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孔隙度对于石油勘探和海底测量等领域是一个重要的参数,但是海洋沉积物孔隙度的预测一直是个难点.对Gassmann方程进行变换,利用孔隙度和纵波声速的相关关系求解出孔隙度预测公式,并将该公式应用于南海南部海底沉积物孔隙度预测中.沉积物声速是根据南海采集的柱状样品在甲板上测量的,孔隙度是在实验室测量的.将Gassmann方程预测结果与沉积物柱状样品实验室测量结果进行对比研究.结果表明Gassmann方程能够较好的预测海底沉积物的孔隙度,对浅海地区的孔隙度预测尤为准确.利用误差范数分析法对Gassmann方程各输入参数进行敏感性分析,发现沉积物纵波声速对孔隙度预测精度影响最大.
Porosity is an important parameter in the field of petroleum exploration and seafloor measurement, but the prediction of the porosity of marine sediment has been a difficult point.Gasmann’s equation is transformed, the porosity prediction formula is obtained by using the correlation between porosity and P- And the formula is applied to predict the porosity of sediments in the southern South China Sea.The sediment sound velocity is measured on the deck according to the columnar samples collected in the South China Sea and the porosity is measured in the laboratory.The prediction results of the Gassmann equation are compared with the sedimentary columnar The results show that the Gassmann equation can predict the porosity of seafloor sediment well and predict the porosity of shallow sea area more accurately.The sensitivity of the Gassmann equation to the input parameters is analyzed by error norm analysis It is found that the P-wave velocity of sediment has the greatest influence on the prediction accuracy of porosity.