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在非常规储层的勘探开发历程中,人们逐渐意识到当非常规储层中具有异常高的孔隙流体压力时有利于油气的保存和获得较高的单井产能,为了在非常规储层中寻找高效井、高产井,对孔隙流体压力进行定量的预测是十分有必要的.目前预测孔隙流体压力的方法主要是利用了在异常高压地层中具有低纵波速度的特性,但由于异常高压不是唯一引起纵波速度降低的原因,所以利用现有方法预测孔隙流体压力存在一定的误差.近年来随着地震勘探技术的进步,很多学者利用岩石物理实验证实孔隙流体压力与横波速度之问也有很密切的关系,因此我们从杨氏模量的定义出发结合波动方程推导了有效应力与纵、横波速度以及密度之间的关系,并引入多孔介质中的有效应力定理开发出了一种新的方法来计算非常规储层中的孔隙流体压力.利用该方法在准噶尔盆地低渗透储层的油气勘探中取得了良好的应用效果.
During the exploration and development of unconventional reservoirs, people are gradually realizing that when abnormally high pore fluid pressure in an unconventional reservoir is favorable for the preservation of oil and gas and for obtaining higher single-well productivity, in order to be used in unconventional reservoirs, It is very necessary to find the efficient well and high production well to predict the pore fluid pressure quantitatively.At present, the method of predicting the pore fluid pressure mainly utilizes the characteristics of low P-wave velocity in the abnormally high pressure stratum, but it is not unique because of the abnormal high pressure Which causes the reason of the decrease of longitudinal wave velocity, so there is a certain error in predicting pore fluid pressure by using the existing methods.In recent years, with the progress of seismic exploration technology, many scholars have used rock physics experiments to confirm that the pore fluid pressure and the shear wave velocity are very close Therefore, from the definition of Young’s modulus, we deduced the relationship between effective stress and longitudinal and shear wave velocity and density by the wave equation, and introduced the effective stress theorem in porous media to develop a new method to calculate Pore fluid pressure in unconventional reservoirs. Using this method in the low permeability reservoir in the Junggar Basin Oil and gas exploration and achieved good effect.