Performing stress‐sensitivity evaluation on a high‐temperature and high‐pressure gas reservoir is essential for correctly understanding the characteristics of physical property changes and reasonably designing the development scheme of a reservoir under stratum conditions. By focusing on six core samples with different physical properties in a gas field in the Yingqiong Basin, stress‐sensitivity experiments have been conducted along with mercury intrusion porosimetry and X‐ray diffraction measurements to study the relationship among porosity, permeability, and effective stress at a temperature of 140°C and effective stress ranging from 2 MPa to 70 MPa. Our results showed that the stress‐sensitivity curve characterized by three‐stage segmentation is primarily affected by average pore radius and mineral composition but has no direct relation with porosity and permeability. Meanwhile, the stress sensitivity of permeability is mainly related to the average pore throat radius and mineral composition of core specimen. The smaller the pore throat radius and the higher the clay content, the stronger the stress sensitivity of permeability. Under high‐temperature and high‐pressure conditions, the stress sensitivities of permeability and porosity can be characterized by power functions although the stress sensitivity of permeability is about 2–11 times higher than that of porosity.

中文翻译：

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应琼盆地高温高压砂岩气藏应力敏感性试验研究

对高温高压气藏进行应力敏感性评估，对于正确理解物性变化特征和合理设计地层条件下的气藏开发方案至关重要。通过对应琼盆地气田中六个具有不同物理性质的岩心样品进行研究，进行了应力敏感性实验以及压汞法和X射线衍射测量，以研究孔隙度，渗透率和有效应力之间的关系。温度为140°C，有效应力范围为2 MPa至70 MPa。我们的结果表明，以三段分段为特征的应力敏感性曲线主要受平均孔隙半径和矿物成分的影响，但与孔隙率和渗透率没有直接关系。同时，渗透率的应力敏感性主要与平均孔喉半径和岩心标本的矿物成分有关。孔喉半径越小，粘土含量越高，渗透率的应力敏感性越强。在高温和高压条件下，渗透率和孔隙度的应力敏感性可以通过幂函数来表征，尽管渗透率的应力敏感性比孔隙度的应力敏感性高约2-11倍。渗透率的应力敏感性主要与平均孔喉半径和岩心标本的矿物成分有关。孔喉半径越小，粘土含量越高，渗透率的应力敏感性越强。在高温和高压条件下，渗透率和孔隙度的应力敏感性可以通过幂函数来表征，尽管渗透率的应力敏感性比孔隙度的应力敏感性高约2-11倍。渗透率的应力敏感性主要与平均孔喉半径和岩心标本的矿物成分有关。孔喉半径越小，粘土含量越高，渗透率的应力敏感性越强。在高温和高压条件下，渗透率和孔隙度的应力敏感性可以通过幂函数来表征，尽管渗透率的应力敏感性比孔隙度的应力敏感性高约2-11倍。