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<p>Recent years, domestic and foreign scholars have done a lot of exploration and practice on seismic prediction methods of the gas content of the coalbed. Amplitude variation with offset (AVO) analysis technique can be applied to the coalbed gas, but it is different from the “established conclusion” of conventional natural gas. Take K area as an example, Modulus attributes and density of the coalbed are sensitive to coalbed gas through petro-physical analysis. That means the higher the gas content, the lower the modulus property and density value, moreover, the negative correlation between gas content and modulus attributes is more obvious. Through AVO forward modeling analysis, 8+9# coalbed in K area shows the type IV of AVO abnormal characteristics, and high gas content corresponds to strong abnormal, low gas content corresponds to weak abnormal. AVO attribute of “A-B” can predict the gas content of 8+9 coalbed in K area, which shows good application effect.</p>

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Application of Amplitude Variation with Offset Analysis Technique on Predicting the Gas Content of the Coalbed

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • Chen Silu,
  • Wang Cunwu,
  • Han Gang,
  • Qi Yu,
  • Deng Jimei

摘要

Recent years, domestic and foreign scholars have done a lot of exploration and practice on seismic prediction methods of the gas content of the coalbed. Amplitude variation with offset (AVO) analysis technique can be applied to the coalbed gas, but it is different from the “established conclusion” of conventional natural gas. Take K area as an example, Modulus attributes and density of the coalbed are sensitive to coalbed gas through petro-physical analysis. That means the higher the gas content, the lower the modulus property and density value, moreover, the negative correlation between gas content and modulus attributes is more obvious. Through AVO forward modeling analysis, 8+9# coalbed in K area shows the type IV of AVO abnormal characteristics, and high gas content corresponds to strong abnormal, low gas content corresponds to weak abnormal. AVO attribute of “A-B” can predict the gas content of 8+9 coalbed in K area, which shows good application effect.