Sedimentary controls of coalbed methane accumulation and predictionof favorable area in the BD area，eastern margin of Ordos Basin
Received date: 2015-06-19
Revised date: 2015-08-26
Online published: 2016-02-10
Based on the well and 3D seismic data in BD area of eastern Ordos Basin,combined with the geology theory and method of sedimentology and sequence stratigraphy,the basic geological conditions and sedimentary controls of coalbed methane（CBM） accumulation were analyzed,and the prediction for favorable area of CBM was made based on the geophysical technique.The research results indicate that BD CBM block has good geological conditions with simple structure,moderate burial depth,good physical reservoir,weak destruction,strong save ability,high gas content and high groundwater salinity.The Sedimentary control function of CBM enrichment was discussed on the basis of the sequence stratigraphy division.It can be concluded from the research that the distribution of coal seam is controlled by sequence stratigraphic framework,the characteristic of coal reservoir is controlled by coaldepositional environment,the surrounding rock of CBM reservoir is controlled by sedimentary system.Based on the analysis of sedimentary controlling factor,we predict for CBM rich region in BD south 3 dimensional area through multisource information fusion methods.Verified by subsequent drilling,the wells in this place have good effects,which is currently the highest gas production part in BD block.The multisource information fusion methods provide reference for foreasting in similar coalbed methane favorable areas,because the scope of prediction and actual drilling results are closely.
Wang Zhe，Xu Ligui，Fu Jing，Liu Yanna . Sedimentary controls of coalbed methane accumulation and predictionof favorable area in the BD area，eastern margin of Ordos Basin[J]. Natural Gas Geoscience, 2016 , 27(2) : 387 -396 . DOI: 10.11764/j.issn.16721926.2016.02.0387
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