Thermal Maturation of Solid Bitumen in Shale as Revealed by Raman Spectroscopy
Received date: 2015-04-26
Revised date: 2015-05-22
Online published: 2015-09-10
The Lower Paleozoic shale from the South China region has very high maturity and is lack of vitrinite.Although solid bitumen usually occurs in shale,its measuring reflectance value varies widely,thus there is a big challenge to determine the exact maturity of the shale,which puzzles the conventional and unconventional petroleum exploration conducted in this area for many years.In this study,the Raman spectroscopic characteristics of solid bitumen in shale samples taken from the Yangtze region with different maturities(BRO =0.43%-5.51%)were investigated.The results indicate that the Raman spectral parameters of the solid bitumen,including band position(WD and WG),band separation(RBS),full width at half maximum(FWHM-D and FWHM-G),and band intensity ratio (ID/IG) are all related to the bitumen reflectance,but with considerably different correlations,constrained apparently by maturity.Linear regressions were performed between these parameters and bitumen reflectance,and some parameters with higher correlation were selected.They are RBS(within 1.5%-3.5% of BROand ID/IG (with BRO>3.5%),showing a correlation coefficient as high as 0.95.It is believed that the two Raman spectral parameters of solid bitumen will be of significant practical use for the maturity assessment of the Lower Paleozoic shale when standard measurement and curve fitting procedures are utilized.
WANG Mao-lin，XIAO Xian-ming，WEI Qiang，ZHOU Qin . Thermal Maturation of Solid Bitumen in Shale as Revealed by Raman Spectroscopy[J]. Natural Gas Geoscience, 2015 , 26(9) : 1712 -1718 . DOI: 10.11764/j.issn.1672-1926.2015.09.1712
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