时移地震平均能量属性差异与储层速度变化的关系

Relationship between the difference in average energy of time-lapse and the change of reservoir velocity.

基于3层楔状模型和3层层状模型提取了时移地震平均能量属性差异,得出了时移地震属性(平均能量)差异与储层速度变化之间的关系,即平均能量差异的正、负是由储层地震波速度减小和增大引起的。正的平均能量差异对应储层速度的减小,负的平均能量差异对应储层速度的增大;差异的大小与储层厚度不存在正比关系,调谐厚度的薄层有时比厚层引起的差异要大。提取了渤海SZ36-1油田某层平均能量差异,差异反映的地震波速度变化与开采动态认识一致,说明利用以上规律能够认识地下油藏的动态变化,指导油藏开采。

The difference in average energy attribute of time-lapse was extracted based on three-layer wedge model and three-layer strati- fied model.The relationship between the difference of time-lapse average energy attribute and the change of seismic-wave velocity was obtained.The positive or negative difference of average energy is resulted from the decrease or increase of seismic-wave velocity: the positive difference of average energy responds to the decrease of seismic-wave velocity in reservoir,and the negative difference of average energy responds to the increase of seismic-wave velocity in reservoir.The value of difference is not in direct proportional to the thickness of reservoir and sometimes the thin layer with tuning thickness may cause bigger difference than the thick layer does. The difference in average energy of Bohai SZ36-1 oilfield was ex- tracted, with the change of seismic-wave velocity refleeted by the difference being in agreement with the development information. which means that.by using the abovementioned rule.we can rec- ognize the dynamic variation of the subsurface reservoirs and guide the further development.