Analisis Velocity Model dalam Proses Meminimalisasi Efek Pull-Up dan Perhitungan Original Oil In Place pada Lapangan “JAX”, Cekungan Offshore North West Java

Ibrahim, Muhammad Yusuf (2020) Analisis Velocity Model dalam Proses Meminimalisasi Efek Pull-Up dan Perhitungan Original Oil In Place pada Lapangan “JAX”, Cekungan Offshore North West Java. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Efek pull-up adalah kondisi terangkatnya suatu litologi pada pencitraan seismik akibat pengaruh perambatan gelombang seismik yang cepat melalui build-up karbonat di atasnya. Kondisi efek pull-up dapat menimbulkan kesalahan interpretasi, sehingga perlu di koreksi sampai diperoleh kondisi geologi yang aktual. Penelitian ini dilakukan di lapangan JAX di wilayah kerja PT Pertamina Hulu Energi ONWJ. Target reservoir penelitian ini adalah formasi Main-Massive (Upper Cibulakan) di bawah karbonat formasi Parigi. Reflektor target reservoir muncul efek pull-up dalam data seismik domain waktu. Maka dibutuhkan velocity model untuk koreksi anomali kecepatan untuk mengurangi uncertainty pada peta struktur dan perhitungan original oil in place. Metode koreksi efek pull-up dalam penelitian ini menggunakan tiga variasi velocity model; variasi structurally controlled model, variasi RMS velocity with well control, dan variasi calibrated RMS velocities model. Tiga variasi hasil velocity model dapat memperbaiki efek pull-up pada lapangan JAX. Velocity model dengan variasi RMS velocity with well control memiliki nilai error terendah dengan nilai 5,24 meter dari perbedaan kedalaman dengan kedalaman aktual di sumur. Berdasarkan tiga velocity model, nilai original oil in place pada reservoir JAX-32 memiliki rentang 59,14 - 84,59 mmbo, sedangkan pada reservoir JAX-35A memiliki rentang 27,77 - 31, 23 mmbo. Nilai-nilai ini dapat dipertimbangkan dalam sensitivitas perhitungan cadangan.

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The pull-up effect is the condition of a lithology elevated in seismic imaging due to the effect of rapid seismic wave propagation through carbonate build-up on it. Pull-up effect conditions can lead to misinterpretation, so it needs to be corrected until the actual geological conditions are obtained. This research was conducted in the JAX-field in the working area of PT Pertamina Hulu Energi ONWJ. The target reservoirs of this study is in the Main-Massive (Upper Cibulakan) formation under the carbonate Parigi formation. Reflector of the target reservoirs appears pull-up effect in time domain seismic data. Building velocity model for velocity anomaly correction is needed to reduce uncertainty for structure maps and also oil in place calculation. The method of correcting the pull-up effect in this study uses three variations of the velocity model; variation structurally controlled model, variation RMS velocity with well control, and variation calibrated RMS velocities model. The three variations of the velocity model result can correct the pull up effect on JAX-Field. Velocity model with variation RMS velocity with well control has the lowest error with 5,24 metre average of depth different with actual depth from well. Based on three velocity models, the value of original oil in place on the JAX-32 reservoir surface has a range of 59,14 - 84,59 mmbo, while on the JAX-35A surface has a range of 27,77 - 31,23 mmbo. This values can be considered in reserves calculation sensitivity.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Efek Pull-Up, Velocity Model, Original Oil In Place
Subjects:	Q Science > QE Geology > QE538.5 Seismic tomography; Seismic waves. Elastic waves Q Science > QE Geology > QE539.2.S4 Seismic models
Divisions:	Faculty of Civil, Environmental, and Geo Engineering > Geophysics Engineering > 33201-(S1) Undergraduate Theses
Depositing User:	Muhammad Yusuf Ibrahim
Date Deposited:	10 Aug 2020 07:42
Last Modified:	10 Aug 2020 07:42
URI:	http://repository.its.ac.id/id/eprint/77243

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