#TITLE_ALTERNATIVE#

• Main Author: HERIYANTO (NIM 22000025); Pembimbing: Dr.Ir. Eddy A. Subroto dan Imam B. Sosrowidjojo, Ph.D., NANDANG
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/16649
• Institution: Institut Teknologi Bandung

Some laboratory samples collected from the Jambi sub-basin, which include samples from the data set-1 (the 2001 study), and the data set-2 (another data set provided from previous study), and some samples taken from outside of the Jambi area, have been used. The data set covers some 63 sediment samples and 55 oils samples. Re-evaluation and validation were conducted on the data sets to obtain a high quality of data, mainly for the data availability of biomarkers. Analysis and an integration evaluation of the biomarkers and carbon isotopes were applied on those available data sets using international petroleum geochemistry standard (Peters & Moldowan, 1993). The results have been integrated into the geological aspects related to the sub-basin. <br /> <br /> <br /> <br /> Organo-facies attribute for oils and condensate taken from the Jambi area are dominantly derived from aquatic environment, whereas the type I-II were found in major amount. The hydrocarbon composition in the area are controlled by 4 phenomenon involving (i) original character of source input and depositional environment, (ii) thermal maturity of source rock coincide the expulsion time, (iii) the geochromatography processes, and (iv) the biodegradation processes within the reservoir rock. Organo-facies derived from allochthonous materials attributed as higher plants are observed in particular samples with some variation of concentration. Correlation study suggested that the hydrocarbon in the area originated from the organosediment of Gumai and Talangakar (TRM) shales, which is finally considered as a major source rock that charge the area. Considering the available data and corresponding the composition of its organo-facies, the oils and condensate within the Jambi area are suggestive to be classified into 4 major groups: group-2, group-3, group-4 and group-S. <br /> <br /> <br /> <br /> Two migration scenarios, hypothetically, have been illustrated in this study. The SW - NE and SE - NW migration directions are designated as a major migration direction from source pods to trap. Inline to the early hypothesis, there are 5 potential source pods in the area, i.e.: Berembang deep, Bajubang-Betung deep, Tempino-Kenaliasam deep, Geragai deep, and Ketaling deep. Bajubang-Betung deep (central graben area) suggested being the most prolific source pod. A secondary migration phenomenon from the younger to the older strata, is suggested as determinant factor of correlative organo-facies attribute between the RCD and the organosediment within the Bajubang -Betung deep. A reasonable pathway to describe this phenomenon is a NW fault trend which is supported by exitence of reservoir pressure difference.