地层结构外延法在塔中隆起古生界多期剥蚀量估算中的应用

Application of stratum structure extrapolation method in the multi-stage denudation thickness estimation of the Paleozoic in Tazhong Uplift

许多常用的剥蚀量估算方法存在着局限性.这些方法通常只能估算某一界面的总剥蚀量或者在单期构造活动区估算剥蚀量.采用地层结构外延法,探讨具有多期剥蚀历史的剥蚀量估算.地震剖面综合研究揭示,塔中地区存在3个主要剥蚀界面.对3个主要构造变革期剥蚀量的剖面和平面分布特征的分析表明,塔中地区剥蚀量的分布主要受构造控制;不同时期的剥蚀量分布差异,反映了该区的古剥蚀地貌特征和构造发育演化过程.

Denudation estimation is an important and fundamental work in the research of basins.However,the common methods for estimating the denudation thickness have some limitation:they are generally used only for estimating the total denudation thickness of some interface or the denudation thickness causing by single-stage structural activity.But the stratum structure extrapolation method can be used for estimating the denudation thickness causing by multi-stage structural activities.The comprehensive study of some seismic sections shows that there are 3 main denudation interfaces in Tazhong Uplift.The denudation distribution characteristics of these interfaces on profile and on the plane indicate that the structural evolution controls the denudation distribution in Tazhong Uplift.Moreover,the differences between the denudations of different stages can reflect the palaeogeomorphological characteristics and structural evolutionary processes of the stages.