阿姆河右岸灰岩纵波速度与密度的关系分析

P-wave Velocity-density Relation of Limestone in Amu Darya Right Bank Block,Turkmenistan

基于阿姆河右岸地区31块饱和盐水的灰岩岩样的岩石物性测试数据,对Castagna等提出的纵波速度-密度的多项式和指数关系式的正确性进行了分析。实际测试数据的分析结果表明,Castagna等提出的指数关系式在该区的预测误差较大,而多项式关系式可以较好地反映该区灰岩岩样的纵波速度-密度的关系,且随着围压的增加,多项式拟合的精度逐步提高,有效地验证了多项式关系式的正确性。该结论有助于研究区的储层预测研究,具有重要的理论和实际应用价值。

Based on petrophysical parameters of 31 water saturated limestone samples from the right bank of Amu Darya, Turkmenistan, the Castagna polynomial and exponential relation of P-wave velocity and density was evaluated. According to the result, the predictive densities by Castagna exponential relation are bigger than real values with major prediction error. However, the Castagna polynomial relation can better reflect the character of P-wave velocity and density; besides, its fitting accuracy increases gradually along with the increase of the confining pressure. The result is of great benefit to reservoir prediction research, and has important theoretical and practical value.