朝向层序地层学标准化:层序地层学研究的一个重要科学命题

Towards the Standardization of Sequence Stratigraphy: An important scientific proposition of sequence stratigraphy

层序地层学后Exxon时代,层序模式的多样化代表了科学家们对复杂地层记录及其响应机制的深入认识,在赋予各种层序地层模式较强针对性的同时,也引起了许多概念体系的不协调。因此,以寻求概念术语一致性为目的的层序地层学标准化,就成为当今层序地层学所面临的一个重要科学命题。层序地层学的发展历程中,正常海退与强迫型海退的识别与区分为层序形成过程的系统描述奠定了重要基础,由于这些过程可以独立于层序地层模式,所以成为迈向标准化成功的第一步;河流相层序模式中非常规体系域概念的引入,即低和高可容纳空间体系域,同样因其独立于层序模式存在的特性,代表了层序地层学标准化又一次成功的尝试。鉴于地层堆积作用过程的旋回性和复杂性,以及地层记录的非渐变性和不完整性,追逐层序地层模式多样性所表征的变化性,以及蕴含着变化性的标准化本质,将为层序地层学的进一步发展提供更多的思考线索和途径。

In the Post-Exxon times of sequence stratigraphy, scientists came up with various sequence models of the complex stratigraphic records as well as its response mechanism, and endowed all models with strong pertinence, which aroused inconsistencies in conceptual system. Therefore, the standardization of sequence stratigraphy aiming at seeking the consistency of terminology has become an important scientific proposition of today,s sequence stratigraphy. During the development process of sequence stratigraphy, the identification and distinguishing between normal regres-sion and forced regression has laid an important groundwork for the system description of the sequence development, and has become the first step towards the standardization as these processes are model-independent. The introduction of unconventional system tracts in fluvial sequence models, namely, low and high-accommodation system tract, turned to be another successful attempt of the standardization of sequence stratigraphy because of its model-independent fea-ture. Considering the four particularities of the stratigraphic records-the complexity and the cyclicity in the strati-graphic accumulating process, the non-gradual change and the non-integrity of the stratigraphic records, chasing the variability represented by the diversity of sequence models and the nature of standardization containing variability will provide more clues and approaches for further development of sequence stratigraphy.