ABSTRAK
Meningkatnya kebutuhan konsumsi minyak dan gas membuat Indonesiaketergantungan akan transaksi impor minyak mentah terhadap Negara lain. Haltersebut disebabkan oleh menurunnya tingkat produksi minyak mentah dalamnegeri, sehingga kebutuhan bahan bakar minyak tidak dapat terpenuhi meskipunbeberapa wilayah di Indonesia memiliki potensi tersebut. Terdapat beberapawilayah yang berpotensi memiliki sumber cadangan minyak mentah, dimana salahsatunya berada di wilayah perairan Laut Arafuru. Namun, ketersediaan alat yangsesuai, menjadi salah satu masalah yang perlu ditangani. Semi-submersible OilRig Platform, merupakan jenis platform yang sesuai. Peneliti melakukanperancangan desain dan menyesuaikan dengan lingkungan Laut Arafuru yangberpotensi memiliki 24.36 MMSTB cadangan minyak mentah. Peneliti jugamelakukan analisis Loads and Responses , analisis Response Amplitude Operator(RAO) serta melakukan analisis pemilihan Mooring Lines. Sehingga kapabilitasSemi-submersible Platform sesuai dengan lingkungan Laut Arafuru dankebutuhan minyak mentah Indonesia dapat terpenuhi tanpa harus melakukantransaksi impor ke negara lain.

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ABSTRACT
The increasingly of oil and gas consumption , make Indonesia dependenceto crude oil import transaction with another country. That is caused bydecreasingly crude oil production which is the impact of this goes to necessity ofoil and gas consumption that can?t to be fulfilled. Although, some of territory ofIndonesia have a potential of it. There are some territories which are potentiallyhave crude oil resources. And, Arafuru Ocean area is one of them. But, readinessof appropriate tools, is the one of problem that have to be fixed. Semi-submersibleOil Rig Platform is the one of appropriate Platform. So, the researcher make apreliminary design of platform by adjusting the platform that suits with theenvironmental of Arafuru Ocean which is potentially have 24.36 MMSTB ofcrude oil. Researcher also analyze the Loads and Responses the ResponseAmplitude Operator (RAO) and analyzing Mooring Lines Type that have to bechoose. With the result of that, the capability of Semi-submersible Platform willsuit with the environmental of Arafuru Ocean and the necessity of crude oil willbe fulfill without doing import transaction with another country.