IDENTIFIKASI POLA SEBARAN BATUBARA
MENGGUNAKAN METODE WELL LOGGING
BERDASARKAN DATA LOG GAMMA RAY DAN
LOG DENSITY DI AREA X PT PMC SITE SUNGAI LILIN
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Institusion
Universitas Jambi
Author
Kesumah, Muhammad Puja Prana
Subject
L Education (General)
Datestamp
2023-10-10 07:05:59
Abstract :
Secara fisiografis daerah penelitian termasuk dalam Cekungan Sumatera Selatan, tepatnya pada Formasi Muara Enim Formasi pembawa batubara. Pada penelitian ini digunakan data sekunder berupa data LAS file hasil perekaman data well logging sebanyak 7 sumur yang kemudia dioalah menggunakan software WellCAD 5.5 untuk mendapatkan hasil lembar log yaitu log gamma ray dan log densitas yang kemudian dinterpretasi litologi bawah permukaan dengan membaca defleksi kurva log, dari hasil pembacaan kurva log didapatkan litologi pada daerah peneltian berupa batulempung, batulanau, batu lempung karbonan, dan batubara. Batubara memilki ciri dengan respon log gamma ray yang rendah (<10 CPS) dan respon log densitas yang tinggi (>900 CPS). Untuk menetuka persebaran seam batubara pada daerah penelitian dilakukan korelasi struktur dan korelasi startigrafi pada seam batubara onstrike (barat laut-tenggara) dan cross strike (barat daya ? timur laut) didaptakan 1 seam batubara yaitu seam A. Seam A mengalami splitting menjadi seam A1 dan seam A2 dikarenakan adanya pengaruh struktur. Dari hasil korelasi didapatkan kemenrusan batubara kearah barat daya ? timur laut dengan mengalami penebalan dan penipisan lapisan. Physiographically, the research area is included in the South Sumatra Basin, precisely in the Muara Enim Formation, a coal-bearing formation. In this study, secondary data is used in the form of LAS file data from recording well logging data as many as 7 wells which are then processed using WellCAD 5.5 software to obtain log sheet results, namely gamma ray logs and density logs which are then interpreted for subsurface lithology by reading the log curve deflection, from the results of reading the log curve, the lithology in the research area is obtained in the form of claystone, siltstone, carbonaceous claystone, and coal. Coal is characterized by low gamma ray log response (<10 CPS) and high density log response (>900 CPS). To determine the distribution of coal seams in the study area, structural correlation and startigraphic correlation of coal seams onstrike (northwest - southeast) and cross strike (southwest - northeast) were found to be 1 coal seam, namely seam A. Seam A experienced splitting into seam A1 and seam A2 due to structural influence. From the correlation results, it is found that the coal slope is towards the southwest - northeast by experiencing thickening and thinning layers.
Secara fisiografis daerah penelitian termasuk dalam Cekungan Sumatera Selatan, tepatnya pada Formasi Muara Enim Formasi pembawa batubara. Pada penelitian ini digunakan data sekunder berupa data LAS file hasil perekaman data well logging sebanyak 7 sumur yang kemudia dioalah menggunakan software WellCAD 5.5 untuk mendapatkan hasil lembar log yaitu log gamma ray dan log densitas yang kemudian dinterpretasi litologi bawah permukaan dengan membaca defleksi kurva log, dari hasil pembacaan kurva log didapatkan litologi pada daerah peneltian berupa batulempung, batulanau, batu lempung karbonan, dan batubara. Batubara memilki ciri dengan respon log gamma ray yang rendah (<10 CPS) dan respon log densitas yang tinggi (>900 CPS). Untuk menetuka persebaran seam batubara pada daerah penelitian dilakukan korelasi struktur dan korelasi startigrafi pada seam batubara onstrike (barat laut-tenggara) dan cross strike (barat daya ? timur laut) didaptakan 1 seam batubara yaitu seam A. Seam A mengalami splitting menjadi seam A1 dan seam A2 dikarenakan adanya pengaruh struktur. Dari hasil korelasi didapatkan kemenrusan batubara kearah barat daya ? timur laut dengan mengalami penebalan dan penipisan lapisan. Physiographically, the research area is included in the South Sumatra Basin, precisely in the Muara Enim Formation, a coal-bearing formation. In this study, secondary data is used in the form of LAS file data from recording well logging data as many as 7 wells which are then processed using WellCAD 5.5 software to obtain log sheet results, namely gamma ray logs and density logs which are then interpreted for subsurface lithology by reading the log curve deflection, from the results of reading the log curve, the lithology in the research area is obtained in the form of claystone, siltstone, carbonaceous claystone, and coal. Coal is characterized by low gamma ray log response (<10 CPS) and high density log response (>900 CPS). To determine the distribution of coal seams in the study area, structural correlation and startigraphic correlation of coal seams onstrike (northwest - southeast) and cross strike (southwest - northeast) were found to be 1 coal seam, namely seam A. Seam A experienced splitting into seam A1 and seam A2 due to structural influence. From the correlation results, it is found that the coal slope is towards the southwest - northeast by experiencing thickening and thinning layers.
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