碎屑沉积地质体构型分级方案探讨

沉积体的层次结构是复杂地质体的内在特征。针对现有碎屑沉积体层次结构分级中的不足，按照构型规模及包含关系，
以最大自旋回与最小异旋回为衔接点，采用倒序分级原则，将已有的岩性体构型与层序构型分级整合为一体化的沉积体构
型分级方案，并与我国的沉积相分级体系进行了比较分析。在沉积盆地内划分了12 级构型单元，其中1~6 级单元为层序构型，
7~9 级单元为相构型，10~12 级单元为层理构型。这一方案有利于勘探开发一体化的地下地质研究。油气田勘探阶段构型分
布的研究级别主要为1~4 级，油气田开发阶段构型分布研究的级别主要为5~9 级。我国现有的沉积相分级体系为自成因沉积
体的分级体系，但并非层次结构分级体系，且存在相单元级次不统一的问题。微相单元一般具有层次结构意义，可作为构
型单元，而亚相一般不能作为构型单元。

Discussion on Hierarchical Scheme of Architectural Units in Clastic Deposits

The hierarchical structure of clastic deposits is an intrinsic feature of a complex geologic body. As such, the clastic
deposits are studied in a hierarchical style and divided into different architectural units. A comprehensive architectural unit
hierarchical scheme in inverse order for clastic deposits is proposed through integration of the existing lithosome architecture
hierarchy scheme and the sequential architecture hierarchy scheme based on the join point of maximum autocyclicity and
minimum allocyclicity according to architectural scale and its relation. This scheme is compared with the present sedimentary
facies classification system in China. In the proposed scheme, a continental basin is divided into twelve architectural units
according to their different orders. Among them, the first to sixth units correspond to sequential architectures, the seventh to
ninth units are facies architectures, and tenth to twelfth units are in an order of bedding architecture. The proposed division
scheme will remove the hinder coursed by variety division schemes that exist in exploration and development research area. It
will benefit to promote an integration of subsurface geological study. In the proposed scheme, the architecture units in exploration
stage belong to first to fourth order, while the architecture units are grouped as fifth to ninth order in the development stage. The
present sedimentary facies hierarchical system used in China is not an architectural hierarchy system. Thus, the facies hierarchy
is not uniformed among variety sedimentary environment. The microfacies in present facies hierarchical system have significance
hierarchical meaning and could be used as an architecture unit, but the subfacies has no meaning of architecture units.