Integrated hydro-mechanical and seismic modelling of the valhall reservoir - Predicting subsidence, AVOA and microseismic
Integrated hydro-mechanical and seismic modelling of the valhall reservoir - Predicting subsidence, AVOA and microseismic
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DOI：
10.3997/2214-4609.20131969
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发表时间：
2013
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影响因子：
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通讯作者：
D. Angus;M. Dutko;Q. Fisher;J. Kendall;A. Baird;T. Kristiansen;O. Barkved;J. Yu;S. Zhao
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文献类型：
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作者：
D. Angus;M. Dutko;Q. Fisher;J. Kendall;A. Baird;T. Kristiansen;O. Barkved;J. Yu;S. Zhao
在本文中，我们描述了一个集成地质力学、流体流动和地震建模的工作流程，可用于预测生产前和生产期间的应力分布和演变以及各种地震属性。多孔弹塑性本构模型用于在模拟过程中纳入基体失效，从而允许在模型内发展应变硬化和弱化。这对于模拟储层应力路径和应力路径不对称性尤其重要。材料模型还可以预测模型中发生故障的时间和地点，从而使我们能够对储层可能的微震响应进行建模。具体地，有限元代码ELFEN耦合到生产模拟代码VIP。该工作流程应用于数据丰富的北海 Valhall 水库，以模拟海底沉降。此外，流体力学模拟的输出与应力相关的岩石物理模型相联系，以预测地震属性，从而可以通过与观测到的地震进行比较和校准来对流体力学模拟进行额外评估。沉降预测的结果与现场观测结果吻合良好。例如，尽管岩石物理模型对 Valhall 储层岩石的校准有限，但根据流体力学模拟模型的输出计算出的 AVOA 响应与根据现场地震数据测量的结果非常相似。
In this paper, we describe a workflow that integrates geomechanical, fluid-flow and seismic modelling that can be used to predict the stress distribution and evolution as well as various seismic attributes before and during production. Poroelastoplastic constitutive model is used to incorporate matrix failure during simulation, allowing strain hardening and weakening to develop within the model. This is especially important for modelling reservoir stress path and stress path asymmetry. The material model also enables the prediction of when and where failure occurs in the model, allowing us to model the likely microseismic response of a reservoir. Specifically, the finite element code ELFEN is coupled to the production simulation code VIP. The workflow is applied to the data-rich Valhall reservoir, North Sea to model seafloor subsidence. Furthermore, the output from the hydro-mechanical simulation is linked with a stress-dependent rock physics model to predict seismic attributes, allowing for an additional assessment of hydro-mechanical simulation via comparison and calibration with observed seismic. The results of the subsidence predictions compare well with field observations. For instance, the AVOA response calculated from the output of the hydro-mechanical simulation modelling closely resembles that measured from field seismic data, despite the limited calibration of the rock physics model to the Valhall reservoir rocks.