从多相介质的角度看勘探地震与开发地震波动方程的差异

Difference of wave-equation between exploration seismology and development seismology as viewed from multi-phase medium.

勘探地震以研究储液构造为目的,开发地震以研究储液构造细节及构造内流体储存特征为目的。本文在正确阐述地层压力物理概念的基础上,首先推导出具有普遍意义的二组分复合不均匀介质运动方程,在此基础上推导出勘探地震与开发地震的位移运动方程。两者的主要区别在于预应力项的不同,勘探地震的预应力是多相介质中弹性波传播中各种因素的综合效应所引起的等效阻尼力梯度对第二相介质做的“功”,开发地震的预应力是孔隙压力梯度对第二相介质做的“功”。

Exploration seismology takes the study of reservoir structure as object and development seis-mology takes the study of details of reservoir structure and feature of fluid reserve in structure. On the basis of correctly describing the physical conception of sedimentary press,the paper first de-duced motion equation in bi-component composite uneven medium and further deduced displacement motion equation in exploration seismology and development seismology on that basis. The difference between both of them lies in different prestress. the prestress in exploration seismology is 'work' that gradient of equivalent damping force caused by combinational effects of different factors during propagation of elastic wave in multi-phase medium applies on second phase's medium; and the prestress in development seismology is 'work' that gradient of porosity pressure applies on second phase's medium.