Porosity and rock strength of formation had got by utilizing mathematics model of porosity and rock strength which base on acoustic time have big derivation with actual situation.
现有基于声波时差的孔隙度及岩石强度计算模型反演出的地层孔隙度及岩石强度信息与实际地层偏差较大。
The gas effect on porosity derived from acoustic formation factor formula should not be neglected.
本文通过考察天然气对声波地层因素公式求孔隙度的影响，表明这种影响是不可忽视的。
For clean sandstone, the acoustic dispersion of compressional wave exists obviously when its porosity is more than 28%.
对纯砂岩，当孔隙度大于28%时存在明显纵波声频散。
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