多点地质统计学在点坝内部构型三维建模中的应用

首次将多点地质统计学应用于点坝内部三维建模。基于60 m超小井距资料,统计点坝内部夹层发育特征,利用统计结果人机交互绘制训练图像,定量表征了夹层的厚度、倾角、频率、密度、水平间距等信息。选取典型点坝,将单井解释夹层沿着夹层面垂直投影至点坝顶面,结合点坝沉积样式,获取建模过程中旋转数据体,以此来表征夹层走向信息。利用多点地质统计学Snesim算法进行点坝内部侧积夹层三维建模,与序贯指示模拟方法在同一点坝和旋转数据体基础上建立的点坝内部三维构型模型进行对比分析。研究结果表明,序贯指示模拟方法建立的点坝内部三维构型模型,虽然能够在一定程度上表征点坝内部夹层特征,但在表征夹层的连续性方面效果不佳,并且由于缺少训练图像的约束,只能定性展示夹层发育情况,无法达到定量刻画的程度。而利用多点地质统计学方法建立的模型,点坝内部夹层受控于训练图像及旋转数据体的双重约束,能够定量再现夹层的发育规模和产状,精确表征点坝内部夹层的几何形态与空间结构。结合水淹信息表明,此多点方法建立的点坝内部三维构型模型对于剩余油分布研究有指导意义。

Collective rotations of fission isomers in actinide nuclei

Using the total-Routhian-surface （TRS） method, the rotational behaviors of fission isomers in the second well of actinide nuclei 234-242U, 236-244pu and 238-246Cm were investigated. The pairing-deformation-frequency self-consistent TRS calculations repro- duced reasonably the experimental moments of inertia extracted from spectroscopic data. It is calculated that, in these largely elongated （β2 ≈0.65 and β4≈ 0.03） fission isomers, the ν1/2-[981] neutron and π1/2＋[651] proton align simultaneously at rotational frequency hω≈0.4 - 0.6 MeV （corresponding to spin I≈80h）, which leads to clear upbending in moments of inertia （MoI＇s）. Our calculations have indicated that the hexadecapole deformation f14 influenced significantly the frequency of the rotational alignment of the proton 1/2＋[651] orbit.