为了解决可容空间控制因素多、定量分析难的问题,在沉积过程中为沉积物提供可容空间的因素总结归纳为总可容空间,将影响总可容空间的多种因素总结为初始地形、全球(绝对)海平面变化和总沉降3种主控因素。基于总可容空间的提供量和充填量相符原则,建立了初始地形、全球海平面变化和总沉降与沉积厚度、水深的定量关系;分析了可容空间主控因素对地层结构的影响,提出了总可容空间定量分析方法。总可容空间定量分析不仅可以计算总沉降,降低了三维沉积参数的恢复和表征难度,保障了沉积正、反演过程中提供的总可容空间量符合预期,还可以建立主控因素之间的定量关系,快速恢复合理的地层沉积参数,有利于沉积模型的建立。该研究不仅对可容空间主控因素之间的定量关系有着更直观的认识,还为定量研究有效可容空间奠定了基础。

Sediment accommodation space has many controlling factors and is difficult to analyze quantitively. To address this issue, we designate a “total accommodation space”, which is the sum of all accommodation spaces during the deposition process, and summarize various controlling factors into three main factors: initial topography, global (absolute) sea level change, and total settlement. Based on the principle that the volume of the total accommodation space equals its fill volume, a quantitative relationship between the initial topography, global sea level change, total settlement/sedimentary thickness, and water depth is established. The influence of the main controlling factors on the stratum structure is analyzed, and a method for quantitative analysis of total accommodation space is proposed. This method can be applied to not only calculate the total settlement—thus reducing the difficulty in recovery and characterization of 3D sedimentary parameters, and ensuring the total accommodation space provided by sedimentary forward and inversion modeling is in line with expectations—but also establish the quantitative relationship between the main controlling factors and quickly recover the reasonable stratigraphic sedimentary parameters, which is conducive to establishing a sedimentary model. This study not only provides a more intuitive understanding of the quantitative relationship between the main controlling factors of accommodation space, but also lays a foundation for the quantitative study of effective accommodation spaces.