A coupled inversion of pressure and surface displacement
A coupled inversion of pressure and surface displacement
复制标题
压力和表面位移的耦合反演
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
K. Kishida
中科院分区：
文献类型：
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作者：
D. Vasco;K. Karasaki;K. Kishida
瞬态压力观测和地表位移测量的耦合反演为估计地下渗透率变化提供了有效的技术。该方法的优点是利用地面观测，这通常比需要钻孔的测量要便宜得多。此外，与许多其他地球物理观测结果不同，地表变形与储层孔隙流体体积变化之间的关系相对较好理解。我们的处理使我们能够将估计问题划分为三个线性子问题的序列。将该方法应用于加利福尼亚雷蒙德油田的一组倾斜和井眼压力数据，说明了该方法的有效性和实用性。这些观察结果与一次试井有关，在该试井中，流体从浅层裂缝带中取出。在测试过程中，13个倾斜仪记录了地面的运动。同时，9个传感器测量了与裂缝系统相交的井眼压力变化。我们能够在裂缝带内成像一个高渗透率的北向通道。通过对4000多条瞬态压力曲线的半定量分析，证实了这种高渗透特征的存在及其定向性。
A coupled inversion of transient pressure observations and surface displacement measurements provides an efficient technique for estimating subsurface permeability variations. The methodology has the advantage of utilizing surface observations, which are typically much less expensive than measurements requiring boreholes. Furthermore, unlike many other geophysical observables, the relationship between surface deformation and reservoir pore fluid volume changes is relatively well understood. Our treatment enables us to partition the estimation problem into a sequence of three linear subproblems. An application of the approach to a set of tilt and borehole pressure data from the Raymond field site in California illustrates its efficiency and utility. The observations are associated with a well test in which fluid is withdrawn from a shallow fracture zone. During the test, 13 tiltmeters recorded the movement of the ground surface. Simultaneously, nine transducers measured pressure changes in boreholes intersecting the fracture system. We are able to image a high permeability, north trending channel located within the fracture zone. The existence and orientation of this high‐permeability feature is substantiated by a semiquantitative analysis of some 4000 transient pressure curves.