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Geomechanics and Engineering
  Volume 23, Number 4, November25 2020 , pages 327-338

A rock physical approach to understand geo-mechanics of cracked porous media having three fluid phases
Qazi Adnan Ahmad, Guochen Wu, Zhaoyun Zong, Jianlu Wu, Muhammad Irfan Ehsan and Zeyuan Du

    The role of precise prediction of subsurface fluids and discrimination among them cannot be ignored in reservoir characterization and petroleum prospecting. A suitable rock physics model should be build for the extraction of valuable information form seismic data. The main intent of current work is to present a rock physics model to analyze the characteristics of seismic wave propagating through a cracked porous rock saturated by a three phase fluid. Furthermore, the influence on wave characteristics due to variation in saturation of water, oil and gas were also analyzed for oil and water as wet cases. With this approach the objective to explore wave attenuation and dispersion due to wave induce fluid flow (WIFF) at seismic and sub-seismic frequencies can be precisely achieved. We accomplished our proposed approach by using BISQ equations and by applying appropriate boundary conditions to incorporate heterogeneity due to saturation of three immiscible fluids forming a layered system. To authenticate the proposed methodology, we compared our results with White's mesoscopic theory and with the results obtained by using Biot's poroelastic relations. The outcomes reveals that, at low frequencies seismic wave characteristics are in good agreement with White's mesoscopic theory, however a slight increase in attenuation at seismic frequencies is because of the squirt flow. Moreover, our work crop up as a practical tool for the development of rock physical theories with the intention to identify and estimate properties of different fluids from seismic data.
Key Words
    exploration geophysics; mathematical geophysics; seismic methods; seismology; waves and wave analysis; geomechanics measurements and monitoring
Qazi Adnan Ahmad: 1.) Department of Geology and Geophysics, Bacha Khan University Charsadda, KPK, Pakistan
2.) China University of Petroleum (East China), School of Geoscience Qingdao, Shandong, 266555, China

Guochen Wu, Zhaoyun Zong, Jianlu Wu and Zeyuan Du: China University of Petroleum (East China), School of Geoscience Qingdao, Shandong, 266555, China

Muhammad Irfan Ehsan: Institute of Geology University of the Punjab, Lahore 54590, Pakistan

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