Search Repository STTMIGAS Balikpapan

Analisa well logging merupakan analisa yang dilakukan untuk
memperoleh informasi mengenai karakteristik reservoir dan sifat-sifat fisik dari
formasi yang diteliti. Analisa well logging meliputi analisa petrofisika secara
kualitatif dan kuantitatif yang bertujuan untuk menemukan zona prospek pada
suatu sumur dengan menganalisa log sumur yang meliputi log gamma ray,
resistivitas, neutron dan densitas. Serta menentukan parameter-parameter fisis
reservoir seperti porositas, ketebalan reservoir, dan saturasi air berdasarkan data
log.
Dalam penelitian ini dilakukan analisa terhadap Sumur X yang merupakan
sumur eksplorasi yang terletak di laut natuna timur. Analisa yang dilakukan yakni
menentukan zona prospek hidrokarbon berdasarkan analisa terhadap data well
logging. Dan menghitung besarnya cadangan pada zona prospek pada sumur X.
Dari hasil analisa ditemukan 2 zona prospek berada pada kedalaman 600.5
601.5 meter dan 604 620 meter yakni dengan ketabalan masing-masing 16
meter, kemudian dari data log pada lapisan tersebut diketahui porositas rata-rata
zona 1 & 2 sebesar 19% dan 28% dan saturasi air rata-rata zona 1 & 2 sebesar
64% dan 61%. Dan berdasarkan analisa data hasil uji sumur didapatkan
parameter faktor volume formasi gas (Bg) sebesar 1.5827 x 10-2 dan Luas Area
Pengurasan (A) sebesar 7.40 acre. Sehingga berdasarkan perhitungan dengan
metode volumetrik diperoleh besarnya cadangan awal gas sumuran pada sumur
X sebesar 122.3 MMSCF

Well logging analysis is an analysis conducted to obtain information about
reservoir characteristics and physical properties of the formation under study.
Well logging analysis includes qualitative and quantitative petrophysical
analysis which purposes to find the prospect zone of a well by analyzing well
logs including gamma ray logs, resistivity, neutrons and density. And determine
the physical parameters of reservoir such as porosity, reservoir thickness, and
water saturation based on log.
In this research, an analysis is conducted on well X. Well X is an
exploration well located in the east of natuna sea. The analysis is to determine
the hydrocarbon prospect zone based on an analysis of well logging data. And
calculate the amount of reserve in the prospect zone at well X.
Based on the results of the analysis, it is known two prospect zone in the
depth of 600.5 601.5 meters and 604 620 meters with thicknes of each layer
are 1 and 16 meters, then from the log data in the layer is known porosity average
in zone 1 and 2 with a value of 19 and 28% and the average water saturation with
a value of 64 and 61%. Based on the data analysis of well test result, the gas
volume form factor factor (Bg) is 1.5827 x 10-2 and the Drainage Area (A) is
7.40 acres. Therefore, based on calculation with volumetric method, obtained the
amount of initial gas in place at well X is 122.3 MMSCF.