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| | 講演要旨(英文) | | Based on Gas Content and Proximity data analysis from three (3) CBM exploration-core wells, the coal seams group of the Balikpapan Formation in the study area has different characteristic in term its relationship between Gas Content and inorganic content value. Toward the North-West area of the field, the Gas Content tends to significantly increase not in linear relationship, especially in coal seams group of Zone-4 (Lower Balikpapan Fm.). This anomaly of rapid increase in Gas Content has made the cross plot relationship between Gas Content and Inorganic Content is no longer in linear relationship but it tend to be logarithmic relationship with significant increase of "pure coal" Gas Content value which is 450 scf/t. By establishing the cross plot of Moisture Content versus Depth (all observed wells) then compared to the theoretical cross plot of Shurman's Rule (Van Krevelen, 1993), it shows a unique result, that toward the North-West area, the value of Moisture Content and its trend is constantly decreasing. The coal seams of the study area tend to undergo the dehydration process toward the North-West area where the formation uplifting more extensive and local intrusion of Pinang Dome existed. In conclusion, the coal dehydration may caused by extensive formation uplifting and local heating from Pinang Dome Intrusion, and it gives significant increase to the Gas Content value in the North-West area of study area. |
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