Open AccessCHARACTERIZING THERMAL MATURITY AND HYDROCARBON POTENTIAL OF SOURCE ROCK USING ROCK-EVAL 6 PYROLYSIS TECHNIQUE
Author(s) -
Benedict Oghenemaro Aduomahor,
Smart O Osarenogowu,
Onyekachi Ibezim
Publication year - 2020
Publication title -
international journal of engineering applied science and technology
Language(s) - English
Resource type - Journals
ISSN - 2455-2143
DOI - 10.33564/ijeast.2020.v04i11.094
Subject(s) - source rock , pyrolysis , maturity (psychological) , hydrocarbon , geology , petroleum engineering , mineralogy , chemistry , geomorphology , waste management , engineering , law , organic chemistry , structural basin , political science
Organic geochemical evaluation of source rock within a petroleum system is important considering its role as the source of hydrocarbon. Subsurface samples at depth of 2361m (outer shelf) and 2613m (lower slope) from Pologbene-1 Well located within the northern delta depobelt were analysed using Rock-Eval pyrolysis analytical technique. This technique involves the temperature programmed heating of samples in an inert environment. Inference was drawn from Rock-Eval geochemical parameters, which include S1, S2, TOC, and Tmax. Others are Hydrogen Index (HI), Oxygen Index (OI) and Production Index (PI). The results were compared with the inner shelf (1716m) and the upper slope (2595m) of the same well. Two geochemical models were established: HI/OI and HI/Tmax, for the outer shelf and upper slope source rock of Pologbene-1 Well. The two models were derived from HI values of 502 and 548, OI value of 14 and 15 and Tmas value of 429 C and 419C (outer and upper slope respectively). The model indicate that the samples are oil and gas prone, are type II source rock containing type II kerogen. S1, S2 and TOC values of 7.96mg/g, 328mg/g and 65.36wtpercentage for outer shelf and 7.51mg/g, 325mg/g, 59.37 percentage for upper slope respectively indicate good to excellent source capacity and high petroleum potential for Pologbene-1 Well. Keywords— Organic geochemical evaluation; source rock, depositional environment; kerogen type; Niger Delta Basin