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首页> 外文期刊>Petroleum exploration and development >Stress sensitive experiments for abnormal overpressure carbonate reservoirs: A case from the Kenkiyak fractured-porous oil field in the littoral Caspian Basin
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Stress sensitive experiments for abnormal overpressure carbonate reservoirs: A case from the Kenkiyak fractured-porous oil field in the littoral Caspian Basin

机译：异常超压碳酸盐岩储层的应力敏感实验：以滨海里海盆地肯基亚克（Kenkiyak）压裂多孔油田为例

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摘要

According to the characteristics of overpressure carbonate reservoirs of the Kenkiyak pre-salt oil field in the littoral Caspian Basin, cores were made artificially and the stress sensibility of matrix cores and cores with non-packed, semi-packed and fully packed fractures were analyzed. The method of gas measurement was used in the experiment. The confining pressure of the sample cores was first increased and then decreased. When the confining pressure became stable, porosity and permeability data from each pressure point were obtained to analyze stress sensibility of cores. The results showed that the stress sensibility of these four types of cores with a descending order is cores with non-packed fractures, cores with semi-packed fractures, cores with packed fractures, and matrix cores. With the decrease in packing degree of core fractures, the stress sensitivity of core permeability increased and the recovery degree of permeability decreased; the recovery degree of porosity and permeability of the matrix cores and cores with fully packed fractures was high with the recovery of pressure and these two types of cores showed elastic-plastic features. By contrast, the recovery degree of porosity and permeability of cores with partly packed and unpacked fractures was lower and these two types of cores showed plastic features. With the increase of confining pressure, the variation of porosity and permeability showed relatively regular exponential variations.
机译：根据滨海里海肯基亚克盐前油田的超压碳酸盐岩储层特征，人工制作岩心，分析了基质岩心和非充填，半充填和全充填裂缝的岩心的应力敏感性。实验中采用气体测量的方法。样品芯的围压首先增加，然后降低。当围压稳定后，获得每个压力点的孔隙率和渗透率数据，以分析岩心的应力敏感性。结果表明，这四种类型的岩心的应力敏感性由高到低依次为：非堆积裂缝岩心，半堆积裂缝岩心，堆积裂缝岩心和基质岩心。随着岩心裂缝堆积度的降低，岩心渗透率的应力敏感性增加，渗透率恢复率降低。随压力的恢复，基质岩心和充满压裂裂缝的岩心的孔隙度和渗透率恢复程度较高，这两类岩心均表现出弹塑性特征。相比之下，具有部分填充和未填充裂缝的岩心的孔隙度和渗透率的恢复程度较低，并且这两种类型的岩心都具有塑性特征。随着围压的增加，孔隙度和渗透率的变化呈相对规则的指数变化。

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