FRACTURE CHARACTERIZATION USING IMAGE LOG ON FRACTURED BASEMENT RESERVOIR IN JABUNG BLOCK, SOUTH SUMATRA BASIN
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Abstract
Exploration of fractured basement has turned out to be a particular interest in the oil and gas industry. In the Jabung block in the South Sumatra sub-basin, the basin experiences tectonics with extensional phases and also experiences compressional phases caused by strike-slip fault and becomes inversion tectonic. This tectonic event makes this research area interesting because the basement in the block is affected by the two tectonic phases. Basement analysis was then carried out to look for new sources of hydrocarbons in the fractured basement. The analysis carried out is an analysis of well log data to find the porosity found in the basement. Then the results of the analysis are validated with log images in recording the fractures contained in the basement. Then the dominant direction of the fracture will be obtained in making a stereonet which is then combined with the Mohr diagram which is useful for knowing critical fractures. Geomechanical analysis of pore pressures is also carried out to provide information that can be used to determine the tectonic effect on the well. From all the results of this analysis it can be concluded that the basement fractured in the Jabung Block can be identified as good reservoir or not.
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