Pemanfaatan Sumur Uji Sintetis Pada Simulasi Numerik Untuk Studi Awal Potensi Penyimpanan Karbon di Sistem Panas Bumi Gunung Rajabasa
DOI:
https://doi.org/10.56099/ophi.v8i1.p43-56Kata Kunci:
sumur uji sintetis, simulasi numerik, penyimpanan karbon, reservoar panas bumi, Gunung RajabasaAbstrak
Eksplorasi panas bumi di Gunung Rajabasa telah melalui berbagai tahapan, namun hingga saat ini belum tersedia sumur eksplorasi dalam yang menjadi kendala dalam karakterisasi reservoir untuk studi awal penyimpanan karbon. Penelitian ini bertujuan untuk mendapatkan karakteristik reservoir panas bumi berdasarkan sumur uji sintetis pada simulasi numerik serta menghitung potensi awal penyimpanan karbon di sistem panas bumi Gunung Rajabasa. Pemodelan numerik dilakukan menggunakan perangkat lunak HYDROTHERM dengan menerapkan metode finite-difference dan algoritma Newton-Raphson hingga mencapai kondisi steady-state, yang divalidasi dengan data sumur eksplorasi dangkal RJB-1A. Tiga sumur uji sintetis (DWR-1, DWR-2, DWR-3) ditempatkan pada model untuk menganalisis profil suhu dan tekanan guna menentukan zona steam cap dan batas reservoir. Hasil pemodelan menunjukkan bahwa reservoir panas bumi Gunung Rajabasa memiliki dimensi panjang sekitar 4 km dengan ketebalan 2 km, top reservoir pada kedalaman 700–1200 m, serta rentang suhu fluida reservoir antara 286–337°C. Perhitungan awal potensi penyimpanan karbon menggunakan metode volumetrik menghasilkan kapasitas massa CO₂ sebesar 1,185 Mt CO₂e dengan asumsi injeksi dalam fase terlarut pada suhu 155°C dan tekanan 20 bar. Temuan ini mengindikasikan bahwa sistem panas bumi Gunung Rajabasa memiliki potensi awal untuk penyimpanan karbon, meskipun masih diperlukan pengembangan model pada lintasan lain serta kajian lebih lanjut mengenai laju injeksi dan perilaku fluida CO₂ di dalam reservoir.
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