利用岩石力学性质恢复地层剥蚀量的方法OA

There are many methods for recovering the denudation amount of stratigraphic sequences in sedimentary basins,but each method has its own applicable conditions and limitations.This paper aims to establish a new method for recovering stratigraphic denudation amount based on rock mechanical properties,in order to supplement existing technical approaches.Fresh sedimentary rock samples that have undergone uplift and denudation but have not experienced severe weathering were collected.Uniaxial strain tests were conducted to obtain vertical stress and lateral stress data.During the loading process of the tests,rebound pores in the samples caused by uplift and denudation were compressed,and fractures reclosed.By plotting a vertical stress versus lateral stress cross-plot,the inflection point of the curve was identified to determine the maximum vertical stress the rock had experienced.Based on this,the maximum paleo-burial depth was calculated,and the present burial depth was subtracted to obtain the uplift and denudation amount.The denudation amount in the Shizhu Liutang area of the Sichuan Basin can reach 5 960～6 040 m.From the relationship between the stratigraphic horizons exposed at the surface and the denudation amount,as well as the paleo-thermal indicator Ro values,this result is reliable.This method,based on rock mechanical behavior,provides a new technical approach for recovering stratigraphic denudation amount and serves as an effective supplement to existing methods.