金湖凹陷戴南组砂岩敏感弹性参数分析

Analysis of Sandstone Sensitive Elastic Parameters of Dainan Formation in Jinhu Sag

岩石物理分析是岩性识别的基础性工作,针对不同的参数对岩性的敏感性不同,通过对岩石的弹性参数进行统计与分析,优选出对岩性相对敏感的岩石物理参数,对地震叠前或叠后反演结果的解释具有一定的指导意义。在金湖凹陷,通过测井资料的岩性解释,对三河工区和龙岗工区的古近系戴南组不同亚段的纵波速度、密度和纵波阻抗进行了统计和分析。研究发现,研究区砂岩总体表现为高速、低密的特征,地震纵波阻抗则难以用于砂泥岩识别。

Rock physical property analysis was the basic work of lithologic identification.Aiming at the situation of different parameters having different sensitivities to the lithology,through the statistics and analysis of rock elastic parameters,the relatively sensitive parameter of rock physical property was optimized,which was significance for guiding the interpretation of post-stack or pre-stack seismic inversion.In Jinhu Depression,the statistics and analysis on vp,density and P-impedence of different segments are carried out in Sanhe and Longgang Areas.Study shows that the sandstone in the studied area totally reveals high speed and low density,and the P-impedence can't distinguish the sandstone from the mudstone.