Journal
ACTA GEOPHYSICA
Volume 65, Issue 2, Pages 345-351Publisher
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.1007/s11600-017-0027-8
Keywords
Coalbed methane occurrence; 3D seismic information; Geological conditions; Geological factors
Categories
Funding
- Fundamental Research Funds for the Central Universities [2015QNB19]
- National Natural Science Foundation of China [41430317]
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The research on geological conditions of coalbed methane (CBM) occurrence is of great significance for predicting the high abundance CBM rich region and gas outburst risk area pre-warning. The No. 3 coal seam, in Yangquan coalfield of Qinshui basin, is the research target studied by 3D seismic exploration technique. The geological factors which affect CBM occurrence are interpreted based on the 3D seismic information. First, the geological structure (faults, folds, and collapse columns) is found out by the 3D seismic structural interpretation and the information of buried depth and thickness of the coal seam is calculated by the seismic horizons. Second, 3D elastic impedance (EI) and natural gamma attribute volumes are generated by prestack EI inversion and multi-attribute probabilistic neural network (PNN) inversion techniques which reflect the information of coal structure types and lithology of the roof and floor. Then, the information of metamorphic degree of seam and hydrogeology conditions can be obtained by the geological data. Consequently, geological conditions of CBM occurrence in No. 3 coal seam are evaluated which will provide scientific reference for high abundance CBM rich region prediction and gas outburst risk area pre-warning.
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