GENESIS DAN KARAKTERISASI GEOKIMIA DI LAPANGAN SUBAN, CEKUNGAN SUMATERA SELATAN
There has been a strength of growth of gas reserves in Indonesia which will cause a continued shift from oil to gas production as mature oil fields are depleted. Exploration efforts during the last ten years have been awarded by discoveries of significant and large to giant gas fields distribu...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/16495 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | There has been a strength of growth of gas reserves in Indonesia which will cause
a continued shift from oil to gas production as mature oil fields are depleted.
Exploration efforts during the last ten years have been awarded by discoveries of
significant and large to giant gas fields distributed all over Indonesia.
Therefore, a knowledge of the origin, distribution, and habitat of natural gases are
important for focusing gas exploration. Regional knowledge of gas geochemistry
will result in more efficient gas exploration strategy.
Rock samples analyzed in the well SBU-1 shows that the total organic carbon
content (TOC) ranges from low to sufficient potential. Telisa Formation has TOC
values ranging between 0.75 and 1.22%, Formation (equivalent) Baturaja between
0.44 and 1.36% while Talangakar Formation ranges from 1.23 and 1.66%.
The results of the Rock-Eval data plot on the modification van Krevelen diagram
shows that the majority of the analyzed rock sample is Type III kerogen (gas
prone). Interpretation of maturity indicates that the level of early maturity occurs
at a depth of 2600 m and begin to produce hydrocarbons below this depth.
Analysis of gas composition in detail has been carried out on 7 (seven) gas
samples taken from wells Durian Mabok-2, Suban-3, Suban-4, Suban-5, Suban-6,
Suban-7, Suban-9, SBB-1 , SBB-2 and SBU-1. The composition of these gases
are generally similar and dominated by the hydrocarbon components with a value
of between 84.56% mole and 98.13% mole. Gas methane (CH4) is the most
abundant component with values between 75.98% mole and 89.83% mole while
the content of the wet gas (C2-C5) is quite high (5.88 to 22.57%), indicating that
the pure gases are thermogenic on the first possibility.
Cross-plot method of methane ?13CCH4 geochemistry of hydrocarbon formation
indicates that gas in the Field Suban divided into two types of gas and
vi
thermogenic gas is biogenic gas. This was confirmed by the results of cross-plot
?13CCH4 against the concentration of C2+ which shows that in the research area
there are two different types of gas origin.
The composition of stable carbon isotopes of CO2 components found in the
research area indicates that the value varies between -0.28% and -14.15%. The
results of the cross-plot shows that the CO2 comes from two sources include
mantle activity or volcanic and biogenetic sources. |
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