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ORGANO-GEOCHEMICAL ANALYSIS FOR EVALUATION OF HYDROCARBON SOURCE POTENTIAL IN K.G BASIN, EASTERN INDIA
Journal
83rd EAGE Conference and Exhibition 2022
Date Issued
2022-01-01
Author(s)
Niyolia, D.
Dutta, S.
Abstract
Bulk-organo-geochemical study has been carried out to understand the hydrocarbon source potential of Raghavapuram shale from KG basin. Detailed characterization of the samples were carried on the molecular level using two-dimensional gas chromatography time-of-flight mass spectrometry (GCXGC-TOFMS). The organic matter is a mixture of Type II and Type III kerogen with TOC content ranging from 6.5-11.8 wt.%. The Tmax range of the samples lies between 454-465°C indicating that the samples belong to the catagentic window. Moreover, the type of hydrocarbon generation is mostly gas-oil source to gas source zone. The biomarker assemblages of shale samples sequences largely include n-alkanes, sesquiterpenoids, diterpenoids, hopanoids and steranes. The n-alkanes extracted from Raghavapuram shale range from C14 to C36 with carbon preference index (CPI) ranging from 0.9 to 1.3. High abundance of C29 steranes over C27 and C28 indicate significant contribution of terrestrial higher plant input to the organic matter. The higher plant-derived terpenoids of Early Cretaceous shale sequence are characterized by the significant occurrence of diterpenoids including norisopimarane, entbeyerene, isopimarane, abietane, in the aliphatic fraction and bisnorsimonellite, simonellite, totarane, semipervirane, retene in the aromatic fraction. The efficiency of GCxGC manages to improve in better understanding on hydrocarbon generating potential in KG Basin.
Volume
5