In recent years, operational issues during the exploration of Pre-salt reservoirs have aroused the interest of the Brazilian oil and gas industry in studying karstification and its effect on carbonate reservoirs. Since then, a massive research effort was dedicated to the geology of the Brazilian onshore karstified carbonate formations; however, geomechanical modeling of reservoirs with karstic cavities remains unexplored in the literature. This work analyzes the mechanical behavior of karstified carbonate reservoirs during the hydrocarbon production period. A synthetic case study based on real geologic horizons of a Brazilian basin is carried out to predict the mechanical response of the reservoir and surroundings. The presence of a preexistent cavity developing around the reservoir symmetry axis is postulated. Different scenarios of karstic geometry and filling material are considered. Results focus on reservoir compaction, surface subsidence, and stress paths in regions of interest of the reservoir, caprocks, and cavity wall. Comparative results show that the horizontal extension of the cavity and the compressibility of the filling material play an important role in reservoir integrity. The qualitative results are useful for the oil and gas industry in terms of identifying problematic regions for wells and establishing loading limits. The findings and the preliminary results of this innovative work shall guide further advanced analyses, especially in the area of dolines generation from karstic cavities.

近年来，盐下储层勘探过程中的操作问题引起了巴西石油和天然气工业对岩溶及其对碳酸盐岩储层影响的研究兴趣。从那时起，人们就致力于巴西陆上碳酸盐岩碳酸盐岩地层的地质研究。然而，在文献中还没有探索具有岩溶腔的储层的地质力学模型。这项工作分析了在碳氢化合物生产期间岩溶碳酸盐岩储层的力学行为。进行了基于巴西盆地真实地质视野的综合案例研究，以预测储层和周围环境的机械响应。假定存在围绕油藏对称轴发展的空洞。考虑了岩溶几何形状和填充材料的不同方案。结果集中在储层，盖层和腔壁感兴趣区域的储层压实，地表沉陷和应力路径。比较结果表明，腔的水平延伸和填充材料的可压缩性在储层完整性方面起着重要作用。定性的结果对于确定油气井存在问题的区域并确定装载极限而言，对石油和天然气行业很有用。这项创新工作的发现和初步结果将为进一步的高级分析提供指导，尤其是在从岩溶腔中产生多线虫的领域。储层，盖层和腔壁感兴趣区域的应力路径。比较结果表明，腔的水平延伸和填充材料的可压缩性在储层完整性方面起着重要作用。定性的结果对于确定油气井存在问题的区域并确定装载极限而言，对石油和天然气行业很有用。这项创新工作的发现和初步结果将为进一步的高级分析提供指导，尤其是在从岩溶腔中产生多线虫的领域。储层，盖层和腔壁感兴趣区域的应力路径。比较结果表明，腔的水平延伸和填充材料的可压缩性在储层完整性方面起着重要作用。定性的结果对于确定油气井存在问题的区域并确定装载极限而言，对石油和天然气行业很有用。这项创新工作的发现和初步结果将为进一步的高级分析提供指导，尤其是在从岩溶腔中产生多线虫的领域。定性的结果对于确定油气井存在问题的区域并确定装载极限而言，对石油和天然气行业很有用。这项创新工作的发现和初步结果将为进一步的高级分析提供指导，尤其是在从岩溶腔中产生多线虫的领域。定性的结果对于确定油气井存在问题的区域并确定装载极限而言，对石油和天然气行业很有用。这项创新工作的发现和初步结果将为进一步的高级分析提供指导，尤其是在从岩溶腔中产生多线虫的领域。