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Simulation of 3D Gravity Anomaly of Thin Coal Layer in Sedimentary Environment and its Delineation

Hendra Grandis


We investigate the possibility of application of the gravity method to delineate a typical coal-bed methane (CBM) bearing formation. We simulate gravity data corresponding to a realistic 3D gravity model associated with a thin coal layer in a sedimentary environment. The separate and combined gravity effects of the regional component and the coal layer were calculated by using gravity forward modeling with FFT algorithm. Several filtering and anomaly enhancement techniques were applied to the simulated gravity anomaly to delineate the presence of the coal layer. Only lateral extent of the anomalous sources may be detected. Difficulties in extracting detailed parameters of the anomalous sources are mainly related to the anomaly magnitude that is very small.


Coal, CBM, gravity anomaly, filtering, enhancement, trend surface fitting.

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