Open AccessIdentification of coal layer using gravity method in Lam Apeng Aceh Besar
Author(s) -
Dian Darisma,
Lutfi Hakim,
Marwan Marwan
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1087/1/012071
Subject(s) - geology , specific gravity , coal , residual , alluvium , layer (electronics) , mineralogy , gravity anomaly , geotechnical engineering , geomorphology , materials science , mathematics , composite material , geography , petroleum engineering , archaeology , algorithm , oil field
Aceh has a coal potential of around 450 million tonnes. One of the areas identified as having coal potential is Lam Apeng, Aceh Besar. In this study, the gravity method is used to model coal layers that are different from other layers based on rock density. The data used are 99 points with a space of 50 m and a coverage area of 450×450 m. From the results of the data corrected to become a complete anomaly Bouger (CBA), it was obtained a trend with a higher gravity value towards the northeast and the lower towards the southwest of the study area. CBA data are filtered using the moving average technique to obtain regional anomalies (associated with deep structures) and residual anomalies (associated with shallow structures). Regional anomalies and residual anomalies also show the same trend as CBA. Based on the 2D modeling results of the L-L ‘section, there are three different rock layers, namely alluvium layer with density 2 gr/cm 3 , sandy tuff layer with density 2.3 gr/cm 3 , and coal layer. There are three coal layers with different density values, namely layer A with density 1.68 gr/cm 3 , slope 125° and layer thickness 2-4 m; layer B with density 1.71 gr/cm 3 , slope ± 120°, and layer thickness 7-8 m; and layer C with density 1.7 gr/cm 3 , slope ± 120°, and thickness 4-6 m.