Volume 46 Issue 3
Jun.  2018
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LANG Yuquan, CHEN Tongjun, MA Li, MA Guodong. Water content prediction of roof sandstone using AVO technology[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(3): 127-132. DOI: 10.3969/j.issn.1001-1986.2018.03.021
Citation: LANG Yuquan, CHEN Tongjun, MA Li, MA Guodong. Water content prediction of roof sandstone using AVO technology[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(3): 127-132. DOI: 10.3969/j.issn.1001-1986.2018.03.021
shu

Water content prediction of roof sandstone using AVO technology

  • 1. Research Institute of Coal Exploration of China National Administration of Coal Geology, Zhuozhou 072750, China;

  • 2. Key Laboratory of CBM Resource & Reservoir Formation Process, Ministry of Education, Xuzhou 221008, China;

  • 3. School of Resource and Earth Science, China University of Mining and Technology, Xuzhou 221116, China;

  • 4. Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Land and Resources, Xi'an 710021, China

Funds: 

National Natural Science Foundation of China(41774128,41374140)

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  • Received Date: November 20, 2017
  • Published Date: June 24, 2018
    Graphical Abstract
    • Abstract
  • The purpose of this research is to discuss the water content prediction of roof sandstone using Gassmann equation and AVO(Amplitude Variation with Offset) modelling. First of all, we calculate P-velocities, porosities and clay contents using actual well logs as inputs. Then, we fit the P-velocity of sandstone matrix with Han's empirical equation. After that, we calculate the S-velocity of sandstone matrix and build 14 sandstone models to calculate corresponding velocities and densities following Gassmann's workflow. Finally, we calculate the AVO responses of roof sandstones with Zoeppritz equation. The results show the cross plot between intercept(P) and gradient(G) can differentiate roof sandstone with different porosity and wettability. In summary, AVO technology is a useful tool to predict water content of roof sandstone.
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    • References (23)
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