Maturity
Assessment Of Natural Gas In
Liu, Quanyou1, Bernhard M.
Krooss2, Jinxing Dai1, Wenhui
Liu3, Ralf Littke4 (1) Research Institute of Petroleum
Exploration and Development, PetroChina, Beijing,
China (2) Lehrstuhl für Geologie, Geochemie und Lagerstätten des Erdöls und der Kohle, RWTH-Aachen, Aachen, Germany (3)
Exploration and Production Research Institute, SINOPEC, Beijing, China (4)
Technical University of Aachen (RWTH), D-52056 Aachen, Germany
In this context, the bulk ratio of CH4
/ N2 is examined here as potential
alternative geochemical parameter
for the assessment of gas sources and maturity and compared to other previously
used
methods of maturity assessment of natural gas. Open-system non-isothermal pyrolysis of the low-mature coal from Manjiaer
Sag,
equations
: Stage I : Ro
= 0.0014T + 0.109, r2 = 0.9931(Ro<0.6%); Stage II: Ro = 0.0067T -
1.5855, r2 = 0.9996(Ro>0.6%). A kinetic interpretation of
nitrogen and methane generation characteristics of humic
coal during laboratory pyrolysis indicates that the
bulk ratios of methane and nitrogen as thermal maturity parameter may be
applied to assess the maturity of gas-sources. Thus, the maturity of the source
rocks of natural gases in
AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California