model to relate PWave attenuation to fluid flow in fractured tight 相关模型的P波衰减在裂缝性致密流体流动ppt课件.pptVIP

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model to relate PWave attenuation to fluid flow in fractured tight 相关模型的P波衰减在裂缝性致密流体流动ppt课件.ppt

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model to relate PWave attenuation to fluid flow in fractured tight 相关模型的P波衰减在裂缝性致密流体流动ppt课件

A model to relate P-Wave attenuation to fluid flow in fractured tight gas sands, siliceous shales, and carbonate reservoirs;Introduction;Figure 1. The effect of frequency and azimuths on poroelastic attenuation for a global squirt flow length = 5 cm (representing fluid flow in cracks) and a local squirt flow length = 0.2 mm (representing fluid flow in the matrix). This model is for wave propagation in a fractured tight sand unit. ;Figure 2. The effect of frequency and azimuths on poroelastic attenuation for a global squirt flow length = 7 cm (representing fluid flow in cracks) and a local squirt flow length = 0.2 mm (representing fluid flow in the matrix). This model is for wave propagation in a fractured tight sand unit. In this environment, as long as there is fluid flow in the cracks, the fluid motion will attenuate the acoustic waves. In the event that there is not crack -induced fluid flow, we cannot expect high attenuation for waves traveling perpendicular to the fracture system.; The model-based scheme is applied first to data from the Siberia Ridge field, which is a tight gas sand reservoir located in Wyoming. The results give responses in the frequency domain containing the effect of scattering and intrinsic attenuation when a sand-shale-coal sequence is modeled. By comparing the total attenuation with the scattering attenuation we observe the differences associated with the flow units. Flow units can be identified because the increase in attenuation is due to the interaction of fluid flow with the rock matrix. The examples show scattering effects of shales and coals and demonstrate that coals control the scattering attenuation. The elastic attenuation is shown at all frequencies and the fluid flow effects are observed in the sonic and crosswell frequency ranges. This model study suggests that low frequency measurements such as 3D seismic would not be able to map fluids through poroelasticity. Only borehole related seismic measurements have the