LUBIS, ANDRI YULIZAR (2015) PEMETAAN BAWAH PERMUKAAN DAN PERHITUNGAN CADANGAN RESERVOAR LAPISAN “A, F, R”, LAPANGAN “CHITRA”, FORMASI TALANGAKAR, CEKUNGAN SUNDA BERDASARKAN DATA LOG SUMUR. Other thesis, UPN "Veteran" Yogyakarta.
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Abstract
Penelitian ini dilakukan pada Lapisan “A, F, R”, Lapangan “CHITRA”, Formasi Talangakar, Cekungan Sunda yang dikelola oleh Oil Company China National Offshore Oil Company SES Ltd. (CNOOC SES Ltd.). Lapangan Chitra secara umum terletak di Laut Jawa dan berada di sebelah Timur Pulau Sumatera bagian Selatan dan sebelah Utara pulau Jawa bagian Barat. Studi pemetaan bawah permukaan dan perhitungan cadangan ini untuk mengetahui sebaran reservoar dan cadangan reservoar pada Lapisan “A, F, R” lapangan ‘CHITRA’. Formasi Talangakar terdapat pada Cekungan Sunda yang bertujuan untuk megidentifikasi pola pengendapan dan struktur geologi daerah telitian, menentukan pola penyebaran serervoar berdasarkan analisis data sumur, memetakan penyebaran reservoar yang mencakup peta- peta bawah permukaan, dan menghitung besarnya cadangan hidrokarbon yang terkandung di reservoar. Metode yang dilakukan dalam penelitian pemetaan reservoar dan perhitungan cadangan reservoar adalah deskriptif analisis, sedangkan metode yang digunakan dalam perhitungan cadangan adalah metode volumetric. Analisis data log (sumur Chitra 01, Chitra 02, Chitra 03, Chitra 05, Chitra A-08, Chitra AC-01, Chitra AC-3st, Chitra AC-06p, Chitra AC-08) meliputi interpretasi kualitatif dan intepretasi kuantitatif. Lapisan “A, F, R” merupakan reservoar yang disusun oleh litologi batupasir halus hingga sedang, serpih, batulempung dan batubara. Lingkungan pengendapan pada Lapisan “A, F, R” yaitu delta khususnya lower delta plain dengan fasies channel, sand flood, crevasse splays, levee dan floodplain. Dimana channel dicirikan dengan pola log gamma ray berupa cylindrical sampai bell-shapped yang tebal, sand flood dicirikan dengan pola log bell-shapped yang dekat dengan channel, crevasse splays dicirikan dengan pola log funnel shape, levee dicirikan dengan pola log bell-shapped yang tipis dan floodplain dicirikan dengan pola log irregular. Geometri batupasir Lapisan “A, F, R” Formasi Talangakar mengalami penipisan kandungan batupasir dari arah timur laut ke barat daya berdasarkan korelasi stratigrafi dan peta netsand. Dari hasil interpretasi log dan elan petrophysic, diperoleh kontak fluida (OWC) terdalam pada sumur Chitra AC-06p di kedalaman SSTVD 5575 feet. Berdasarkan analisis kuantitatif dan kualitatif Lapisan “A, F, R” memiliki kandungan fluida minyak. Berdasarkan hasil perhitungan cadangan menggunakan metode volumetric, pada Lapisan “A” nilai IOIP (Initial Oil in Place) sebesar 3.425,74 STB, pada Lapisan “F” nilai IOIP sebesar 7.522,15 STB dan pada Lapisan “R” nilai IOIP sebesar 11.082,93 STB. This research was conducted on a Layer A, F, R, CHITRA Field, Talangakar Formation, Sunda Basins run by Oil Company China National Offshore Oil Company SES Ltd. (CNOOC SES Ltd.). Chitra Field are generally located within the Java Sea and located to the East of the Island of Sumatra and the southern portion of the north western part of Java Island. Mapping study under surface and reserve this calculation to know to scatter reservoir reserves and reservoir in the Layer of “A, F, R” Chitra Field. There are Talangakar Formations in depressions Sunda which aims to identify and the pattern of the deposition of a geological structure in focus research study, regions determining the pattern of the spread of reservoir analysis of data, based on the wells mapped the spread of reservoir which includes maps subsurface and counting the size of the hydrocarbon reserves contained in the reservoir. A method that is performed in mapping research reservoir and by calculation reservoir reserves is descriptive of the analyses while the methodology that was used in the calculation of reserve is a method of volumetric. Data analysis logs (wells chitra 01, chitra 02, chitra 03 chitra 05, chitra A-08, chitra AC-01, chitra AC-3st, chitra AC-06p, chitra AC-08) covers qualitative and quantitative interpretation. A Layer of “A, F, R” is reservoir compiled by lithology fine sand to medium sand sandstone, shale, claystone and coal. A deposition on the environment “A, F, R” is delta especially lower delta plain with facies channel, sand flood, splays crevasse, levee and floodplain .Where channel characterized with a pattern of cylindrical log gamma ray bell-shapped until thick up-ward, sand flood characterized by a pattern of logs bell-shapped close to channel, crevasse splays characterized by a pattern of logs funnel-shapped, levee characterized by thin a pattern tof log bell-shapped, floodplain characterized by a thin and log irregular pattern. A sandstone layer of geometry “A, F, R” Talangakar Formation experienced depletion of the sandstone formations from the northeast to southwest based on netsand map and stratigraphical correlation. From the interpretation of the log and elan petrophysic anlaysis, obtained contact fluid (OWC) in the deepest Chitras well AC-06p SSTVD 5575 feet. Based on analysis of quantitative and qualitative that Layer “A, F, R” has any fluid oil .Based on the calculation of reserve using a method of volumetric, in the Layer “A” value of IOIP (Initial Oil in Place) is 3.425,74 STB, in the Layer “F” value of IOIP is 7.522,15 STB and on the Layer “R” value of IOIP is 11.082,93 STB.
| Item Type: | Thesis (Other) |
|---|---|
| Subjects: | Q Science > QE Geology |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Eko Suprapti |
| Date Deposited: | 26 May 2016 03:02 |
| Last Modified: | 26 May 2016 03:02 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/2517 |
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