弹性参数直接反演技术在储层流体识别中的应用

叠前地震反演是目前应用于流体识别的主要技术,但在具体研究区储层地质地震特点的应用过程中,存在岩石物理基础研究薄弱、多解性等问题。为提高流体地震识别精度,以KD地区为例,开展了陆相碎屑岩典型储层的岩石物理基础、叠前地震反演技术研究及应用。利用河道砂岩实验室岩石物理测试数据,分析了岩性、物性及孔隙流体对岩石物理参数的影响;基于弹性阻抗方程,通过弹性参数直接反演获取对储层流体敏感的参数,对KD地区河道砂岩储层进行了流体识别,提高了流体地震识别精度,取得了较好的地质效果。

The application of elastic parameters direct inversion to reservoir fluid identification

Pre-stack seismic inversion seems to be the main technique for reservoir fluid identification; nevertheless, there exist prob- lems such as petrophysical weakness and multiple solutions in its application to investigating geological features of the specific study area. In order to improve the precision of seismic identification of fluid, the author carried out studies of typical reservoirs in such aspects as petrophysical basis and prestack seismic inversion. According to petrophysical data of channel sand tested in the laboratory, the in- fluence of pore fluid and lithology on petrophysical elastic parameters were analyzed. Based on elastic impedance equation, the author obtained the sensitive parameters to the reservoir fluid by means of direct inversion of elastic parameters. Pre-stack seismic inversion was used for fluid identification of shallow layer channel sand reservoir in KD area. The results achieved by the authors show that seismic identification accuracy of fluid has been improved, and a good geological effect has been acquired.