Computational Geosciences最新文献_第6页

XFVM modelling of fracture aperture induced by shear and tensile opening. XFVM 模拟由剪切和拉伸开口引起的断裂孔径。

IF 2.5 3区地球科学

Computational Geosciences Pub Date : 2024-01-01 Epub Date: 2023-07-25 DOI: 10.1007/s10596-023-10214-5

Giulia Conti, Stephan Matthäi, Patrick Jenny

{"title":"XFVM modelling of fracture aperture induced by shear and tensile opening.","authors":"Giulia Conti, Stephan Matthäi, Patrick Jenny","doi":"10.1007/s10596-023-10214-5","DOIUrl":"10.1007/s10596-023-10214-5","url":null,"abstract":"In reservoir simulation, it is important to understand the mechanical behaviour of fractured rocks and the effect of shear and tensile displacements of fractures on their aperture. Tensile opening directly enhances the fracture aperture, whereas shear of a preexisting rough-walled fracture creates aperture changes dependent on the local stress state. Since fracture dilatation increases reservoir permeability, both processes must be included in a realistic and consistent manner into the mechanical reservoir simulation model. Here, we use the extended finite volume method (XFVM) to conduct flow and geomechanics simulations. In XFVM, fractures are embedded in a poroelastic matrix and are modelled with discontinuous basis functions. On each fracture segment the tractions and compressive forces are calculated, and one extra degree of freedom is added for both the shear and tensile displacement. In this particular XFVM implementation we assume that linear elasticity and steady state fluid pressure adequately constrain the effective stress. In this paper, shear dilation is not calculated a posteriori, but it enters the equations such that aperture changes directly affect the stress state. This is accomplished by adding shear dilation to the displacement gradients and therefore ascertains a consistent representation in the stress-strain relations and force balances. We illustrate and discuss the influence of this extra term in two simple test cases and in a realistic layer-restricted two-dimensional fracture network subjected to plausible in situ stress and pore pressure conditions.","PeriodicalId":10662,"journal":{"name":"Computational Geosciences","volume":"1 1","pages":"227-239"},"PeriodicalIF":2.5,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11080645/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"52164191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Power law slip boundary condition for Navier-Stokes equations: Discontinuous Galerkin schemes 纳维-斯托克斯方程的幂律滑移边界条件非连续 Galerkin 方案

IF 2.5 3区地球科学

Computational Geosciences Pub Date : 2023-12-29 DOI: 10.1007/s10596-023-10265-8

J. K. Djoko, V. S. Konlack, T. Sayah

引用次数: 0

On spatially correlated observations in importance sampling methods for subsidence estimation 沉降估算重要采样方法中的空间相关观测

IF 2.5 3区地球科学

Computational Geosciences Pub Date : 2023-12-06 DOI: 10.1007/s10596-023-10264-9

Samantha S. R. Kim, Femke C. Vossepoel

{"title":"On spatially correlated observations in importance sampling methods for subsidence estimation","authors":"Samantha S. R. Kim, Femke C. Vossepoel","doi":"10.1007/s10596-023-10264-9","DOIUrl":"https://doi.org/10.1007/s10596-023-10264-9","url":null,"abstract":"The particle filter is a data assimilation method based on importance sampling for state and parameter estimation. We apply a particle filter in two different quasi-static experiments with models of subsidence caused by a compacting reservoir. The first model considers uncorrelated model state variables and observations, with observed subsidence resulting from a single source of strain. In the second model, subsidence is a summation of subsidence contributions from multiple sources which causes spatial dependencies and correlations in the observed subsidence field. Assimilating these correlated subsidence fields may trigger weight collapse. With synthetic tests, we show in a model of subsidence with 50 independent state variables and spatially correlated subsidence a minimum of (varvec{10^{13}}) particles are required to have information in the posterior distribution identical to that in a model with 50 independent and spatially uncorrelated observations. Spatial correlations cause an information loss which can be quantified with mutual information. We illustrate how a stronger spatial correlation results in lower information content in the posterior and we empirically derive the required ensemble size for the importance sampling to remain effective. We furthermore illustrate how this loss of information is reflected in the log likelihood, and how this depends on the number of model state variables. Based on these empirical results, we propose criteria to evaluate the required ensemble size in data assimilation of spatially correlated observation fields.","PeriodicalId":10662,"journal":{"name":"Computational Geosciences","volume":"38 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138520456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Parameterizing the fluid forces on limpet shells in unidirectional flow 单向流动中帽贝壳上流体力的参数化

IF 2.5 3区地球科学

Computational Geosciences Pub Date : 2023-11-25 DOI: 10.1007/s10596-023-10263-w

Carley Walker, Julian Simeonov, Ian Adams

引用次数: 0

Comparative calibration of 1D+2D and 3D hydrogeological watershed models 1D+2D与3D水文地质流域模型对比定标

IF 2.5 3区地球科学

Computational Geosciences Pub Date : 2023-11-23 DOI: 10.1007/s10596-023-10261-y

Gillien Latour, Pierre Horgue, François Renard, Romain Guibert, Gérald Debenest

{"title":"Comparative calibration of 1D+2D and 3D hydrogeological watershed models","authors":"Gillien Latour, Pierre Horgue, François Renard, Romain Guibert, Gérald Debenest","doi":"10.1007/s10596-023-10261-y","DOIUrl":"https://doi.org/10.1007/s10596-023-10261-y","url":null,"abstract":"In this work, we study the calibration of the parameters of a hydrogeological watershed model by comparing a 1D+2D approach that combines unsaturated 1D columns and a saturated 2D model, with a full 3D approach. In a first step, a heterogeneous permeability field is estimated by an inversion procedure for each model (2D saturated and 3D unsaturated). The fields obtained are similar but the calculation time is obviously much higher in the case of the 3D model: the 2D model seems therefore sufficient and more efficient to evaluate permeability fields using piezometric measurements in the case of vertically homogeneous aquifers. The second step focuses on the calibration of the hydraulic parameters by adjusting the hydraulic heights either derived from a 1D+2D reference model at several fictitious points distributed over the entire domain, or measured in a dozen real piezometers. Both approaches provide a good fit to the piezometric measurements, but the parameter values differ significantly: the van Genuchten alpha coefficient is unrealistic in the 1D+2D approach, reflecting a poorer consideration of the modeling unsaturated zone, while the porosity value is higher in the 3D approach, which can probably be remedied by developing a more suitable cost function.","PeriodicalId":10662,"journal":{"name":"Computational Geosciences","volume":"11 1","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138542803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effects of dispersion and non-linearity on the simulation of landslide-generated waves using the reduced two-layer non-hydrostatic model 用简化的两层非水静力模型模拟滑坡波时，频散和非线性的影响

IF 2.5 3区地球科学

Computational Geosciences Pub Date : 2023-11-17 DOI: 10.1007/s10596-023-10262-x

Dede Tarwidi, Sri Redjeki Pudjaprasetya, Didit Adytia

{"title":"The effects of dispersion and non-linearity on the simulation of landslide-generated waves using the reduced two-layer non-hydrostatic model","authors":"Dede Tarwidi, Sri Redjeki Pudjaprasetya, Didit Adytia","doi":"10.1007/s10596-023-10262-x","DOIUrl":"https://doi.org/10.1007/s10596-023-10262-x","url":null,"abstract":"This paper revisits the previously developed NH-2LR (reduced two-layer non-hydrostatic) model. The governing equations and numerical schemes are written in terms of normalized variables, with two dimensionless parameters representing dispersion and non-linearity. By utilizing analytical solutions and laboratory experiments, this study aims to validate the numerical NH-2LR model and investigate the effects of dispersion and non-linearity on the resulting waves. The first validation employs the analytical solution of the linear and fully dispersive model of a landslide moving with constant velocity on a flat bottom. The second validation involves a landslide hump sliding over a constant beach slope. A closer look at the run-up height reveals that this case is non-dispersive. Furthermore, we found that the dispersion effect was evident from the beginning of the wave formation process. Finally, we compare our numerical results to experiments on submarine landslides on sloping beaches. We found that dispersion is essential in the early generation and propagation of waves in off-shore regions. Moreover, non-linearity significantly influences the maximum run-up of landslide-generated waves.","PeriodicalId":10662,"journal":{"name":"Computational Geosciences","volume":"130 11","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138520443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi-asset closed-loop reservoir management using deep reinforcement learning 基于深度强化学习的多资产闭环油藏管理

3区地球科学

Computational Geosciences Pub Date : 2023-11-03 DOI: 10.1007/s10596-023-10255-w

Yusuf Nasir, Louis J. Durlofsky

引用次数: 0

Numerical simulation of multiscale fault systems with rate- and state-dependent friction 具有速率和状态依赖摩擦的多尺度故障系统的数值模拟

3区地球科学

Computational Geosciences Pub Date : 2023-10-31 DOI: 10.1007/s10596-023-10231-4

Carsten Gräser, Ralf Kornhuber, Joscha Podlesny

引用次数: 0

A 3D organized point cloud clustering algorithm for seismic fault data based on region growth 基于区域增长的地震断层数据三维有组织点云聚类算法

3区地球科学

Computational Geosciences Pub Date : 2023-10-26 DOI: 10.1007/s10596-023-10259-6

Lihong Zhao, Minghao Cai, Renwei Ding, Yujie Zhang, Shuo Zhao, Jinwei Zhang, Jing Yang

引用次数: 0

Implementation of Soreide and Whitson EoS in a GPU-based reservoir simulator Soreide和Whitson EoS在基于gpu的油藏模拟器中的实现

3区地球科学

Computational Geosciences Pub Date : 2023-10-21 DOI: 10.1007/s10596-023-10257-8

P. Panfili, L. Patacchini, A. Ferrari, T. Garipov, K. Esler, A. Cominelli

引用次数: 0