岩石物理横波速度曲线计算技术

Calculation procedure of shear velocity curve on petrophysics

横波速度是地震勘探中的重要参数。针对实际生产中缺乏横波速度测井曲线资料,利用经验公式计算精确度不高的问题,通过对横波速度计算理论模型的研究分析,选择Biot-Gassman模型法,利用岩石矿物成分、流体成分、孔隙度及密度等测井曲线进行横波速度测井曲线的计算,并对横波速度计算技术和流程进行研究。在实际工区进行了横波速度曲线计算,计算结果与实测横波吻合程度较高,误差小于10%,该技术在储层和流体识别预测的应用中取得了较好效果。

Shear velocity is an important parameter in seismic exploration. Because of lacking shear velocity log in practice and low accuracy on the calculated value by empirical equation, method of Biot -Gassman model is selected to calculate the shear velocity log by studying the theoretical shear velocity calculation model and combining the log analyses of mineral components of rocks, fluid component, reservoir porosity, density etc. Calculation technology and procedure of the shear velocity are researched. The calculated shear velocity tallies with the actual velocity with errors lower than 10% when conducted in the field. This technology has a-chieved good results on the application of reservoir and fluid recognition and prediction. The application of the evaluation methods mentioned above was used in a project which has achieved a good result in predicting both the reservoir and the fluid in it.