利用地震和测井资料估算孔隙度

依据W地区钻井资料的分析，该区的速度v_P和孔隙度φ之间的关系可用经验公式φ=0.226/v_P-41.37描述。在无钻井的地区，由地震记录反演求得的速度，作一简单校正后代入上式，即可求得地震孔隙度φ_S，它可以描述地层孔隙度的区域性变化趋势。在有钻井的地区，可直接将声测井速度代入上式求得测井孔隙度φ₁，它可以描述孔隙度的局部变化。应用P.M.Doyen提出的相关模型对上述求出的φ_S和φ₁进行加权求得的孔隙度φ，更能合理地反映该区地层孔隙度的变化规律。

Estimation of porosity using seismic and logging data

In W area,the relation between velocity(ν_p)and porosity(φ)can beexpressed using the empirical formula(φ=0.226/ν_p-41.37)which wasdeveloped by analysing drilling data in this area.In the area wherethere is no drilling data,seismic porosity φ_s can be calculated by put-ting into the formula the velocity that was obtained from seismic in-version and corrected then.Seismic porosity φ_s may indicate areal po-rosity variation in a formation.In the area where there are drillingdata,logging porosity φ₁ which shows local porosity variation can becalculated by putting logging velocity into the formula.The porosityφ that is obtained by weighting φ_s and φ₁ with the use of P.M.Do-yen's correlation model indicates porosity variation in this area morereasonably than φ_s and φ₁ do.