摘要：Seismic AVO has a significant potential for fluid identification in time-lapse monitoring of the cyclic recovery of geothermal res
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THERMO-POROELASTIC AVO MODELING OF OLKARIA GEOTHERMAL RESERVOIRS
作者：Wang, Zhiwei
来源：GEOENERGY SCIENCE AND ENGINEERING, 2024, Volume 241.
滑动阅读摘要
Seismic AVO has a significant potential for fluid identification in time-lapse monitoring of the cyclic recovery of geothermal reservoirs. With this goal, we develop an AVO method based on the reflection and transmission (R/T) of elastic waves at an interface between two fluid-saturated thermo-poroelastic media. The method is applied to the Olkaria geothermal reservoir modeling in Kenya. This system is characteristic of a natural cyclic recovery, where cyclic meteoric water undergoes complex phase transition and thermo-hydro-mechanical coupling process. Conceptual models are built based on petrophysical and thermophysical properties of trachyte thermal reservoirs, and the fluid properties under different temperature conditions have been considered. A plane-wave analysis illustrates the effects of thermal conductivity, specific heat, and porosity on velocity dispersion and attenuation of the fast-P, Biot P, and thermal P waves. AVO modeling by P-wave incidence is conducted to investigate the effects of temperature, porosity, and fluid type on the R/T coefficients. For trachyte reservoirs with a temperature less than 500 degrees C, limited changes in the thermophysical properties have negligible effects on wave propagation, whereas significant effects are due to temperature, porosity, and fluid type. Synthetic seismogram also indicates that the thermo-poroelastic effect noticeable changes the seismic responses compared with the traditional elastic and thermoelastic models. The thermo-poroelastic AVO method proposed in this paper reveals the variation of R/T coefficients of geothermal reservoirs under different conditions. The results can be used as a precursor to geothermal reservoir monitoring, fluid leakage or short circuits.
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