Potensi Shale Hydrocarcon Formasi Brown Shale, Cekungan Sumatra Tengah Berdasarkan Data Log Mekanik
DOI:
https://doi.org/10.30588/jo.v2i1.356Keywords:
formasi brown shale, metoda passey, batuan induk migas, shale hydrocarbon, brown shale formation, passey method, oil and gas parent rockAbstract
Formasi Brown Shale merupakan batuan induk utama hidrokarbon di Cekungan Sumatra Tengah. Penelitian ini bertujuan mengevaluasi potensi formasi tersebut sebagai batuan induk hidrokarbon dan implikasinya dalam eksplorasi shale hydrocarbon berdasarkan data wireline log. Evaluasi yang dilakukan meliputi penentuan ona prospek (shale play), evaluasi kandungan material organik (TOC) untuk mengetahui tingkat kekayaan batuan induk dan evaluasi tingkat kematangannya. Tiga sumur, Sumur Gamma, Jeta dan Kilo dievaluasi dengan menggunakan Metoda Passey (1990) dan Bowman (2010) . Log Gamma Ray, Resistivitas, Sonic, Netron dan Densitas digunakan dalam studi ini.Dari hasil analisis menunjukkan Formasi Brown Shale yang tertembus oleh ketiga sumur tersebut tersusun oleh perselingan batulempung dan batulanau yang mengindikasikan mempunyai prospek sebagai batuan induk dengan tingkat kekayaan material organik miskin sampai kaya dan telah mencapai tingkat kematangan hidrokarbon. Kandungan TOC pada Sumur Gamma berkisar antara 2-8%(kaya) dan tingkat kematangan minyak dicapai pada kedalaman 6550 ft. Kandungan TOC pada Sumur Jeta berkisar antara 0-7%(miskin-kaya) dan tingkat kematangan minyak dicapai pada kedalaman 8550 ft. Kandungan TOC pada Sumur Kilo berkisar antara 0-9%(miskin-kaya) dan tingkat kematangan minyak dicapai pada kedalaman 8100 ft.Berdasarkan hasil tersebut menunjukkan Formasi Brown Shale yang tertembus oleh ketiga sumur di daerah telitian mempunyai potensi yang baik sebagai batuan induk hidrokarbon dan shale hidrokarbon.
The Brown Shale Formation is the main hydrocarbon sourcerock in the Central Sumatra Basin. This study aims to evaluate the potential of these formations as hydrocarbon bedrock and their implications in shale hydrocarbon exploration based on wireline log data. The evaluation includes determining the prospect of shale play, evaluating the total organic content (TOC) to determine the level of source rock wealth and evaluating its level of maturity. Three wells, Gamma Well, Jeta and Kilo were evaluated using the Passey (1990) and Bowman (2010) method. Gamma Ray, Resistivity, Sonic, Neutron and Density logs were used in this study. From the results of the analysis showed that the Brown Shale Formation penetrated by the three wells was composed by claystone and siltstone intervals which indicated having prospects as a source rock with poor organic to rich material levels. and has reached the level of hydrocarbon maturity. The TOC content in the Gamma Well ranges from 2-8% (rich) and the level of oil maturity is reached at a depth of 6550 ft. The TOC content in the Jeta Well ranges from 0-7% (poor-rich) and the level of oil maturity is reached at a depth of 8550 ft. The TOC content in the Kilo Well ranges from 0-9% (poor-rich) and the level of oil maturity is reached at a depth of 8100 ft. Based on these results shows the Brown Shale Formation penetrated by the three wells in the study area has good potential as a hydrocarbon host rock and hydrocarbon shale.
References
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