准噶尔盆地南缘中深构造成像特征与规律

从西湖1井实钻与预测的垂深差距远小于物探精度误差范围的现象出发,引出具有南缘区域特征的正演模型并进行正演模拟分析,从临界状态的角度来审视深度域模型到时间域模型的定量关系,试图寻找模型坐标域变化所引起的相关参数变化是否存在内在的规律性。模拟表明:在中深构造,时间域与深度域的变形不可能一一对应,存在变形因子;在复杂构造叠合的地区,速度呈现"低初速、多非线性变化"特征,以及衡量速度变化高低对构造的影响呈现"高提低拉"的规律。

The Imagery Characteristics and Regularity for the Middle-deep Structures in the Southern Margin of the Zhunger Basin

The vertical depth differential value between the real depth drilled in well Xihu-1 and the predicted depth is much less than the geophysical accuracy error range.According to this phenomenon,forward model which can show the regional structural characteristics of the southern margin of the Zhunger Basin has been constructed,and forward modeling analysis has been conducted.From the perspective of the critical state,the quantitative relationship between depth-domain and time-domain model has been analyzed in order to find out the inherent regularity in parameter changes caused by model coordinate system changes.The modeling results show that in the middle-deep structure,the deformation in time domain can not correspond to deformation in depth domain,and distortion factor existed.In complex structural superimposed areas,the velocity is characterized by low initial velocity,non-linear velocity variation. The velocity change has certain influence on structure,showing the regularity of "high put low pull".