牛庄洼陷浊积岩砂体储层物性地震预测

对牛庄洼陷沙三段已知浊积砂体的岩石物性和地震属性进行统计、回归等分析，研究表明：①牛庄洼陷沙三段不同岩性的速度具有一定差异，灰质砂岩速度最高，砂岩速度次之，泥岩速度最低；②反射振幅值太强和太弱的浊积砂体，其储层物性都不好，根据其反射振幅值可定性地判断砂体储层物性；③全区难以确定统一的地震属性与储层参数的对应关系，但同一个砂体，影响其反射振幅变化的外在因素基本相同，可应用回归经验公式对其物性进行定量计算；④在利用地震属性预测储层物性时，不能片面、盲目地追求预测方法和计算模型的普适性。

Seismic prediction of physical property for turbidite sand body reservoir in Niuzhuang sub-sag

Statistic and regressive analyses have been carried out for petrophysical character and seismic attributes of known turbidite sand body in Es3 of Niuzhuang sub-sag. The studied results showed:(1) the velocities of different lithology in Es3 of Niuzhuang sub-sag are different, the velocity of carbonic sandstone is the highest,sandstone is second and mudstone is the lowest; (2)the physical property of reservoir is bad for turbidite sand body characterized by very strong and very weak reflection amplitude,so that the physical property of reservoir could be identified qualitatively by reflection amplitude; (3) the corresponding unitary relationship between seismic attributes and reservoir parameters is difficult to be defined in total area,but external factors affected variation of reflection amplitude are basically same for same sand body,so that the regressive experimental formula can be used for quantitative calculation of physical property;(4)it can't unilaterally and blindly seek the general adaptability of predicting methods and calculating models when using seismic attributes to predict the physical property of reservoir.