刘3井区油藏描述采用的地球物理方法

Geophysical methods applied to reservoir description in Liu-3 borehole area

在伊舒盆地刘3井区油藏描述工作中，采用了三种地球物理解释方法：①基于三单元模型的孔隙率平面变化规律预测方法，用此方法解决了常规预测法中因泥岩影响所计算的孔隙率偏大问题；②对弱反射界面利用瞬时相位剖面编制t0构造图，实现了对油层组的精细构造解释；③利用速度谱资料建立油层顶、底面的平均速度场，进行时深转换，大大提高了构造图的精度。上述方法在刘3井区的应用中，均取得了良好效果。

Reservoir description in Liu-3 borehole area in the Yishu basin was made by us- ing the following geophysical interpretation methods.Lateral porosity variation prediction method based on triple-element model,the method removes high-side porosity that results from shale influence and is calcu-lated by conventional method.t0 contour maps of weak reflectors are plotted by interpreting instantaneous-phase sections, so that minute structure interpretation of reservoir series can be achieved desirably.Time-depth conversion ls done by using the averaged velocity field which is derived from the top and bottom velocity flelds of a reservoir with the use of velocity spectrum data,thus greatly improving structural map.The methods brlng satisfactory effect in Llu-3 borehole area.