Perhitungan dan Analisa Petrofisik Lapangan Betung, Formasi Air Benakat, Sub-Cekungan Jambi-Cekungan Sumatera Selatan

Aisyah Indah Irmaya, Basuki Rahmad, Deddy Kristanto, Aris Buntoro

Abstract


Potensi Sub-Cekungan Jambi cukup besar dalam menghasilkan hidrokarbon, dimana rasio kesuksesan yang dicapai sebesar 51% tapi belum dilakukan eksplorasi secara maksimal [9]. Salah satu strategi untuk meningkatkan produksi hidrokarbon dari lapangan migas yang sudah diproduksikan adalah dengan melakukan analisa petrofisik untuk penambahan sumur-sumur pengembangan. Penelitian difokuskan pada L-5 Formasi Air Benakat dimana potensi cadangannya masih cukup besar dengan OOIP L-5 pada tahun 2017 sebesar 16,531.05 MSTB. Metode dalam penelitian ini adalah dengan pengumpulan data primer yaitu data-data log sumur log yaitu Gamma Ray log, Resistivity log, Density dan Neutron log. Data sekunder yaitu literatur, laporan sumur. Menggunakan Petrel Petrophysic, data-data tersebut diolah untuk mendapatkan nilai kandungan lempung, saturasi air, porositas dan permeabilitasnya. Berdasarkan perhitungan dan Analisa petrofisik lapangan Betung, Formasi Air Benakat, Sub-Cekungan Jambi-Cekungan Sumatera Selatan: Sumur-sumur L-5 (AI-209; AI-210; AI-211; AI-222) memiliki nilai porositas dengan range 23% - 31 %, termasuk kategori sangat baik – istimewa [8]. Sumur-sumur L-5 (AI-209; AI-210; AI-211; AI-222) memiliki tingkat permeabilitas dengan range 130 – 229 mD, termasuk kategori baik sekali (Koesoemadinata, 1978). Nilai penggal diperoleh nilai kandungan lempung maksimal 32%, nilai kandungan porositas minimal 13% serta nilai kandungan saturasi air maksimal 50%.

 

The potential of the Jambi Sub-Basin is quite large in producing hydrocarbons, where the success ratio achieved is 51% but exploration has not been carried out optimally [9]. One strategy to increase the production of hydrocarbons from oil and gas fields that have already been produced is to conduct petrophysical analysis for the addition of development wells. The research is focused on the L-5 of the Air Benakat Formation where the potential reserves are still quite large with an OOIP of L-5 in 2017 of 16,531.05 MSTB. The method in this research is to collect primary data, namely well log data, namely Gamma Ray logs, Resistivity logs, Density logs and Neutron logs. Secondary data are literature, well reports. Using Petrel Petrophysics, the data is processed to get the value of clay content, water saturation, porosity and permeability. Based on calculations and petrophysical analysis of the Betung field, Air Benakat Formation, Jambi-South Sumatra Basin: Wells L-5 (AI-209; AI-210; AI-211; AI-222) have porosity values with a range of 23 % - 31%, including very good category - special [8]. The L-5 wells (AI-209; AI-210; AI-211; AI-222) have a permeability level in the range of 130 – 229 mD, including the very good category (Koesoemadinata, 1978). The cutoff value obtained is a maximum clay content of 32%, a minimum porosity value of 13% and a maximum water saturation value of 50%.

 


Keywords


Formasi Air Benakat; Well log; Petrofisik

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References


Asquith, G 1982. Basic Well Log Analysis for Geologists. AAPG, TulsaOklahoma.

De Coster, G. L., 1974, Central and South Sumatra Basins .The Geology of The Proceedings Indonesian Petroleum Association, Third Annual Convention, June 1974, 77- 110.

Crain, E.R. 2015. Crain’s Petrophysical Pocket Pal. www.Spec2000.net (diakses 10 Agustus 2017)

Geological Society Memoir No.31, 2005. Sumatera: Geology, Resoursces and Tectonics Evolution. The Geological Society, London

Ginger, D dan Fielding, K. 2005, The Petroleum and Future Potential of The South Sumatra Basin. Indonesian Petroleum Assocoation

Glover, Paul. 2007. Petrophysics MSc Course Notes. Nottingham, United Kingdom

Harsono, A. 1997. Evaluasi Formasi dan Aplikasi Log Edisi-8. Jakarta; Schlumberger Oil Field Services.

Koesoemadinata, R.P. 1978. Geologi Minyak Bumi. Bandung. Penerbit ITB.

Mizani, Y.A., 2011, Characterization of Hydrocarbon and Source Rock in Berembang-Karangmakmur Deep Jambi Sub Basin, AAPG International Conference and Exhibition, Milan, Italy, pp. 156- 174.

Nukefi, Alvey. 2007. Karakterisasi Reservoir dan Perhitungan Volumetrik Cadangan Hidrokarbon pada Reservoir “A”, Lapangan Dalmatian, Cekungan Natuna Barat. Bandung: Institut Teknologi Bandung.

Pulunggono A, Cameron N.R, 1984. Sumatran Microplates, Their Characteristics and Their Role in the Evolution of the Central and South Sumatra Basin. Proc.13th Ann.Conv.IPA, Jakarta, p 121 -143.

Rider, M. 1996. The Geological Interpretation of Well Logs 2nd Edition. Interprint Ltd. Malta

Juhasz, I., 1986. Assesment of the Distributions of Shale, Porosity and Hydrocarbon Saturation in Shaly Sands. 10th Annual European Formation Evaluation Symposium, Paper AA

Thomas, E.C., Stieber, S.J., 1975. The Distribution of Shale in Sandstones and its Effect upon Porosity. Society of Petrophysicists and Well-Log Analysts (SPWLA) 16th Annual Logging Symposium Tranactions, Paper T.




DOI: https://doi.org/10.31284/j.semitan.j.2022.v1i1.4986

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