Update Artikelilmiah: 49660

AMALI RISNA VASANDANI

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Abstrak (Bhs. Indonesia)

Blok Kolbano merupakan bagian dari Kawasan Timur Indonesia (KTI) yang memiliki potensi hidrokarbon signifikan, khususnya pada Cekungan Timor. Namun, masih terdapat perbedaan interpretasi mengenai zona prospektif di sekitar Sumur Banli-1, yang dilaporkan sebagai dry hole dan berstatus plugged and abandoned. Penelitian ini bertujuan mengidentifikasi potensi hidrokarbon melalui integrasi data log sumur, analisis geokimia, dan Passive Seismic Tomography (PST). Berdasarkan analisis log, zona prospektif ditemukan pada Formasi Plover (litologi batupasir, batulempung, batulanau, dan batugamping), Formasi Oebaat (batupasir), serta Formasi Nakfunu (batugamping radiolaria dan batulempung). Analisis geokimia menunjukkan keberadaan batuan induk dengan nilai Total Organic Carbon (TOC) berkisar antara kategori baik hingga sangat baik, bertipe kerogen III (gas-prone), namun belum matang (immature). Dengan demikian, meskipun kualitas organik cukup baik, batuan induk ini belum memasuki jendela kematangan, sehingga potensi hidrokarbon utama kemungkinan berada pada kedalaman yang lebih besar. Analisis PST mengidentifikasi zona anomali di bagian utara-barat laut area studi dengan nilai Vp < 4,5 km/s dan ratio Vp/Vs < 1,70, yang diasosiasikan dengan keberadaan gas dalam litologi batugamping dan batupasir. Integrasi ketiga metode, yang diperkuat data geologi regional, menunjukkan sistem petroleum aktif dengan potensi perangkap hidrokarbon pada zona berpermeabilitas tinggi yang tertutup oleh batuan impermeabel.

Abtrak (Bhs. Inggris)

The Kolbano Block is part of Eastern Indonesia (KTI) and holds significant hydrocarbon potential, particularly within the Timor Basin. However, there are still differing interpretations regarding the prospective zones around the Banli-1 Well, which has been reported as a dry hole and is currently plugged and abandoned. This study aims to identify hydrocarbon potential through the integration of well log data, geochemical analysis, and Passive Seismic Tomography (PST). Based on log analysis, prospective zones were identified within the Plover Formation (lithologies of sandstone, claystone, siltstone, and limestone), the Oebaat Formation (sandstone), and the Nakfunu Formation (radiolarian limestone and claystone). Geochemical analysis indicates the presence of source rocks with Total Organic Carbon (TOC) values ranging from good to very good, kerogen type III (gas-prone), but in an immature stage. Although the organic quality is relatively good, the source rocks have not yet entered the maturity window, suggesting that the main hydrocarbon potential likely occurs at greater depths. PST analysis identified anomalous zones in the northern–northwestern part of the study area with Vp values < 4.5 km/s and Vp/Vs ratios < 1.70, which are associated with the presence of gas in limestone and sandstone lithologies. The integration of these three methods, supported by regional geological data, indicates an active petroleum system with potential hydrocarbon traps in high-permeability zones sealed by impermeable rocks.

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