Perhitungan cadangan batubara penting dalam eksplorasi untuk menentukan kelayakan ekonomi dari penambangan. Hasil perhitungan cadangan penambangan kemudian digunakan untuk mengevaluasi apakah kegiatan penambangan yang direncanakan layak atau tidak. Studi ini berlokasi di wilayah Muarabungo di cekungan Sumatra Selatan. Secara fisiografis Cekungan Sumatra Selatan adalah Cekungan Tersier. Dalam penelitian ini digunakan Metode Nearest Neigbour Point, Metode Inverse Distance Weighting dan Metode Kriging untuk mengetahui sumber daya batubara. Hasil perhitungan cadangan batubara pada Metode Nearest Neigbour Point diperoleh volume batubara 458.240 m3, dengan tonase 960.929,28 ton, volume overburden 3.735.200 m3, dan rasio nilai pengupasan 1:3,887. Dalam metode pembobotan jarak terbalik Inverse Distance Weighting 967.386 ton, overburden 3.826.800 m3, dan stripping ratio 1:3.955. Sedangkan dalam Metode Kriging, volume batubara adalah 446.760 m3, dengan tonase 967.386 ton, overburden 3.908.600 m3, dan stripping ratio 1: 4.166.
Determination of the location of the hypocenter is very necessary to monitor the potential for seismic hazard. Positioning and seismic energy can help safety workers determine which areas can be mined or temporarily halted. Earthquakes in underground mines are caused by seismic induction due to mining activities such as blasting processes, hydrofracturing, vehicle activities, etc. Earthquakes that occur are generally clustering. Earthquake events generally occur in mine openings, this is caused by mass compensation taken. The data used in this study are synthetic micro-earthquake data around the mining area. To obtain a high level of accuracy and precision, especially in determining the location and depth in determining the hypocenter using the Double-Difference (DD) method. The results of the microseismic relocation in the study area are well covered, as evidenced by the residual histogram and shift distribution. The shift of the microseismic before and after being relocated spread in all directions with the dominant direction in the NE – SW direction. The value of the microseismic shift before and after being relocated ranged from 0.5 meters to 150 meters.
The interest of this research: there is oil seepage at the contact between coal seam-A and sandstone facies of Warukin Formation, so it is necessary to study where is the source rock. The correlation between HI and Tmax as result from rock eval pyrolysis shows that the shale of the Warukin Formation is immature while the correlation between HI and OI shows oil prone. The vitrinite (Ro) reflectance of Central Wara coal is between 0.48% up to 0.5% (immature), the content of the vitrinite group is 68.0-84.8 (% Vol.), Liptinite 3.0-14.0 (% Vol.) and inertinite 0.48-25.0 (% Vol.). The high content of liptinite mineral groups (14% Vol.) and the presence of exsudatinite maceral are as an initial indication of bitumenization of oil formation when there is a change in reflectance and fluorescence. Therefore, Central Wara coal plays an important role as the source rock of the Warukin Formation, although the maturity level is immature, the presence of exsudatinite maceral is believed to be the source of origin for producing oil, where the organic material comes from terrestrial.
Gravity method is a passive geophysical method that provides information on the distribution of rock density below the surface. The gravity method has a weakness at the level of ambiguity in determining the depth of the anomaly. This study aims to determine the depth of the anomaly using Continuous Wavelet Transform (CWT) analysis to overcome the value of ambiguity, so that the results obtained have a high degree of accuracy. The research method is data survey / acquisition and data analysis. This research was conducted in Karangsambung Kebumen, Central Java with the acquisition of gravitational data as many as 56 measurement points. The results of data acquisition then analyzed included reading to mGal, tool height correction, drift, tides, latitude, free air correction, Bouguer correction, and field correction. The results of this correction obtained Complete Bouguer Anomalies (ABL) values which were then reduced to flat fields and regional-residual anomaly filters. The next step is CWT analysis by making incisions on residual anomaly maps. The results showed that the source of the anomaly was between ± 39.2 - 122.9 meters.
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