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SYAFRIEL IRYANSYAH CHANIAGO

NIM

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Abstrak (Bhs. Indonesia)

Cekungan Laut Timor merupakan salah satu cekungan hidrokarbon prospektif di Indonesia. Namun, beberapa sumur eksplorasi, yaitu Banli-1, Belalang-1, Manta-1, Mina-1, dan Napoleon-1, belum berhasil menemukan akumulasi hidrokarbon yang bernilai ekonomis. Penelitian ini bertujuan untuk mengetahui sistem petroleum yang berkembang dan menganalisis penyebab kegagalan sumur pemboran melalui pendekatan analisis post mortem. Metode yang digunakan meliputi analisis geokimia menggunakan data Total Organic Carbon (TOC) dan Rock-Eval Pyrolysis, serta interpretasi seismik 2D dan Depth Structure Map (DSM). Hasil penelitian menunjukkan bahwa batuan induk terdiri atas Jurassic Wailuli, Triassic Mt. Goodwin, dan Triassic Sahul Group dengan kandungan material organik berkisar 0,61–2,68 wt.% TOC, didominasi oleh kerogen Tipe III dan sebagian Tipe II/III, serta tingkat kematangan termal yang masih didominasi immature hingga immature–mature. Reservoir utama berupa Jurassic Oebaat, Jurassic Plover, dan Triassic Challis memiliki kualitas yang bervariasi. Batuan penutup regional berupa Cretaceous Nakfunu dan Cretaceous Bathurst Island Group (Wangarlu–Echuca Shoals) memiliki Sealing Number >1 sehingga berfungsi sebagai regional seal yang efektif. Jalur migrasi berkembang melalui sesar dan mekanisme updip migration, sedangkan perangkap utama berupa horst-related anticline. Berdasarkan hasil evaluasi, kegagalan sumur pemboran terutama disebabkan oleh keterbatasan hydrocarbon charge akibat batuan induk yang belum matang, kualitas reservoir yang kurang baik pada sebagian besar sumur, serta ketidaktepatan penempatan target pemboran pada Sumur Banli-1 yang berada pada bagian flank struktur sehingga tidak memotong closure perangkap hidrokarbon.

Abtrak (Bhs. Inggris)

The Timor Sea Basin is one of the prospective hydrocarbon basins in Indonesia. However, several exploration wells, namely Banli-1, Belalang-1, Manta-1, Mina-1, and Napoleon-1, have not succeeded in finding economically valuable hydrocarbon accumulations. This study aims to evaluate the Sistem petroleum and analyze the causes of drilling well failures through a post-mortem well analysis approach. The methods used include geochemical analysis using Total Organic Carbon (TOC) and Rock-Eval Pyrolysis data, as well as 2D seismic interpretation and Depth Structure Map (DSM). The results show that the source rocks consist of the Jurassic Wailuli, Triassic Mt., and Triassic Sahul Group  with organic material content ranging from 0.61–2.68 wt.% TOC, dominated by Type III kerogen and some Type II/III, and the thermal maturity level is still dominated by immature to immature–mature. The main reservoirs consist of Jurassic Oebaat, Jurassic Plover, and Triassic Challis, each with varying quality. The regional cap rock, the Cretaceous Nakfunu and the Cretaceous Bathurst Island Group (Wangarlu–Echuca Shoals), has a Sealing Number >1, thus serving as an effective regional seal. The migration pathway develops through faults and updip migration mechanisms, while the main trap is a horst-related anticline. Based on the evaluation results, the failure of drilling wells was mainly caused by limited hydrocarbon charge due to immature source rocks, poor reservoir quality in most wells, and inaccurate drilling target placement in the Banli-1 Well, which is located on the flank of the structure, thus not intersecting the closure of the hydrocarbon trap.

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