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The Determination of Economic Basement of Rock Formation in Exploring the Langkat–Medan Area, North Sumatra Basin
Exploration drilling in the Langkat–Medan area, North Sumatra Basin, has proved oil and gas potential in the Belumai Formation. Drilling also penetrated the Pre Belumai sequence of so-called "Basal Sandstone".
The evaluation of data on hand shows that the possibility of favourable reservoirs is limited to the Belumai Formation.
Pre-Belumai rocks, especially the "Basal Sandstone" were strongly affected by diagnesis and consequently are very low porosity reservoirs. Exploration efforts should therefore be limited to the interval above the base of Belumai Formation and the Pre-Belumai section should be considered as "economic basement". Geological correlation based on well data and outcrop sections shows that the "Basal Sandstone" is Pre Tertiary rock belonging to the Kualu Formation.
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