基于储层砂岩孔隙结构的地震岩石物理模型

Seismic Rock Physics Model Based on Pore Structure of Reservoir Sandstone

  • 摘要: 在实验室内对新疆车排子地区春光油田沙湾组储层砂岩样品进行了系统地震岩石物理实验,在确定储层砂岩中不同孔隙类型组成条件下,基于非接触模型综合考虑储层砂岩孔隙度以及孔隙形状对于干燥岩石骨架弹性性质的影响,并利用实验结果对模型参数进行标定进而建立表征目标储层岩石骨架地震弹性性质的岩石物理模型,模型结果与实验结果吻合良好。依据实验及模型结果,利用喷射流作用模型替代传统Gassmann方程进行流体替换,同样能够较好地对超声频率实验结果进行解释。

     

    Abstract: Systematical rock physics experiments were conducted on the sandstone samples of Shawan Formation in Chunguang Oilfield, Chepaizi area, Xinjiang. After determining the composition of different pore types in reservoir sandstone, the non-interaction approximation (NIA) model is used to analyze the effects of porosity and pore shape on the elastic properties of the dry frame of sandstone samples. The seismic rock physics model for the rock samples is established by using the non-interaction approximation, and the model results are in good agreement with the experimental results. Based on the experimental and model results, the squirting-fluid model is used to replace the traditional Gassmann equation for fluid substitution, which can also better explain the experimental results of ultrasonic frequency.

     

/

返回文章
返回