首页|The AVO Effect of Formation Pressure on Time-Lapse Seismic Monitoring in Marine Carbon Dioxide Storage
The AVO Effect of Formation Pressure on Time-Lapse Seismic Monitoring in Marine Carbon Dioxide Storage
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The phase change of CO2 has a significant bearing on the siting,injection,and monitoring of storage.The phase state of CO2 is closely related to pressure.In the process of seismic exploration,the information of formation pressure can be response in the seismic data.Therefore,it is possible to monitor the formation pressure using time-lapse seismic method.Apart from formation pressure,the information of porosity and CO2 saturation can be reflected in the seismic data.Here,based on the actual situation of the work area,a rockphysical model is proposed to address the feasibility of time-lapse seismic monitoring during CO2 storage in the anisotropic formation.The model takes into account the formation pressure,variety minerals composition,fracture,fluid inhomogeneous distribution,and anisotropy caused by horizontal layering of rock layers(or oriented alignment of minerals).From the proposed rockphysical model and the well-logging,cores and geological data at the target layer,the variation of P-wave and S-wave velocity with formation pressure after CO2 injection is calculated.And so are the effects of porosity and CO2 saturation.Finally,from anisotropic exact reflection coefficient equation,the reflection coefficients under different formation pressures are calculated.It is proved that the reflection coefficient varies with pressure.Compared with CO2 saturation,the pressure has a greater effect on the reflection coefficient.Through the convolution model,the seismic record is calculated.The seismic record shows the difference with different formation pressure.At present,in the marine CO2 sequestration monitoring domain,there is no study involving the effect of formation pressure changes on seismic records in seafloor anisotropic formation.This study can provide a basis for the inversion of reservoir parameters in anisotropic seafloor CO2 reservoirs.
Time-lapse seismic monitoringMarine carbon dioxide storageAVO modelingFormation pressureAnisotropicRockphysical model
Fan Wu、Qingping Li、Yufa He、Jingye Li
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Beijing Huairou Laboratory,Beijing 101499,China
China National Offshore Oil Corporation Research Institute Co.Ltd,Beijing 100027,China
China University of Petroleum(Beijing),Beijing 102249,China
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