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ABSTRAK Lapangan X merupakan lapangan baru dan hanya memiliki satu existing well yaitu sumur X-1. Sumur ini belum berproduksi sehingga tidak ada data produksi dari Lapangan X. Walaupun demikian, pada sumur X-1 ini telah dilakukan DST ( Drill Stem Test ), dimana terdapat indikasi kandungan gas dari hasil tes tersebut. Penelitian ini dilakukan dengan menggunakan Black Oil Simulator dengan fluida yang terdiri dari gas dan air. Adapun model dari reservoir ini berdimensi 32×280×94 sehingga totalnya ada sebanyak 842.240 grid cell . Berdasarkan perhitungan volumetrik, diketahui bahwa GIIP ( Gas Initial in Place ) dari Lapangan X adalah sebesar 20,02 BSCF. Sedangkan dari hasil inisialisasi data pada proses simulasi, didapat GIIP sebesar 20,8 BSCF. Perbedaan yang didapat dari kedua hasil perhitungan di atas adalah sebesar 3,896%. Mengingat lapangan ini belum berproduksi, maka proses history matching dilakukan dengan menggunakan data DST dari sumur X-1. Skenario produksi pada penelitian ini dilakukan selama 15 tahun melalui analisis sensitivitas pergantian nilai laju alir gas dan THP ( Tubing Head Pressure ), sehingga totalnya ada 12 skenario produksi. Berdasarkan hasil simulasi dengan memperhatikan plateau time , maka skenario produksi terbaik didapat pada pengaturan laju alir 2 MMSCF dengan RF ( Recovery Factor )  sebesar 54,7% dan plateau rate bertahan sampai akhir simulasi. Apabila hanya memperhatikan sampai sumur mati, maka skenario terbaik didapat pada pengaturan laju alir 8 MMSCF dan THP 100 psia , yaitu diperoleh RF sebesar 79,56%.  Kata Kunci : Simulasi reservoir, laju alir, tubing head pressure , plateau time , recovery factor ABSTRACT Field X is a new field and it consists of X-1 well as an exsisting well. This well has not been produced, so there is no production data from Field X. However, in this well has been carried out a DST (Drill Stem Test), which indicates the gas content of the test results. This research used Black Oil Simulator which the fluid consist of gas and water. The model of this reservoir has dimensions of 32 × 280 × 94, so there are a total of 842,240 grid cells. Based on volumetric calculations, it has known that the GIIP (Gas Initial in Place) from Field X is 20.02 BSCF. Meanwhile, from the results of initialization data is 20.8 BSCF, therefore the the difference obtained from the calculation is 3,896%. Considering that this field has not been produced, the history matching process was carried out using DST data from X-1 well. The production scenario in this study was carried out for 15 years through a sensitivity analysis of changes in the value of gas flow rate and THP (Tubing Head Pressure), so that there are a total of 12 production scenarios. Based on the simulation results regarding the plateau time, the best production scenario is obtained at a flow rate setting of 2 MMSCF with an RF (Recovery Factor) of 54.7% and the plateau rate lasts until the end of the simulation. If we just consider the production until the well is dead, the best scenario is obtained at the flow rate setting of 8 MMSCF and THP 100 psia, which is an RF of 79.56%. Keywords :Reservoir simulation, flow rate, tubing head pressure, plateau time, recovery factor

STUDI SIMULASI UNTUK PREDIKSI PRODUKSI GAS DI LAPANGAN X MELALUI SENSITIVITAS LAJU ALIR DAN TUBING HEAD PRESSURE