Abstract
Pliocene age lignites from Lower Sajau seam, from borehole in Berau Basin, Northeast Kalimantan, Indonesia were investigated with respect to organic geochemistry by HPLC, GC and GC/MS. The analysis was conducted to drilling sequence of Kasai Coal Field, Berau Basin which has been applied to identify organic sources and maturity of organic matter. The result of normalized yields of the soluble organic matter (SOM) data indicates saturated and aromatic proportion of hydrocarbon are very low (under 10%), this was reflecting that lignite coal is still in immature stage. Moreover, biomarker hydrocarbon such as diterpenoids was not found from the sample that indicates absence of gymnosperm precursor in the paleo-peat. In contrast, there was great abundance of terpenoid biomarkers including lupane and oleanane showing domination of angiosperms indicate that angiosperm was dominated vegetation source. There also hopanoid biomarkers explaining acidic depositional environment in coal formation and microbes-affected conditions in peat formation process. Ratio of Tm/Ts shows paleomire where ratios value of Tm/Ts is in range of oxide condition.
Highlights
A geochemical research was conducted to a number of coal lignite samples from lower Sajau Formation in Berau Basin, northeastern Kalimantan in order to identify the biomarker presents as the indicator for paleoenvironmental assessment
These two parameters are important in coal quality evaluation, from these data, a coal depositional environment is established including the conditions and vegetations involved during depositional process which will be useful for future investigations into the evolutions of depositional environment from this interval
There are three stages in this research, beginning with coal sampling from Sajau Formation in Kasai area, evaluating the geochemical characteristics through laboratory test using HPLC, GC, and GC/MS methods, and making interpretations from laboratory result to determine the conditions of depositional environment the maturity assessment from all samples
Summary
A geochemical research was conducted to a number of coal lignite samples from lower Sajau Formation in Berau Basin, northeastern Kalimantan in order to identify the biomarker presents as the indicator for paleoenvironmental assessment. Several specific identified biomarkers have been used in maturity. How to cite this paper: Zahra, K.A., Hamdani, A.H. and Rosmalina, R.T. (2015) Paleoenvironmental Implications from Biomarker Investigations on the Pliocene Lower Sajau Lignite Seam in Kasai Area, Berau Basin, Northeast Kalimantan, Indonesia. These two parameters are important in coal quality evaluation, from these data, a coal depositional environment is established including the conditions and vegetations involved during depositional process which will be useful for future investigations into the evolutions of depositional environment from this interval
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