克拉2异常高压气藏开采压力变化对储层物性的影响

为了研究克拉2气藏是否可以采用衰竭式开采，以及储层岩石变形是否会对产能产生影响，开展了气藏开采压力变化对物性参数影响的实验模拟研究，研究表明，克拉2异常高压气藏开采过程中渗透率，孔隙度，孔隙压缩系数等物性参数都随开采压力而变化，但是在开采压力变化范围内，孔隙度，渗透率变化不大，渗透度变化具有轻微的不可逆性，对于克拉2气藏，储层岩石变形对产能影响不大，可以采用衰竭式开采，以充分发挥异常高压气藏弹性能量大的优势，提高开发经济效益，而孔隙压缩系数随有效压力的变化较为敏感，建议在进行气藏进行动态时把储层孔隙压缩系数考虑为压力的函数，这样有利于提高气藏生产动态预测的准确性。

Effect of recovery pressure variance on petrophysical property of abnormally high-pressure gas reservoir of Kela

In order to know whether natural depletion can be adopted in Kela2 gas reservoir, and whether reservoir rock deformation may affect productivity, experimental modeling has been performed to study the effect of recovery pressure variance on petrophysical parameters of gas reservoir. The study shows that during recovery of Kela2 abnormally high pressure gas reservoir, petrophysical parameters such as permeability, porosity and pore compressibility change with recovery pressure, but within the range of pressure change, porosity and permeability change a little, and the change of permeability slightly shows irreversible feature. In Kela2 gas reservoir, reservoir rock deformation affects productivity a little, natural depletion can be used to give full play to elastic energy of such reservoirs. Pore compressibility is sensitive to effective pressure change, so that it is proposed that pore compressibility should be considered as a function of pressure during production performance prediction. This is helpful for improving prediction accuracy of gas reservoir production performance.