叠合盆地同层多期剥蚀量恢复研究及应用

Multi-stage Erosion Restoration of Superimposed Basins and Its Application

为了恢复叠合盆地同一地层在多个时期（简称＂同层多期＂）的剥蚀量,以地震资料为基础,结合钻井,提出了同一地层在不同时期剥蚀量的恢复方法——同层多期剥蚀量恢复方法,并以该方法恢复了塔里木盆地阿克库勒凸起上奥陶统在加里东中期Ⅲ幕、海西早期的剥蚀厚度及原始沉积厚度。结果表明,阿克库勒凸起上奥陶统地层在加里东中期Ⅲ幕的剥蚀厚度为0~780m、海西早期为0~470m,前者最大剥蚀厚度在轮台断裂附近,后者最大剥蚀厚度沿现今上奥陶统尖灭线分布,原始沉积厚度具有东南厚西北薄的特点。这对重新认识阿克库勒凸起上奥陶统地层的沉积过程和该区的油气成藏史具有重要的意义。

Denudation was ubiquitous in superposition basins,and it was important to study sediment basins from buried history,tectonic evolution history and thermal history to choose correct calculation methods and resume eroded thickness.There were many methods for calculating and resuming eroded thickness.There was preferable effect on eroded thickness in superposition basin,if seismic static integration method was used.The eroded thickness of Upper Ordovician in Ackule uplift was calculated and resumed,the results show that the eroded thickness of Upper Ordovician in Ackule uplift early Hercynian period is 0~470 m,the 3rd stage of mid-Caledonian period is 0~780 m.The maximum erosion thickness of the former is near Luntai fault fracture,the biggest erosion thickness of the latter is distributed along the Ordovician pinchout line,original deposition thickness has the characteristics of thick in the southeast and thin in the northwest.It's of great significant for re-understanding the Ordovician sedimentary process and oil-gas accumulation history of Ackule uplift.