Fault and fracture reactivation analysis by 4D geomechanical integrated modelling in one of a depleted carbonate oil field, southwest of Iran

IF 1.7 Q3 ENGINEERING, GEOLOGICAL
M. Tadayoni, Mahmoudreza Khalilbeyg, Radzuan Bin Junin
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引用次数: 0

Abstract

ABSTRACT The study field has been an oil-producing area in southern Iran for nearly 50 years. Complex geological structure and varying levels of depletion scenarios require geomechanical analysis of the reservoir to enhance its production and mitigate geomechanical risks. This paper describes creating a time-lapse (4D) integrated geomechanical model by generating 3D maps of mechanical properties and a 3D stress state that can be altered over time as pore pressure changes, then explores pressure depletion and related stress changes effects on faults and fractures reactivation. The first phase of the study was an integrated stress analysis using Image logs and sonic anisotropy interpretation. 1D–3D Mechanical Earth Model was built by gridding the reservoir and populate the model with mechanical properties. The third phase provided a distribution of stresses and associated strains under initial conditions using finite element calculations. Ultimately, stress and strain changes associated with depletion simulated by the reservoir flow model were determined during the fourth phase of study. In the resulting model, different critical coordinates points from the initial year (1992) to 2045 were selected five time-steps. Results show no critical faults reactivation but by increasing production time the instability of fractures gradually rises by stress regime changes.
伊朗西南部一个枯竭碳酸盐岩油田的断层和裂缝再活化4D地质力学综合建模分析
摘要近50年来,该研究区一直是伊朗南部的产油区。复杂的地质结构和不同程度的枯竭情况需要对储层进行地质力学分析,以提高其产量并降低地质力学风险。本文描述了通过生成力学特性的三维图和三维应力状态来创建一个时间推移(4D)综合地质力学模型,该三维图可以随着孔隙压力的变化而改变,然后探索压力损耗和相关应力变化对断层和裂缝再活化的影响。研究的第一阶段是使用图像测井和声波各向异性解释进行综合应力分析。1D–3D机械地球模型是通过对储层进行网格化来构建的,并用机械特性填充模型。第三阶段使用有限元计算提供了初始条件下的应力和相关应变的分布。最终,在研究的第四阶段确定了储层流动模型模拟的与枯竭相关的应力和应变变化。在所得到的模型中,从最初一年(1992年)到2045年的不同临界坐标点被选择了五个时间步长。结果表明,没有关键断层复活,但随着生产时间的增加,应力状态的变化使裂缝的不稳定性逐渐上升。
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来源期刊
CiteScore
3.80
自引率
0.00%
发文量
27
期刊介绍: Geomechanics is concerned with the application of the principle of mechanics to earth-materials (namely geo-material). Geoengineering covers a wide range of engineering disciplines related to geo-materials, such as foundation engineering, slope engineering, tunnelling, rock engineering, engineering geology and geo-environmental engineering. Geomechanics and Geoengineering is a major publication channel for research in the areas of soil and rock mechanics, geotechnical and geological engineering, engineering geology, geo-environmental engineering and all geo-material related engineering and science disciplines. The Journal provides an international forum for the exchange of innovative ideas, especially between researchers in Asia and the rest of the world.
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