Classical sedimentary basin simulators account for simplified geomechanical models that describe material compaction by means of phenomenological laws relating porosity to vertical effective stress. In order to overcome this limitation and to deal with a comprehensive poromechanical framework, an iterative coupling scheme between a basin modeling code and a mechanical finite element code is adopted. This work focuses on the porous material constitutive law specifically devised to couple 3D geomechanics to basin modeling. The sediment material is considered as an isotropic fully saturated poro-elastoplastic medium undergoing large irreversible strains. Special attention is given to the development of a hardening law capable of reproducing the same porosity evolution as provided by the standard basin simulator when the sediment material is submitted to gravitational compaction under oedometric conditions. A synthetic case is used to illustrate the ability of the proposed workflow to integrate horizontal deformations in the basin model as such effects cannot be captured by the simplified geomechanics of the standard basin code. The results obtained by the coupled simulation demonstrate that horizontal compression may significantly contribute to overpressure development and brittle failure of the basin seal rocks, highlighting the importance of a coupled approach to simulate complex tectonic history.

经典沉积盆地模拟器解释了简化的地质力学模型，该模型通过将孔隙度与垂直有效应力相关联的现象学定律来描述材料压实。为了克服这一限制并处理综合的多孔力学框架，采用了盆地建模代码和机械有限元代码之间的迭代耦合方案。这项工作的重点是专门设计用于将 3D 地质力学耦合到盆地建模的多孔材料本构定律。沉积物材料被认为是各向同性的完全饱和的多孔弹塑性介质，承受着巨大的不可逆应变。当沉积物材料在 oedometric 条件下受到重力压实时，特别关注硬化定律的发展，该定律能够再现标准盆地模拟器提供的相同孔隙度演变。一个综合案例用于说明所提议的工作流程在盆地模型中整合水平变形的能力，因为标准盆地规范的简化地质力学无法捕捉到这种影响。耦合模拟获得的结果表明，水平压缩可能显着促进盆地封闭岩的超压发展和脆性破坏，突出了耦合方法模拟复杂构造历史的重要性。一个综合案例用于说明所提议的工作流程在盆地模型中整合水平变形的能力，因为标准盆地规范的简化地质力学无法捕捉到这种影响。耦合模拟获得的结果表明，水平压缩可能显着促进盆地封闭岩的超压发展和脆性破坏，突出了耦合方法模拟复杂构造历史的重要性。一个综合案例用于说明所提议的工作流程在盆地模型中整合水平变形的能力，因为标准盆地规范的简化地质力学无法捕捉到这种影响。耦合模拟获得的结果表明，水平压缩可能显着促进盆地封闭岩的超压发展和脆性破坏，突出了耦合方法模拟复杂构造历史的重要性。