应用地震波速度预测砂岩孔隙度

PREDICTION OF SANDSTONE POROSITY BY APPLYING SEISMIC WAVE VELOCITY

储层的岩性、物性、含油气性、地层压力等因素都对地震波的传播速度产生影响。经统计钻井、测井资料进行无约束最小二乘拟合后表明是表述储展速度与孔隙度关系最理想的数学模型。在此基础上建立起三元介质组合模型，先利用层速度对泥质含量的响应，预测储层中泥岩的分布，进尔预测储层中孔隙的分布。运用该方法对塔里木盆地三叠一保罗系砂岩储层进行了孔隙分布预测，取得了较好效果。

The factqrs including lithologic characteristics, geophysical signature, hydrocarbonbearing and formation pressure have effects on seismic wave velocity. According to nonconstrain least-square fit of drilling and well-logging data, V￣Adi+BW+Chl/' would be anideal mathematical model in expressing the relation between velocity and porosity. On the basis of the above mentioned model, the combined model of three--element medium is proposedin this paper. The prediction of mudstone distribution in reservoirs and then the prediction ofporosity were' made by applying the response of interval velocity to the content of mud. Thismethod is used to predict the porosity distribution of T-J sandstone reservoirs in TarimBasin, and the result is good.