综合多种方法识别济阳拗陷反转构造

陆相断陷湖盆陡坡带常发育多种砂体，由于其地震反射特征的特殊性，干扰了反转构造的识别。结合孤北洼陷五号桩断层带正反转褶皱和高青地区高青—平南断层正反转构造实例，分析了反转构造的地震反射特征，运用钻井资料进行地层细分和对比，声波时差进行剥蚀量的计算，流体包裹体的性质判断构造应力性质。五号桩断层带正反转褶皱地震反射特征呈现上凸下凹的外形，上部地层中间厚、两翼薄，且褶皱顶部遭受剥蚀，同相轴削蚀现象明显，下部地层保留了断陷盆地沉积充填特征；钻井资料亦显示背斜核部遭受剥蚀；声波时差随深度变化的关系曲线在剥蚀段明显错开。高青—平南断层发现了表征张性和压性环境的两类包裹体。多种方法相互约束可提高反转构造识别的准确率。

The Geochemistry Research on the Sealing Feature of Fault in Hongche Faults

The fault has dual functions in migration and accumulation of oil and gas,the one is to destruct hydrocarbon reservoir,another is to seal oil and gas.So,evaluation of fault role is very important in the exploration and development.Taking Hongche fault belt in northwest Junggar basin as example,based on the oil-gas composition difference of the reservoirs located on the north and south side of the belt,the fault role in oil-gas destruction and preservation in different geologic times.It is showed that the difference of fault intensity between the south and north fault area of the Hongche fault belt and heterogeneity in Yanshanian movement led to the different control on oil-gas reservoirs.Because the movement in the north area was stronger than the south of the Hongche fault belt did in the late Yanshanian movement,the south area is beneficial to gas accumulation and the light oil reservoirs form in north because of the loss of gas.