PETROPHYSICAL ANALYSIS OF COAL GAS METHANE CALCULATION IN THE "ALPHA" FIELD, MUARA ENIM FORMATION, SOUTH SUMATERA BASIN
Coal gas methane or better known as Coal Bed Methane (CBM) is currently one of the alternative energy that are designated to reduce oil and gas consumption nationally. The advantage of taking this energy is its environmentally friendly behaviour. This study was conducted to determine the gas co...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/78488 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Coal gas methane or better known as Coal Bed Methane (CBM) is currently one of the
alternative energy that are designated to reduce oil and gas consumption nationally. The
advantage of taking this energy is its environmentally friendly behaviour.
This study was conducted to determine the gas content in coal, that are produced from two
types data, such as surface data (coal sample) and gas calculations which generated from
well logs. The research areas ("Alpha" Field) is located in the Sub-Basin of the South
Palembang, South Sumatera Basin.
Based on electrofacies analysis, coal in the research area is generally deposited in the deltaic
environment. In order to get the coal seams beneath the surface, petrophysical parameters
such as density values (RHOB) less than or equal to 1.4 g / cc, is used. In addition, other
values used is gamma ray parameter with a value between 90-120 API. Types of coal can be
determined by plotting the value of density (RHOB), neutron porosity (NPHI), and sonic
(DT). Gas content is calculated by using Kim Formula that is performed for surface data and
data from well log analysis.
Based on chart NPHI vs RHOB and RHOB vs DT, coal in the study area is divided into two
types, they are sub-bituminous and bituminous. Coal matrix density value that be used in
calculating gas content is about 1.26 to 1.29 g / cc (generated from the average RHAMACA
value). The results of the comparison showed that the gas content from the petrophysical
analysis is greater than that calculated from the surface data. The petrophysical analysis result
Erry Hafriandy 22009019 iv
value of gas produced at 140-160 SCF / Ton, while laboratory analysis data produced gas
value of 73-91 SCF / Ton. |
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