Geomechanics and Engineering

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A rock physical approach to understand geo-mechanics of cracked porous media having three fluid phases

  • Ahmad, Qazi Adnan (Department of Geology and Geophysics, Bacha Khan University Charsadda) ;
  • Wu, Guochen (China University of Petroleum (East China), School of Geoscience Qingdao) ;
  • Zong, Zhaoyun (China University of Petroleum (East China), School of Geoscience Qingdao) ;
  • Wu, Jianlu (China University of Petroleum (East China), School of Geoscience Qingdao) ;
  • Ehsan, Muhammad Irfan (Institute of Geology University of the Punjab) ;
  • Du, Zeyuan (China University of Petroleum (East China), School of Geoscience Qingdao)
  • Received : 2019.10.21
  • Accepted : 2020.10.26
  • Published : 2020.11.25
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Abstract

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.

Keywords

Acknowledgement

We would like to acknowledge the sponsorship of National Science and Technology Major Project (2016ZX05024-001-008).

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