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Fractured Basement Characterization and Its Relation to Production Zone Potential in Southern Sumatra Basin, Indonesia
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 6th EAGE Saint Petersburg International Conference and Exhibition, Apr 2014, Volume 2014, p.1 - 5
Abstract
PT. PERTAMINA EP in 2009 drilled AXL-1 in South Sumatra Basin and discovered oil in Pre-Tertiary Quartzite at AXL Area, South Sumatra, Indonesia. The well was drilled and reached Quartzite basement at 2254 mMD with no indication of hydrocarbon based on gas reading but after 204 m, total gas suddenly reached 1401 unit with hydrocarbon indication from nC1 up to nC5 at 2458 mMD and subsequently crude oil was bleeding in the shale shaker and flowed oil up to 320 BOPD. Geological and Geophysical analysis were conducted and modeled to characterize fractured basement reservoir in the Pre-Tertiary rocks in the AXL area related to its production zone potential. Fractured basement lithology in the AXL area is quartzite with volcanic mineral exist and minor secondary mineral which indicated fluid flow in the reservoir. Faults and micro-faults were observed and demonstrate dominant NE-SW strike with abundant conductive fractures with strike dominant NE-SW with minor NW-SE. Based on integrated fracture analysis in AXL area, production hydrocarbon potential zone along the basement section maybe related to multiple fracture orientation which build a fracture network for fluid to flow and it is related to the fault system in the Pre-Tertiary basement rock.