超压地层储层孔隙度的预测方法

Reservoir porosity prediction in over-pressured formations

根据超压体系的地质特征,综合考虑超压、机械压实作用、胶结作用及溶解作用对储层孔隙度的影响,建立了超压地层的储层孔隙度预测模型.渤海湾盆地歧北凹陷的应用结果表明,储层孔隙度的预测误差随填隙物体积分数的增加而增加,当储层填隙物体积分数小于10.0%时,预测误差小于2.0%,达到了国外多元线性储层孔隙度预测模型的精度.该模型所用的参数较少,可用于新区盆地储层孔隙度的预测.

A new model for pre-drilling reservoir porosity prediction was developed taking into account the effects of overpressures, compactions, resolutions and cementations on reservoir porosity based on the geological characteristics of over-pressured basins. As the applied results in the Qibei Depression of the Bohai Bay Basin shows, the errors of reservoir porosity predictions increase with the pore-fillings increase, and the error is lower than 2.0% when the pore-filling is less than 10.00%, which reaches the advanced level of multivariate linear models at present. The model can be applied to the frontier basins with limited information as a few parameters are needed to run it.