Abstract

Hydrocarbon reservoir structures are subjected to tectonic forces along the geological time that cause rock deformation and break into faulted zones. Faulted reservoirs, enclose certain complexity in terms of the distributed effective stresses, rock plastic alteration, slipping and fault block displacement. In this study, we develop a three-dimensional (3D) geomechanical reservoir model with faulted and compartmentalized geometry, located in the offshore deepwater environment of the Levantine basin in the Eastern Mediterranean, based on non-linear finite element analysis (FEA). A regional structural and stress map was also constructed, integrating various data sources, to present the regional stress setting to enhance this work. The assessment of the geomechanical impacts on the reservoir provides important information in reservoir studies, that can analyze potential stability issues during the depletion to optimize the field production planning. Stress–strain evolution in the reservoir is primarily affected by the in situ stresses, the geometry of faults, and the degree of compartmentalization. The results demonstrate clearly the mechanism of stress transfer transmission and the impact between the fault block compartments in the reservoir. Fault contacts exhibit a higher tendency for rock displacements and deformations. Plastic yielding develops at a narrow extent along the faults. The risk of fault slipping depends on the depletion strategy, but it is low in all cases. No significant reduction in permeability was found at the end of reservoir depletion. Overall, geomechanics integration enriches and improves the dynamic reservoir models and applications.

中文翻译：

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东地中海深水断层油藏 3D 地质力学有限元分析

摘要

油气储层结构在地质时期受到构造力的作用，导致岩石变形并断裂成断层带。断层储层在有效应力分布、岩石塑性蚀变、滑移和断块位移等方面具有一定的复杂性。在本研究中，我们基于非线性有限元分析 (FEA)，开发了一个具有断层和分区几何形状的三维 (3D) 地质力学油藏模型，该模型位于东地中海黎凡特盆地的近海深水环境中。还构建了区域结构和应力图，整合了各种数据源，以呈现区域应力设置，以加强这项工作。对储层地质力学影响的评估为储层研究提供了重要信息，可以分析枯竭期间潜在的稳定性问题，以优化油田生产规划。储层中的应力-应变演化主要受地应力、断层几何形状和分区程度的影响。结果清楚地揭示了应力传递传递机制以及油藏断块隔室之间的影响。断层接触表现出岩石位移和变形的较高趋势。塑性屈服沿断层小范围发育。断层滑动的风险取决于耗尽策略，但在所有情况下风险都很低。在储层枯竭结束时没有发现渗透率显着降低。总体而言，地质力学集成丰富和完善了动态油藏模型和应用。