Analisis Potensi Hidrokarbon dan Perhitungan Cadangan Oil Current Lapisan M1 dan M2 pada Formasi W Sumur AP#1 Lapangan Lirik

Abdurrahman, Muslim and Umar, Mursyidah and Anilgie, Pratama Analisis Potensi Hidrokarbon dan Perhitungan Cadangan Oil Current Lapisan M1 dan M2 pada Formasi W Sumur AP#1 Lapangan Lirik. Jurnal Mineral, Energi dan Lingkungan, 2 (1). pp. 38-49. ISSN 2549-564X

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Abstract

AP#1 well located in W Formation at Lirik Field and has been produced since 1975. As time goes by, the production of AP#1 well which located at G1, G2, G3 sand are no longer economically produced because the water cut is at 100%. M1 and M2 sand are the productive candidates to do new zone behind pipe (NZBP) as workover operation. RST log interpretation used as reference in the proposed sand, which contain hydrocarbon. However, to maximize the result and to make it more convincing about the current oil reserve at these sands, it is necessary to analyze the hydrocarbon potential. Hydrocarbon potential analysis done by using Simandoux Model and RST log. Meanwhile, the oil residual saturation (Sor) obtained from special core analysis (SCAL) and then, RST log used to calculate a more current oil reserve. The analysis result at M1 sand, initial oil saturation (Soi) at 67% and current oil saturation (So) at 37.6%. Current oil saturation (So) corresponds to the actual well condition and above the residual oil saturation (Sor), which is at 22% with the movable hydrocarbon index (MVI) is (0.686) < 0.7 so, M1 sand still has potential to be produced. The result of M2 sand are, Soi is at 29.8%, So at 38.4%. Current oil saturation (So) is not correspond to the actual condition and if we see from the initial oil saturation (Soi) at 29.8% it is close to residual oil saturation (Sor), which is at 22% and the initial MHI is (0.753) > 0.7 so, M2 sand has less potential to be produced. The result of oil current reserve calculation at M1 sand obtained, recovery factor (RF) at 41.4% so, the volumetric recoverable oil reserves (Nr) is 67 MSTB and for M2 sand obtained RF at 42.8% and Nr is 94 MSTB.

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