地层学的概念没有突出地球轨道参数对地层旋回性的影响,不能与其他驱动力导致的地层旋回相区别而产生了一些混淆,故有学者提出了"天文地层学"。通过调研大量文献,总结了天文地层学的内涵、发展过程及与旋回地层学的关系,指出利用测井时频分析、谱分析、数字滤波等方法研究天文地层学具有明显的优势,能够提取与地球轨道参数相关的地层响应信息,进而能够对百万年级别及以下级别的地层年代加以确定。随着非常规油气勘探与开发的深入,天文地层学研究将进一步向具有更高精度的亚米兰科维奇旋回尺度发展,以适应当前厚层泥页岩油气勘探与开发在地质分层上的需要。

Cyclostratigraphy has made great progress in explaining many problems in the field of geology, and provides a new way for stratigraphic classification of Ma scale and subscale. The cyclostratigraphy does not high- light the influence of earth orbit parameters on the stratigraphic cyclicity, and it cannot be distinguished from for- mation cycles resulted by other driving force, which produces some confusion. So, scholars put forward ＂astrostratigraphy＂ to solve these problems. On the basis of a large number of literature research, the connotation and development process of astrostratigraphy and its relationship with cyclostratigraphy were summarized. In addition, it is pointed out that the methods such as logging time-frequency analysis, spectrum analysis and digital illter have obvious advantages in astrostratigraphy research. These methods can be used to effectively extract strati- graphic response information related to earth orbit parameters, and then determine the stratigraphic age of Ma scale and subscale. With the development of the unconventional hydrocarbon exploration and development, the astrostratigraphy will further lead to the development of sub-Milankovitch cycle with a higher precision, so as to meet the needs of geological stratification in thick shale oil and gas exploration and development.