Abstract
In eastern Ordos basin, CBM (Coalbed Methane) has broad prospects for exploration and development. Due to the great p-impedance difference between the coal seam and surrounding rock, the seismic reflection of coal seam is low-frequency, continuous and strong-amplitude, so it is difficult to predict the CBM. Multi-parameter petrophysical crossplot analysis technology reduces the multi-resolution of single parameter prediction of CBM reservoir, which is the basis of quantitative description of CBM reservoir; Coal Seam Thickness Prediction Technology is carried on to predict the distribution of coal seam thickness with high prediction accuracy. The forward modeling shows that the roof reflection of coalbed methane reservoir performances for the AVO Class IV. But the velocity of surrounding rock brings AVO curve changes. Pre-stack AVA simultaneous inversion can obtain high-precision elastic parameter volumes, and λ * ρ is most sensitive to coalbed methane. Therefore, AVO feature and λ * ρ from AVA pre-stack inversion can predict CBM quantitatively. The technical method in this paper has been applied to Block H in eastern Ordos basin with good results.
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Zhang, Lk., Guo, Yb., Li, X., Li, Jf., Gao, Q., Luo, Wl. (2021). Research and Application of Quantitative Prediction Technology for Coalbed Methane in the Eastern Ordos. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2020. IFEDC 2020. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-0761-5_179
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DOI: https://doi.org/10.1007/978-981-16-0761-5_179
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