Pemodelan dan Estimasi Potensi Batubara menggunakan Inverse Distance Weighting (IDW) berdasarkan Data Geologi Permukaan dan Pemboran di Daerah Batang Gangsal, Riau
DOI:
https://doi.org/10.30872/kge58654Keywords:
Pemodelan, Total Inventori, Batubara, Inverse Distance Weighting (IDW), Batang GangsalAbstract
Batubara tetap menjadi sumber energi primer penting, meskipun pergeseran kebijakan energi nasional menuju energi baru terbarukan telah menurunkan pemanfaatannya. Data potensi batubara di Provinsi Riau, termasuk daerah Batang Gansal, masih terbatas dan jarang diperbarui melalui pemodelan tiga dimensi, sehingga kajian ini relevan untuk melengkapi basis data sumber daya batubara nasional yang cenderung stagnan. Penelitian ini memodelkan dan mengestimasi potensi batubara di daerah Batang Gansal, Kabupaten Indragiri Hulu, Provinsi Riau, menggunakan metode Inverse Distance Weighting (IDW), berdasarkan pemetaan geologi permukaan, pengeboran eksplorasi, analisis laboratorium, dan pemodelan tiga dimensi. Batubara dijumpai pada Formasi Lakat (Bekasap) berumur Oligosen–Miosen Awal, dengan ketebalan lapisan 0,14–2,07 m pada tujuh seam (A–G), di mana Seam A memiliki sebaran dan ketebalan terbesar. Pemodelan IDW (power = 2, radius = 3.000 m, isotropik) menghasilkan block model dan solid model sebagai dasar estimasi volume dan tonase batubara. Berdasarkan SNI 5015:2019, total potensi batubara mencapai 35,14 juta ton (20,35 juta tereka, 8,67 juta tertunjuk, 6,12 juta terukur), dengan nilai kalori 1.668–7.289 kal/g adb. Hasil ini menegaskan potensi batubara Batang Gansal yang signifikan serta menunjukkan bahwa integrasi data permukaan dan bawah permukaan melalui pemodelan IDW merupakan pendekatan efektif untuk evaluasi sumber daya batubara, sekaligus menjadi acuan awal bagi industri dan pemerintah daerah dalam menentukan prioritas eksplorasi dan pengelolaan sumber daya di Riau.
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