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容积法物质平衡( MB)方程考虑了气藏基岩和裂缝的有效压缩系数。该方法可直接应用于应力敏感性天然裂缝性气藏。在有些情况下,如果忽略裂缝压缩系数的影响,用地层压力与压缩因子比值p/z与累计产量Gp的关系图计算得到的原始天然气储量就会偏高。本文提出的方程则克服了这个缺点,并举例说明了物质平衡方程的运用。可得出这样的结论:裂缝的压缩系数在计算天然裂缝性气藏天然气储量的计算过程中起着非常重要的作用。
Volumetric mass balance (MB) equations take into account the effective compressibility of bedrock and fractures in gas reservoirs. The method can be directly applied to stress-sensitive natural fractured gas reservoirs. In some cases, the original natural gas reserves calculated from the plot of formation pressure versus compression factor ratio, p / z, and cumulative production, Gp, are high if the effect of crack compression factor is ignored. The equation proposed in this paper overcomes this shortcoming and illustrates the use of the material balance equation. It can be concluded that the compressibility of fractures plays a very important role in the calculation of natural gas reserves in naturally fractured gas reservoirs.